- java.lang.Object
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- java.io.Writer
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- java.io.CharArrayWriter
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- All Implemented Interfaces:
- Closeable, Flushable, Appendable, AutoCloseable
public class CharArrayWriter extends Writer
This class implements a character buffer that can be used as an Writer. The buffer automatically grows when data is written to the stream. The data can be retrieved using toCharArray() and toString().Note: Invoking close() on this class has no effect, and methods of this class can be called after the stream has closed without generating an IOException.
- Since:
- JDK1.1
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Field Summary
Fields Modifier and Type Field and Description protected char[]
buf
The buffer where data is stored.protected int
count
The number of chars in the buffer.-
Fields inherited from class java.io.Writer
lock
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Constructor Summary
Constructors Constructor and Description CharArrayWriter()
Creates a new CharArrayWriter.CharArrayWriter(int initialSize)
Creates a new CharArrayWriter with the specified initial size.
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Method Summary
Methods Modifier and Type Method and Description CharArrayWriter
append(char c)
Appends the specified character to this writer.CharArrayWriter
append(CharSequence csq)
Appends the specified character sequence to this writer.CharArrayWriter
append(CharSequence csq, int start, int end)
Appends a subsequence of the specified character sequence to this writer.void
close()
Close the stream.void
flush()
Flush the stream.void
reset()
Resets the buffer so that you can use it again without throwing away the already allocated buffer.int
size()
Returns the current size of the buffer.char[]
toCharArray()
Returns a copy of the input data.String
toString()
Converts input data to a string.void
write(char[] c, int off, int len)
Writes characters to the buffer.void
write(int c)
Writes a character to the buffer.void
write(String str, int off, int len)
Write a portion of a string to the buffer.void
writeTo(Writer out)
Writes the contents of the buffer to another character stream.
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Field Detail
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buf
protected char[] buf
The buffer where data is stored.
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count
protected int count
The number of chars in the buffer.
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Constructor Detail
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CharArrayWriter
public CharArrayWriter()
Creates a new CharArrayWriter.
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CharArrayWriter
public CharArrayWriter(int initialSize)
Creates a new CharArrayWriter with the specified initial size.- Parameters:
initialSize
- an int specifying the initial buffer size.- Throws:
IllegalArgumentException
- if initialSize is negative
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Method Detail
-
write
public void write(int c)
Writes a character to the buffer.
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write
public void write(char[] c, int off, int len)
Writes characters to the buffer.
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write
public void write(String str, int off, int len)
Write a portion of a string to the buffer.
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writeTo
public void writeTo(Writer out) throws IOException
Writes the contents of the buffer to another character stream.- Parameters:
out
- the output stream to write to- Throws:
IOException
- If an I/O error occurs.
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append
public CharArrayWriter append(CharSequence csq)
Appends the specified character sequence to this writer.An invocation of this method of the form out.append(csq) behaves in exactly the same way as the invocation
out.write(csq.toString())
Depending on the specification of toString for the character sequence csq, the entire sequence may not be appended. For instance, invoking the toString method of a character buffer will return a subsequence whose content depends upon the buffer's position and limit.
- Specified by:
append
in interfaceAppendable
- Overrides:
append
in classWriter
- Parameters:
csq
- The character sequence to append. If csq is null, then the four characters "null" are appended to this writer.- Returns:
- This writer
- Since:
- 1.5
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append
public CharArrayWriter append(CharSequence csq, int start, int end)
Appends a subsequence of the specified character sequence to this writer.An invocation of this method of the form out.append(csq, start, end) when csq is not null, behaves in exactly the same way as the invocation
out.write(csq.subSequence(start, end).toString())
- Specified by:
append
in interfaceAppendable
- Overrides:
append
in classWriter
- Parameters:
csq
- The character sequence from which a subsequence will be appended. If csq is null, then characters will be appended as if csq contained the four characters "null".start
- The index of the first character in the subsequenceend
- The index of the character following the last character in the subsequence- Returns:
- This writer
- Throws:
IndexOutOfBoundsException
- If start or end are negative, start is greater than end, or end is greater than csq.length()- Since:
- 1.5
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append
public CharArrayWriter append(char c)
Appends the specified character to this writer.An invocation of this method of the form out.append(c) behaves in exactly the same way as the invocation
out.write(c)
- Specified by:
append
in interfaceAppendable
- Overrides:
append
in classWriter
- Parameters:
c
- The 16-bit character to append- Returns:
- This writer
- Since:
- 1.5
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reset
public void reset()
Resets the buffer so that you can use it again without throwing away the already allocated buffer.
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toCharArray
public char[] toCharArray()
Returns a copy of the input data.- Returns:
- an array of chars copied from the input data.
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size
public int size()
Returns the current size of the buffer.- Returns:
- an int representing the current size of the buffer.
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toString
public String toString()
Converts input data to a string.
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flush
public void flush()
Flush the stream.
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close
public void close()
Close the stream. This method does not release the buffer, since its contents might still be required. Note: Invoking this method in this class will have no effect.
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Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-java/io/CharArrayWriter.html
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