Arrays (SunSPOT API V3.0)

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com.sun.squawk.util
Class Arrays

java.lang.Object
  com.sun.squawk.util.Arrays

public class Arrays
extends Object
extends Object

This class contains various methods for manipulating arrays (such as sorting and searching). This class also contains a static factory that allows arrays to be viewed as lists.

The methods in this class all throw a NullPointerException if the specified array reference is null.

The documentation for the methods contained in this class includes briefs description of the implementations. Such descriptions should be regarded as implementation notes, rather than parts of the specification. Implementors should feel free to substitute other algorithms, so long as the specification itself is adhered to. (For example, the algorithm used by sort(Object[]) does not have to be a mergesort, but it does have to be stable.)

Since:: 1.2
Version:: 1.45, 02/12/02
Author:: Josh Bloch
See Also:: Comparable, Comparer

Method Summary
`static int`	`binarySearch(byte[] a, byte key)` Searches the specified array of bytes for the specified value using the binary search algorithm.
`static int`	`binarySearch(char[] a, char key)` Searches the specified array of chars for the specified value using the binary search algorithm.
`static int`	`binarySearch(double[] a, double key)` Searches the specified array of doubles for the specified value using the binary search algorithm.
`static int`	`binarySearch(float[] a, float key)` Searches the specified array of floats for the specified value using the binary search algorithm.
`static int`	`binarySearch(int[] a, int key)` Searches the specified array of ints for the specified value using the binary search algorithm.
`static int`	`binarySearch(long[] a, long key)` Searches the specified array of longs for the specified value using the binary search algorithm.
`static int`	`binarySearch(Object[] a, Object key, Comparer c)` Searches the specified array for the specified object using the binary search algorithm.
`static int`	`binarySearch(short[] a, short key)` Searches the specified array of shorts for the specified value using the binary search algorithm.
`static boolean[]`	`copy(boolean[] src, int srcPos, int destLength, int destPos, int length)` Make a new boolean array and initialize its contents from the contents of a specified boolean array.
`static byte[]`	`copy(byte[] src, int srcPos, int destLength, int destPos, int length)` Make a new byte array and initialize its contents from the contents of a specified byte array.
`static char[]`	`copy(char[] src, int srcPos, int destLength, int destPos, int length)` Make a new char array and initialize its contents from the contents of a specified char array.
`static double[]`	`copy(double[] src, int srcPos, int destLength, int destPos, int length)` Make a new double array and initialize its contents from the contents of a specified double array.
`static float[]`	`copy(float[] src, int srcPos, int destLength, int destPos, int length)` Make a new float array and initialize its contents from the contents of a specified float array.
`static int[]`	`copy(int[] src, int srcPos, int destLength, int destPos, int length)` Make a new int array and initialize its contents from the contents of a specified int array.
`static long[]`	`copy(long[] src, int srcPos, int destLength, int destPos, int length)` Make a new long array and initialize its contents from the contents of a specified long array.
`static Object[]`	`copy(Object[] src, int srcPos, Object[] dest, int destPos, int length)` Make a new Object array and initialize its contents from the contents of a specified Object array.
`static short[]`	`copy(short[] src, int srcPos, int destLength, int destPos, int length)` Make a new short array and initialize its contents from the contents of a specified short array.
`static boolean`	`equals(boolean[] a, boolean[] a2)` Returns `true` if the two specified arrays of booleans are equal to one another.
`static boolean`	`equals(byte[] a, byte[] a2)` Returns `true` if the two specified arrays of bytes are equal to one another.
`static boolean`	`equals(char[] a, char[] a2)` Returns `true` if the two specified arrays of chars are equal to one another.
`static boolean`	`equals(double[] a, double[] a2)` Returns `true` if the two specified arrays of doubles are equal to one another.
`static boolean`	`equals(float[] a, float[] a2)` Returns `true` if the two specified arrays of floats are equal to one another.
`static boolean`	`equals(int[] a, int[] a2)` Returns `true` if the two specified arrays of ints are equal to one another.
`static boolean`	`equals(long[] a, long[] a2)` Returns `true` if the two specified arrays of longs are equal to one another.
`static boolean`	`equals(Object[] a, Object[] a2)` Returns `true` if the two specified arrays of Objects are equal to one another.
`static boolean`	`equals(Object a, Object b)` Returns `true` if the two specified Objects are equal to one another.
`static boolean`	`equals(short[] a, short[] a2)` Returns `true` if the two specified arrays of shorts are equal to one another.
`static void`	`fill(boolean[] a, boolean val)` Assigns the specified boolean value to each element of the specified array of booleans.
