Package org.apache.commons.io.output

Class NullWriter

java.lang.Object

java.io.Writer

org.apache.commons.io.output.NullWriter

All Implemented Interfaces:

Closeable, Flushable, Appendable, AutoCloseable

public class NullWriter
extends Writer

Never writes data. Calls never go beyond this class.

This Writer has no destination (file/socket etc.) and all characters written to it are ignored and lost.

Field Summary

Fields

Modifier and Type	Field	Description
static final NullWriter	INSTANCE	The singleton instance.
static final NullWriter	NULL_WRITER	Deprecated. Use INSTANCE.

Fields inherited from class java.io.Writer

lock

Constructor Summary

Constructors

Constructor	Description
NullWriter()	Deprecated. Use INSTANCE.

Method Summary

Modifier and Type	Method	Description
Writer	append(char c)	Does nothing - output to /dev/null.
Writer	append(CharSequence csq)	Does nothing - output to /dev/null.
Writer	append(CharSequence csq, int start, int end)	Does nothing - output to /dev/null.
void	close()
void	flush()
void	write(char[] chr)	Does nothing - output to /dev/null.
void	write(char[] chr, int st, int end)	Does nothing - output to /dev/null.
void	write(int idx)	Does nothing - output to /dev/null.
void	write(String str)	Does nothing - output to /dev/null.
void	write(String str, int st, int end)	Does nothing - output to /dev/null.

Methods inherited from class java.lang.Object

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

Field Details

INSTANCE

public static final NullWriter INSTANCE

The singleton instance.

Since:

2.12.0

NULL_WRITER

@Deprecated
public static final NullWriter NULL_WRITER

Deprecated.

Use INSTANCE.

The singleton instance.

Constructor Details

NullWriter

@Deprecated
public NullWriter()

Deprecated.

Use INSTANCE.

Constructs a new NullWriter.

Method Details

append

public Writer append(char c)

Does nothing - output to /dev/null.

Specified by:

append in interface Appendable

Overrides:

append in class Writer

Parameters:

c - The character to write

Returns:

this writer

Since:

2.0

append

public Writer append(CharSequence csq)

Does nothing - output to /dev/null.

Specified by:

append in interface Appendable

Overrides:

append in class Writer

Parameters:

csq - The character sequence to write

Returns:

this writer

Since:

2.0

append

public Writer append(CharSequence csq,
 int start,
 int end)

Does nothing - output to /dev/null.

Specified by:

append in interface Appendable

Overrides:

append in class Writer

Parameters:

csq - The character sequence to write

start - The index of the first character to write

end - The index of the first character to write (exclusive)

Returns:

this writer

Since:

2.0

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in class Writer

See Also:

• Writer.close()

flush

public void flush()

Specified by:

flush in interface Flushable

Specified by:

flush in class Writer

See Also:

• Writer.flush()

write

public void write(char[] chr)

Does nothing - output to /dev/null.

Overrides:

write in class Writer

Parameters:

chr - The characters to write

write

public void write(char[] chr,
 int st,
 int end)

Does nothing - output to /dev/null.

Specified by:

write in class Writer

Parameters:

chr - The characters to write

st - The start offset

end - The number of characters to write

write

public void write(int idx)

Does nothing - output to /dev/null.

Overrides:

write in class Writer

Parameters:

idx - The character to write

write

public void write(String str)

Does nothing - output to /dev/null.

Overrides:

write in class Writer

Parameters:

str - The string to write

write

public void write(String str,
 int st,
 int end)

Does nothing - output to /dev/null.

Overrides:

write in class Writer

Parameters:

str - The string to write

st - The start offset

end - The number of characters to write