java.io
Class PrintStream

java.lang.Object
  java.io.OutputStream
      java.io.PrintStream

public class PrintStream
extends OutputStream

A PrintStream adds functionality to another output stream, namely the ability to print representations of various data values conveniently. Two other features are provided as well. Unlike other output streams, a PrintStream never throws an IOException; instead, exceptional situations merely set an internal flag that can be tested via the checkError method.

All characters printed by a PrintStream are converted into bytes using the platform's default character encoding.

Since:

JDK1.0, CLDC 1.0

Version:

12/17/01 (CLDC 1.1)

Author:

Frank Yellin, Mark Reinhold

Constructor Summary

PrintStream(OutputStream out)
Create a new print stream.

Method Summary

boolean	checkError() Flush the stream and check its error state.
void	close() Close the stream.
void	flush() Flush the stream.
void	print(boolean b) Print a boolean value.
void	print(char c) Print a character.
void	print(char[] s) Print an array of characters.
void	print(double d) Print a double-precision floating point number.
void	print(float f) Print a floating point number.
void	print(int i) Print an integer.
void	print(long l) Print a long integer.
void	print(Object obj) Print an object.
void	print(String s) Print a string.
void	println() Terminate the current line by writing the line separator string.
void	println(boolean x) Print a boolean and then terminate the line.
void	println(char x) Print a character and then terminate the line.
void	println(char[] x) Print an array of characters and then terminate the line.
void	println(double x) Print a double and then terminate the line.
void	println(float x) Print a float and then terminate the line.
void	println(int x) Print an integer and then terminate the line.
void	println(long x) Print a long and then terminate the line.
void	println(Object x) Print an Object and then terminate the line.
void	println(String x) Print a String and then terminate the line.
protected void	setError() Set the error state of the stream to true.
void	write(byte[] buf, int off, int len) Write len bytes from the specified byte array starting at offset off to this stream.
void	write(int b) Write the specified byte to this stream.

Methods inherited from class java.io.OutputStream

write

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PrintStream

public PrintStream(OutputStream out)

Create a new print stream. This stream will not flush automatically.

Parameters:

out - The output stream to which values and objects will be printed

Method Detail

checkError

public boolean checkError()

Flush the stream and check its error state. The internal error state is set to true when the underlying output stream throws an IOException, and when the setError method is invoked.

Returns:

True if and only if this stream has encountered an IOException, or the setError method has been invoked

close

public void close()

Close the stream. This is done by flushing the stream and then closing the underlying output stream.

Overrides:

close in class OutputStream

See Also:

OutputStream.close()

flush

public void flush()

Flush the stream. This is done by writing any buffered output bytes to the underlying output stream and then flushing that stream.

Overrides:

flush in class OutputStream

See Also:

OutputStream.flush()

print

public void print(char c)

Print a character. The character is translated into one or more bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.

Parameters:

c - The char to be printed

print

public void print(double d)

Print a double-precision floating point number. The string produced by String.valueOf(double) is translated into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.

Parameters:

d - The double to be printed

Since:

CLDC 1.1

See Also:

Double.toString(double)

print

public void print(float f)

Print a floating point number. The string produced by String.valueOf(float) is translated into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.

Parameters:

f - The float to be printed

Since:

CLDC 1.1

See Also:

Float.toString(float)

print

public void print(int i)

Print an integer. The string produced by String.valueOf(int) is translated into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.

Parameters:

i - The int to be printed

See Also:

Integer.toString(int)

print

public void print(long l)

Print a long integer. The string produced by String.valueOf(long) is translated into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.

Parameters:

l - The long to be printed

See Also:

Long.toString(long)

print

public void print(Object obj)

Print an object. The string produced by the String.valueOf(Object) method is translated into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.

Parameters:

obj - The Object to be printed

See Also:

Object.toString()

print

public void print(String s)

Print a string. If the argument is null then the string "null" is printed. Otherwise, the string's characters are converted into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.

Parameters:

s - The String to be printed

print

public void print(boolean b)

Print a boolean value. The string produced by String.valueOf(boolean) is translated into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.

Parameters:

b - The boolean to be printed

print

public void print(char[] s)

Print an array of characters. The characters are converted into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.

Parameters:

s - The array of chars to be printed

Throws:

NullPointerException - If s is null

println

public void println()

Terminate the current line by writing the line separator string. The line separator string is defined by the system property line.separator, and is not necessarily a single newline character ('\n').

println

public void println(char x)

Print a character and then terminate the line. This method behaves as though it invokes print(char) and then println().

Parameters:

x - The char to be printed.

println

public void println(double x)

Print a double and then terminate the line. This method behaves as though it invokes print(double) and then println().

Parameters:

x - The double to be printed.

Since:

CLDC 1.1

println

public void println(float x)

Print a float and then terminate the line. This method behaves as though it invokes print(float) and then println().

Parameters:

x - The float to be printed.

Since:

CLDC 1.1

println

public void println(int x)

Print an integer and then terminate the line. This method behaves as though it invokes print(int) and then println().

Parameters:

x - The int to be printed.

println

public void println(long x)

Print a long and then terminate the line. This method behaves as though it invokes print(long) and then println().

Parameters:

x - The long to be printed.

println

public void println(Object x)

Print an Object and then terminate the line. This method behaves as though it invokes print(Object) and then println().

Parameters:

x - The Object to be printed.

println

public void println(String x)

Print a String and then terminate the line. This method behaves as though it invokes print(String) and then println().

Parameters:

x - The String to be printed.

println

public void println(boolean x)

Print a boolean and then terminate the line. This method behaves as though it invokes print(boolean) and then println().

Parameters:

x - The boolean to be printed

println

public void println(char[] x)

Print an array of characters and then terminate the line. This method behaves as though it invokes print(char[]) and then println().

Parameters:

x - an array of chars to print.

setError

protected void setError()

Set the error state of the stream to true.

Since:

JDK1.1

write

public void write(int b)

Write the specified byte to this stream.

Note that the byte is written as given; to write a character that will be translated according to the platform's default character encoding, use the print(char) or println(char) methods.

Specified by:

write in class OutputStream

Parameters:

b - The byte to be written

See Also:

print(char), println(char)

write

public void write(byte[] buf,
                  int off,
                  int len)

Write len bytes from the specified byte array starting at offset off to this stream.

Note that the bytes will be written as given; to write characters that will be translated according to the platform's default character encoding, use the print(char) or println(char) methods.

Overrides:

write in class OutputStream

Parameters:

buf - A byte array

off - Offset from which to start taking bytes

len - Number of bytes to write