`static void`	`fill(boolean[] a, int fromIndex, int toIndex, boolean val)` Assigns the specified boolean value to each element of the specified range of the specified array of booleans.
`static void`	`fill(byte[] a, byte val)` Assigns the specified byte value to each element of the specified array of bytes.
`static void`	`fill(byte[] a, int fromIndex, int toIndex, byte val)` Assigns the specified byte value to each element of the specified range of the specified array of bytes.
`static void`	`fill(char[] a, char val)` Assigns the specified char value to each element of the specified array of chars.
`static void`	`fill(char[] a, int fromIndex, int toIndex, char val)` Assigns the specified char value to each element of the specified range of the specified array of chars.
`static void`	`fill(double[] a, double val)` Assigns the specified double value to each element of the specified array of doubles.
`static void`	`fill(double[] a, int fromIndex, int toIndex, double val)` Assigns the specified double value to each element of the specified range of the specified array of doubles.
`static void`	`fill(float[] a, float val)` Assigns the specified float value to each element of the specified array of floats.
`static void`	`fill(float[] a, int fromIndex, int toIndex, float val)` Assigns the specified float value to each element of the specified range of the specified array of floats.
`static void`	`fill(int[] a, int val)` Assigns the specified int value to each element of the specified array of ints.
`static void`	`fill(int[] a, int fromIndex, int toIndex, int val)` Assigns the specified int value to each element of the specified range of the specified array of ints.
`static void`	`fill(long[] a, int fromIndex, int toIndex, long val)` Assigns the specified long value to each element of the specified range of the specified array of longs.
`static void`	`fill(long[] a, long val)` Assigns the specified long value to each element of the specified array of longs.
`static void`	`fill(Object[] a, int fromIndex, int toIndex, Object val)` Assigns the specified Object reference to each element of the specified range of the specified array of Objects.
`static void`	`fill(Object[] a, Object val)` Assigns the specified Object reference to each element of the specified array of Objects.
`static void`	`fill(short[] a, int fromIndex, int toIndex, short val)` Assigns the specified short value to each element of the specified range of the specified array of shorts.
`static void`	`fill(short[] a, short val)` Assigns the specified short value to each element of the specified array of shorts.
`static int`	`hashCode(Object object)` Returns a hashcode for a given object.
`static int`	`length(Object array)` Returns the length of the specified array object, as an int.
`static void`	`sort(byte[] a)` Sorts the specified array of bytes into ascending numerical order.
`static void`	`sort(byte[] a, int fromIndex, int toIndex)` Sorts the specified range of the specified array of bytes into ascending numerical order.
`static void`	`sort(char[] a)` Sorts the specified array of chars into ascending numerical order.
`static void`	`sort(char[] a, int fromIndex, int toIndex)` Sorts the specified range of the specified array of chars into ascending numerical order.
`static void`	`sort(double[] a)` Sorts the specified array of doubles into ascending numerical order.
`static void`	`sort(double[] a, int fromIndex, int toIndex)` Sorts the specified range of the specified array of doubles into ascending numerical order.
`static void`	`sort(float[] a)` Sorts the specified array of floats into ascending numerical order.
`static void`	`sort(float[] a, int fromIndex, int toIndex)` Sorts the specified range of the specified array of floats into ascending numerical order.
`static void`	`sort(int[] a)` Sorts the specified array of ints into ascending numerical order.
`static void`	`sort(int[] a, int fromIndex, int toIndex)` Sorts the specified range of the specified array of ints into ascending numerical order.
`static void`	`sort(long[] a)` Sorts the specified array of longs into ascending numerical order.
`static void`	`sort(long[] a, int fromIndex, int toIndex)` Sorts the specified range of the specified array of longs into ascending numerical order.
`static void`	`sort(Object[] a, Comparer c)` Sorts the specified array of objects according to the order induced by the specified Comparer.
`static void`	`sort(Object[] a, int fromIndex, int toIndex, Comparer c)` Sorts the specified range of the specified array of objects according to the order induced by the specified Comparer.
`static void`	`sort(short[] a)` Sorts the specified array of shorts into ascending numerical order.
`static void`	`sort(short[] a, int fromIndex, int toIndex)` Sorts the specified range of the specified array of shorts into ascending numerical order.

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

binarySearch

public static int binarySearch(byte[] a,
                               byte key)

Searches the specified array of bytes for the specified value using the binary search algorithm. The array must be sorted (as by the sort method, above) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found.

Parameters:: a - the array to be searched.; key - the value to be searched for.
Returns:: index of the search key, if it is contained in the list; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the list: the index of the first element greater than the key, or list.size(), if all elements in the list are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
See Also:: sort(byte[])

binarySearch

public static int binarySearch(char[] a,
                               char key)

Searches the specified array of chars for the specified value using the binary search algorithm. The array must be sorted (as by the sort method, above) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found.

Parameters:: a - the array to be searched.; key - the value to be searched for.
Returns:: index of the search key, if it is contained in the list; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the list: the index of the first element greater than the key, or list.size(), if all elements in the list are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
See Also:: sort(char[])

binarySearch

public static int binarySearch(double[] a,
                               double key)

Searches the specified array of doubles for the specified value using the binary search algorithm. The array must be sorted (as by the sort method, above) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found. This method considers all NaN values to be equivalent and equal.

Parameters:: a - the array to be searched.; key - the value to be searched for.
Returns:: index of the search key, if it is contained in the list; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the list: the index of the first element greater than the key, or list.size(), if all elements in the list are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
See Also:: sort(double[])

binarySearch

public static int binarySearch(float[] a,
                               float key)

Searches the specified array of floats for the specified value using the binary search algorithm. The array must be sorted (as by the sort method, above) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found. This method considers all NaN values to be equivalent and equal.

Parameters:: a - the array to be searched.; key - the value to be searched for.
Returns:: index of the search key, if it is contained in the list; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the list: the index of the first element greater than the key, or list.size(), if all elements in the list are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
See Also:: sort(float[])

binarySearch

public static int binarySearch(int[] a,
                               int key)

Searches the specified array of ints for the specified value using the binary search algorithm. The array must be sorted (as by the sort method, above) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found.

Parameters:: a - the array to be searched.; key - the value to be searched for.
Returns:: index of the search key, if it is contained in the list; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the list: the index of the first element greater than the key, or list.size(), if all elements in the list are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
See Also:: sort(int[])

binarySearch

public static int binarySearch(long[] a,
                               long key)

Searches the specified array of longs for the specified value using the binary search algorithm. The array must be sorted (as by the sort method, above) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found.

Parameters:: a - the array to be searched.; key - the value to be searched for.
Returns:: index of the search key, if it is contained in the list; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the list: the index of the first element greater than the key, or list.size(), if all elements in the list are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
See Also:: sort(long[])

binarySearch

public static int binarySearch(Object[] a,
                               Object key,
                               Comparer c)

Searches the specified array for the specified object using the binary search algorithm. The array must be sorted into ascending order according to the specified Comparer (as by the Sort(Object[], Comparer) method, above), prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements equal to the specified object, there is no guarantee which one will be found.

Parameters:: a - the array to be searched.; key - the value to be searched for.; c - the Comparer by which the array is ordered. A null value indicates that the elements' natural ordering should be used.
Returns:: index of the search key, if it is contained in the list; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the list: the index of the first element greater than the key, or list.size(), if all elements in the list are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
Throws:: ClassCastException - if the array contains elements that are not mutually comparable using the specified Comparer, or the search key in not mutually comparable with the elements of the array using this Comparer.
See Also:: Comparable, sort(Object[], Comparer)

binarySearch

public static int binarySearch(short[] a,
                               short key)

Searches the specified array of shorts for the specified value using the binary search algorithm. The array must be sorted (as by the sort method, above) prior to making this call. If it is not sorted, the results are undefined. If the array contains multiple elements with the specified value, there is no guarantee which one will be found.

Parameters:: a - the array to be searched.; key - the value to be searched for.
Returns:: index of the search key, if it is contained in the list; otherwise, (-(insertion point) - 1). The insertion point is defined as the point at which the key would be inserted into the list: the index of the first element greater than the key, or list.size(), if all elements in the list are less than the specified key. Note that this guarantees that the return value will be >= 0 if and only if the key is found.
See Also:: sort(short[])

copy

public static byte[] copy(byte[] src,
                          int srcPos,
                          int destLength,
                          int destPos,
                          int length)

Make a new byte array and initialize its contents from the contents of a specified byte array.

Parameters:: src - the source array.; srcPos - starting position in the source array.; destLength - the length of the array to be created.; destPos - starting position in the destination data.; length - the number of array elements to be copied.
Returns:: the initialized copy of src.
Throws:: IndexOutOfBoundsException - if copying would cause access of data outside array bounds.; ArrayStoreException - if an element in the src array could not be stored into the dest array because of a type mismatch.; NullPointerException - if either src or dest is null.

copy

public static char[] copy(char[] src,
                          int srcPos,
                          int destLength,
                          int destPos,
                          int length)

Make a new char array and initialize its contents from the contents of a specified char array.

Parameters:: src - the source array.; srcPos - starting position in the source array.; destLength - the length of the array to be created.; destPos - starting position in the destination data.; length - the number of array elements to be copied.
Returns:: the initialized copy of src.
Throws:: IndexOutOfBoundsException - if copying would cause access of data outside array bounds.; ArrayStoreException - if an element in the src array could not be stored into the dest array because of a type mismatch.; NullPointerException - if either src or dest is null.

copy

public static double[] copy(double[] src,
                            int srcPos,
                            int destLength,
                            int destPos,
                            int length)

Make a new double array and initialize its contents from the contents of a specified double array.

Parameters:: src - the source array.; srcPos - starting position in the source array.; destLength - the length of the array to be created.; destPos - starting position in the destination data.; length - the number of array elements to be copied.
Returns:: the initialized copy of src.
Throws:: IndexOutOfBoundsException - if copying would cause access of data outside array bounds.; ArrayStoreException - if an element in the src array could not be stored into the dest array because of a type mismatch.; NullPointerException - if either src or dest is null.

copy

public static float[] copy(float[] src,
                           int srcPos,
                           int destLength,
                           int destPos,
                           int length)

Make a new float array and initialize its contents from the contents of a specified float array.

Parameters:: src - the source array.; srcPos - starting position in the source array.; destLength - the length of the array to be created.; destPos - starting position in the destination data.; length - the number of array elements to be copied.
Returns:: the initialized copy of src.
Throws:: IndexOutOfBoundsException - if copying would cause access of data outside array bounds.; ArrayStoreException - if an element in the src array could not be stored into the dest array because of a type mismatch.; NullPointerException - if either src or dest is null.

copy

public static int[] copy(int[] src,
                         int srcPos,
                         int destLength,
                         int destPos,
                         int length)

Make a new int array and initialize its contents from the contents of a specified int array.

Parameters:: src - the source array.; srcPos - starting position in the source array.; destLength - the length of the array to be created.; destPos - starting position in the destination data.; length - the number of array elements to be copied.
Returns:: the initialized copy of src.
Throws:: IndexOutOfBoundsException - if copying would cause access of data outside array bounds.; ArrayStoreException - if an element in the src array could not be stored into the dest array because of a type mismatch.; NullPointerException - if either src or dest is null.

copy

public static long[] copy(long[] src,
                          int srcPos,
                          int destLength,
                          int destPos,
                          int length)

Make a new long array and initialize its contents from the contents of a specified long array.

Parameters:: src - the source array.; srcPos - starting position in the source array.; destLength - the length of the array to be created.; destPos - starting position in the destination data.; length - the number of array elements to be copied.
Returns:: the initialized copy of src.
Throws:: IndexOutOfBoundsException - if copying would cause access of data outside array bounds.; ArrayStoreException - if an element in the src array could not be stored into the dest array because of a type mismatch.; NullPointerException - if either src or dest is null.

copy

public static Object[] copy(Object[] src,
                            int srcPos,
                            Object[] dest,
                            int destPos,
                            int length)

Make a new Object array and initialize its contents from the contents of a specified Object array.

Parameters:: src - the source array.; srcPos - starting position in the source array.; dest - the length of the array to be created.; destPos - starting position in the destination data.; length - the number of array elements to be copied.
Returns:: the initialized copy of src.
Throws:: IndexOutOfBoundsException - if copying would cause access of data outside array bounds.; ArrayStoreException - if an element in the src array could not be stored into the dest array because of a type mismatch.; NullPointerException - if either src or dest is null.

copy

public static short[] copy(short[] src,
                           int srcPos,
                           int destLength,
                           int destPos,
                           int length)

Make a new short array and initialize its contents from the contents of a specified short array.

Parameters:: src - the source array.; srcPos - starting position in the source array.; destLength - the length of the array to be created.; destPos - starting position in the destination data.; length - the number of array elements to be copied.
Returns:: the initialized copy of src.
Throws:: IndexOutOfBoundsException - if copying would cause access of data outside array bounds.; ArrayStoreException - if an element in the src array could not be stored into the dest array because of a type mismatch.; NullPointerException - if either src or dest is null.

copy

public static boolean[] copy(boolean[] src,
                             int srcPos,
                             int destLength,
                             int destPos,
                             int length)

Make a new boolean array and initialize its contents from the contents of a specified boolean array.

Parameters:: src - the source array.; srcPos - starting position in the source array.; destLength - the length of the array to be created.; destPos - starting position in the destination data.; length - the number of array elements to be copied.
Returns:: the initialized copy of src.
Throws:: IndexOutOfBoundsException - if copying would cause access of data outside array bounds.; ArrayStoreException - if an element in the src array could not be stored into the dest array because of a type mismatch.; NullPointerException - if either src or dest is null.

equals

public static boolean equals(Object a,
                             Object b)

Returns true if the two specified Objects are equal to one another. The two objects are considered equal if they are both array objects and are equal as determined by the relevant 'equals' method in this class. If both objects are non-array objects, then they are equal if a.equals(b) return true. If only one object is an array object, then the two objects are not equal.

Parameters:: a -; b -
Returns:: true if the two arrays are equal.

equals

public static boolean equals(byte[] a,
                             byte[] a2)

Returns true if the two specified arrays of bytes are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.

Parameters:: a - one array to be tested for equality.; a2 - the other array to be tested for equality.
Returns:: true if the two arrays are equal.

equals

public static boolean equals(char[] a,
                             char[] a2)

Returns true if the two specified arrays of chars are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.

Parameters:: a - one array to be tested for equality.; a2 - the other array to be tested for equality.
Returns:: true if the two arrays are equal.

equals

public static boolean equals(double[] a,
                             double[] a2)

Returns true if the two specified arrays of doubles are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.

Two doubles d1 and d2 are considered equal if:

    new Double(d1).equals(new Double(d2))

(Unlike the == operator, this method considers NaN equals to itself, and 0.0d unequal to -0.0d.)

Parameters:: a - one array to be tested for equality.; a2 - the other array to be tested for equality.
Returns:: true if the two arrays are equal.
See Also:: Double.equals(Object)

equals

public static boolean equals(float[] a,
                             float[] a2)

Returns true if the two specified arrays of floats are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.

Two floats f1 and f2 are considered equal if:

    new Float(f1).equals(new Float(f2))

(Unlike the == operator, this method considers NaN equals to itself, and 0.0f unequal to -0.0f.)

Parameters:: a - one array to be tested for equality.; a2 - the other array to be tested for equality.
Returns:: true if the two arrays are equal.
See Also:: Float.equals(Object)

equals

public static boolean equals(int[] a,
                             int[] a2)

Returns true if the two specified arrays of ints are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.

Parameters:: a - one array to be tested for equality.; a2 - the other array to be tested for equality.
Returns:: true if the two arrays are equal.

equals

public static boolean equals(long[] a,
                             long[] a2)

Returns true if the two specified arrays of longs are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.

Parameters:: a - one array to be tested for equality.; a2 - the other array to be tested for equality.
Returns:: true if the two arrays are equal.

equals

public static boolean equals(Object[] a,
                             Object[] a2)

Returns true if the two specified arrays of Objects are equal to one another. The two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. Two objects e1 and e2 are considered equal if (e1==null ? e2==null : e1.equals(e2)). In other words, the two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.

Parameters:: a - one array to be tested for equality.; a2 - the other array to be tested for equality.
Returns:: true if the two arrays are equal.

equals

public static boolean equals(short[] a,
                             short[] a2)

Returns true if the two specified arrays of shorts are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.

Parameters:: a - one array to be tested for equality.; a2 - the other array to be tested for equality.
Returns:: true if the two arrays are equal.

equals

public static boolean equals(boolean[] a,
                             boolean[] a2)

Returns true if the two specified arrays of booleans are equal to one another. Two arrays are considered equal if both arrays contain the same number of elements, and all corresponding pairs of elements in the two arrays are equal. In other words, two arrays are equal if they contain the same elements in the same order. Also, two array references are considered equal if both are null.

Parameters:: a - one array to be tested for equality.; a2 - the other array to be tested for equality.
Returns:: true if the two arrays are equal.

fill

public static void fill(byte[] a,
                        byte val)

Assigns the specified byte value to each element of the specified array of bytes.

Parameters:: a - the array to be filled.; val - the value to be stored in all elements of the array.

fill

public static void fill(byte[] a,
                        int fromIndex,
                        int toIndex,
                        byte val)

Assigns the specified byte value to each element of the specified range of the specified array of bytes. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)

Parameters:: a - the array to be filled.; fromIndex - the index of the first element (inclusive) to be filled with the specified value.; toIndex - the index of the last element (exclusive) to be filled with the specified value.; val - the value to be stored in all elements of the array.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

fill

public static void fill(char[] a,
                        char val)

Assigns the specified char value to each element of the specified array of chars.

Parameters:: a - the array to be filled.; val - the value to be stored in all elements of the array.

fill

public static void fill(char[] a,
                        int fromIndex,
                        int toIndex,
                        char val)

Assigns the specified char value to each element of the specified range of the specified array of chars. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)

Parameters:: a - the array to be filled.; fromIndex - the index of the first element (inclusive) to be filled with the specified value.; toIndex - the index of the last element (exclusive) to be filled with the specified value.; val - the value to be stored in all elements of the array.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

fill

public static void fill(double[] a,
                        double val)

Assigns the specified double value to each element of the specified array of doubles.

Parameters:: a - the array to be filled.; val - the value to be stored in all elements of the array.

fill

public static void fill(double[] a,
                        int fromIndex,
                        int toIndex,
                        double val)

Assigns the specified double value to each element of the specified range of the specified array of doubles. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)

Parameters:: a - the array to be filled.; fromIndex - the index of the first element (inclusive) to be filled with the specified value.; toIndex - the index of the last element (exclusive) to be filled with the specified value.; val - the value to be stored in all elements of the array.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

fill

public static void fill(float[] a,
                        float val)

Assigns the specified float value to each element of the specified array of floats.

Parameters:: a - the array to be filled.; val - the value to be stored in all elements of the array.

fill

public static void fill(float[] a,
                        int fromIndex,
                        int toIndex,
                        float val)

Assigns the specified float value to each element of the specified range of the specified array of floats. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)

Parameters:: a - the array to be filled.; fromIndex - the index of the first element (inclusive) to be filled with the specified value.; toIndex - the index of the last element (exclusive) to be filled with the specified value.; val - the value to be stored in all elements of the array.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

fill

public static void fill(int[] a,
                        int val)

Assigns the specified int value to each element of the specified array of ints.

Parameters:: a - the array to be filled.; val - the value to be stored in all elements of the array.

fill

public static void fill(int[] a,
                        int fromIndex,
                        int toIndex,
                        int val)

Assigns the specified int value to each element of the specified range of the specified array of ints. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)

Parameters:: a - the array to be filled.; fromIndex - the index of the first element (inclusive) to be filled with the specified value.; toIndex - the index of the last element (exclusive) to be filled with the specified value.; val - the value to be stored in all elements of the array.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

fill

public static void fill(long[] a,
                        int fromIndex,
                        int toIndex,
                        long val)

Assigns the specified long value to each element of the specified range of the specified array of longs. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)

Parameters:: a - the array to be filled.; fromIndex - the index of the first element (inclusive) to be filled with the specified value.; toIndex - the index of the last element (exclusive) to be filled with the specified value.; val - the value to be stored in all elements of the array.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

fill

public static void fill(long[] a,
                        long val)

Assigns the specified long value to each element of the specified array of longs.

Parameters:: a - the array to be filled.; val - the value to be stored in all elements of the array.

fill

public static void fill(Object[] a,
                        int fromIndex,
                        int toIndex,
                        Object val)

Assigns the specified Object reference to each element of the specified range of the specified array of Objects. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)

Parameters:: a - the array to be filled.; fromIndex - the index of the first element (inclusive) to be filled with the specified value.; toIndex - the index of the last element (exclusive) to be filled with the specified value.; val - the value to be stored in all elements of the array.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

fill

public static void fill(Object[] a,
                        Object val)

Assigns the specified Object reference to each element of the specified array of Objects.

Parameters:: a - the array to be filled.; val - the value to be stored in all elements of the array.

fill

public static void fill(short[] a,
                        int fromIndex,
                        int toIndex,
                        short val)

Assigns the specified short value to each element of the specified range of the specified array of shorts. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)

Parameters:: a - the array to be filled.; fromIndex - the index of the first element (inclusive) to be filled with the specified value.; toIndex - the index of the last element (exclusive) to be filled with the specified value.; val - the value to be stored in all elements of the array.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

fill

public static void fill(short[] a,
                        short val)

Assigns the specified short value to each element of the specified array of shorts.

Parameters:: a - the array to be filled.; val - the value to be stored in all elements of the array.

fill

public static void fill(boolean[] a,
                        int fromIndex,
                        int toIndex,
                        boolean val)

Assigns the specified boolean value to each element of the specified range of the specified array of booleans. The range to be filled extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be filled is empty.)

Parameters:: a - the array to be filled.; fromIndex - the index of the first element (inclusive) to be filled with the specified value.; toIndex - the index of the last element (exclusive) to be filled with the specified value.; val - the value to be stored in all elements of the array.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

fill

public static void fill(boolean[] a,
                        boolean val)

Assigns the specified boolean value to each element of the specified array of booleans.

Parameters:: a - the array to be filled.; val - the value to be stored in all elements of the array.

hashCode

public static int hashCode(Object object)

Returns a hashcode for a given object. If object is not an array, the returned hashcode will be the same as if object.hashCode() was called. If object is an array, then computed hashcode follows the general contract of Object.hashCode() with respect to the equals methods in this class. That is, any two array objects that are equal according to the appropriate equals method will have the same hashcode.

Parameters:: object - the object for which a hash code is required
Returns:: the hash code of object

length

public static int length(Object array)

Returns the length of the specified array object, as an int.

Parameters:: array - the array
Returns:: the length of array
Throws:: IllegalArgumentException - if array argument is not an array

sort

public static void sort(byte[] a)

Sorts the specified array of bytes into ascending numerical order. The sorting algorithm is a tuned quicksort, adapted from Jon L. Bentley and M. Douglas McIlroy's "Engineering a Sort Function", Software-Practice and Experience, Vol. 23(11) P. 1249-1265 (November 1993). This algorithm offers n*log(n) performance on many data sets that cause other quicksorts to degrade to quadratic performance.

Parameters:: a - the array to be sorted.

sort

public static void sort(byte[] a,
                        int fromIndex,
                        int toIndex)

Sorts the specified range of the specified array of bytes into ascending numerical order. The range to be sorted extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be sorted is empty.)

The sorting algorithm is a tuned quicksort, adapted from Jon L. Bentley and M. Douglas McIlroy's "Engineering a Sort Function", Software-Practice and Experience, Vol. 23(11) P. 1249-1265 (November 1993). This algorithm offers n*log(n) performance on many data sets that cause other quicksorts to degrade to quadratic performance.

Parameters:: a - the array to be sorted.; fromIndex - the index of the first element (inclusive) to be sorted.; toIndex - the index of the last element (exclusive) to be sorted.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

sort

public static void sort(char[] a)

Sorts the specified array of chars into ascending numerical order. The sorting algorithm is a tuned quicksort, adapted from Jon L. Bentley and M. Douglas McIlroy's "Engineering a Sort Function", Software-Practice and Experience, Vol. 23(11) P. 1249-1265 (November 1993). This algorithm offers n*log(n) performance on many data sets that cause other quicksorts to degrade to quadratic performance.

Parameters:: a - the array to be sorted.

sort

public static void sort(char[] a,
                        int fromIndex,
                        int toIndex)

Sorts the specified range of the specified array of chars into ascending numerical order. The range to be sorted extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be sorted is empty.)

Parameters:: a - the array to be sorted.; fromIndex - the index of the first element (inclusive) to be sorted.; toIndex - the index of the last element (exclusive) to be sorted.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

sort

public static void sort(double[] a)

Sorts the specified array of doubles into ascending numerical order.

The < relation does not provide a total order on all floating-point values; although they are distinct numbers -0.0 == 0.0 is true and a NaN value compares neither less than, greater than, nor equal to any floating-point value, even itself. To allow the sort to proceed, instead of using the < relation to determine ascending numerical order, this method uses the total order imposed by Double. This ordering differs from the < relation in that -0.0 is treated as less than 0.0 and NaN is considered greater than any other floating-point value. For the purposes of sorting, all NaN values are considered equivalent and equal.

Parameters:: a - the array to be sorted.

sort

public static void sort(double[] a,
                        int fromIndex,
                        int toIndex)

Sorts the specified range of the specified array of doubles into ascending numerical order. The range to be sorted extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be sorted is empty.)

Parameters:: a - the array to be sorted.; fromIndex - the index of the first element (inclusive) to be sorted.; toIndex - the index of the last element (exclusive) to be sorted.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

sort

public static void sort(float[] a)

Sorts the specified array of floats into ascending numerical order.

The < relation does not provide a total order on all floating-point values; although they are distinct numbers -0.0f == 0.0f is true and a NaN value compares neither less than, greater than, nor equal to any floating-point value, even itself. To allow the sort to proceed, instead of using the < relation to determine ascending numerical order, this method uses the total order imposed by Float. This ordering differs from the < relation in that -0.0f is treated as less than 0.0f and NaN is considered greater than any other floating-point value. For the purposes of sorting, all NaN values are considered equivalent and equal.

Parameters:: a - the array to be sorted.

sort

public static void sort(float[] a,
                        int fromIndex,
                        int toIndex)

Sorts the specified range of the specified array of floats into ascending numerical order. The range to be sorted extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be sorted is empty.)

Parameters:: a - the array to be sorted.; fromIndex - the index of the first element (inclusive) to be sorted.; toIndex - the index of the last element (exclusive) to be sorted.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

sort

public static void sort(int[] a)

Sorts the specified array of ints into ascending numerical order. The sorting algorithm is a tuned quicksort, adapted from Jon L. Bentley and M. Douglas McIlroy's "Engineering a Sort Function", Software-Practice and Experience, Vol. 23(11) P. 1249-1265 (November 1993). This algorithm offers n*log(n) performance on many data sets that cause other quicksorts to degrade to quadratic performance.

Parameters:: a - the array to be sorted.

sort

public static void sort(int[] a,
                        int fromIndex,
                        int toIndex)

Sorts the specified range of the specified array of ints into ascending numerical order. The range to be sorted extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be sorted is empty.)

Parameters:: a - the array to be sorted.; fromIndex - the index of the first element (inclusive) to be sorted.; toIndex - the index of the last element (exclusive) to be sorted.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

sort

public static void sort(long[] a)

Sorts the specified array of longs into ascending numerical order. The sorting algorithm is a tuned quicksort, adapted from Jon L. Bentley and M. Douglas McIlroy's "Engineering a Sort Function", Software-Practice and Experience, Vol. 23(11) P. 1249-1265 (November 1993). This algorithm offers n*log(n) performance on many data sets that cause other quicksorts to degrade to quadratic performance.

Parameters:: a - the array to be sorted.

sort

public static void sort(long[] a,
                        int fromIndex,
                        int toIndex)

Sorts the specified range of the specified array of longs into ascending numerical order. The range to be sorted extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be sorted is empty.)

Parameters:: a - the array to be sorted.; fromIndex - the index of the first element (inclusive) to be sorted.; toIndex - the index of the last element (exclusive) to be sorted.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

sort

public static void sort(Object[] a,
                        int fromIndex,
                        int toIndex,
                        Comparer c)

Sorts the specified range of the specified array of objects according to the order induced by the specified Comparer. The range to be sorted extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be sorted is empty.) All elements in the range must be mutually comparable by the specified Comparer (that is, c.compare(e1, e2) must not throw a ClassCastException for any elements e1 and e2 in the range).

This sort is guaranteed to be stable: equal elements will not be reordered as a result of the sort.

The sorting algorithm is a modified mergesort (in which the merge is omitted if the highest element in the low sublist is less than the lowest element in the high sublist). This algorithm offers guaranteed n*log(n) performance.

Parameters:: a - the array to be sorted.; fromIndex - the index of the first element (inclusive) to be sorted.; toIndex - the index of the last element (exclusive) to be sorted.; c - the Comparer to determine the order of the array. A null value indicates that the elements' natural ordering should be used.
Throws:: ClassCastException - if the array contains elements that are not mutually comparable using the specified Comparer.; IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length
See Also:: Comparer

sort

public static void sort(Object[] a,
                        Comparer c)

Sorts the specified array of objects according to the order induced by the specified Comparer. All elements in the array must be mutually comparable by the specified Comparer (that is, c.compare(e1, e2) must not throw a ClassCastException for any elements e1 and e2 in the array).

This sort is guaranteed to be stable: equal elements will not be reordered as a result of the sort.

Parameters:: a - the array to be sorted.; c - the Comparer to determine the order of the array.
Throws:: ClassCastException - if the array contains elements that are not mutually comparable using the specified Comparer.
See Also:: Comparer

sort

public static void sort(short[] a)

Sorts the specified array of shorts into ascending numerical order. The sorting algorithm is a tuned quicksort, adapted from Jon L. Bentley and M. Douglas McIlroy's "Engineering a Sort Function", Software-Practice and Experience, Vol. 23(11) P. 1249-1265 (November 1993). This algorithm offers n*log(n) performance on many data sets that cause other quicksorts to degrade to quadratic performance.

Parameters:: a - the array to be sorted.

sort

public static void sort(short[] a,
                        int fromIndex,
                        int toIndex)

Sorts the specified range of the specified array of shorts into ascending numerical order. The range to be sorted extends from index fromIndex, inclusive, to index toIndex, exclusive. (If fromIndex==toIndex, the range to be sorted is empty.)

Parameters:: a - the array to be sorted.; fromIndex - the index of the first element (inclusive) to be sorted.; toIndex - the index of the last element (exclusive) to be sorted.
Throws:: IllegalArgumentException - if fromIndex > toIndex; ArrayIndexOutOfBoundsException - if fromIndex < 0 or toIndex > a.length

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