Introduction
The Java.io Writer is the class used for writing the content in the form of text like characters rather than bytes. TheJava.io Writer is the super class to all the writer classes available in java. The writer is similar to that output stream class the only difference is that writer is used to write the characters where as output stream writes the bytes of data.
Conceptual
figure
Declaration
Java.io Writer class is declared below:
Public class Writer extends Object implements Flushable, Appendable, Closeable Fields
Java.io Writer class fields are:
- Protected Object Lock : For synchronize operations this object is used in writer class.
Table
| Constructor | Description |
|---|---|
| Protected writer () | The function of this constructor is to create the writer instance and used to write character stream. |
| Protected Writer(Object lock) | The function of this constructor is to create the writer instance and synchronize the sections in the given object. |
Table
| Method | Description |
|---|---|
| abstract void close () | The function of this method is to close the present stream and associated to input stream systems resources are released. |
| abstract void flush () | The function of this method is to flush the specified output stream. |
| void write (int c) | The function of this method is to write the represented character into output stream. |
| abstract void write (Char[] cbuf, int off, int n) | By using this method it writes the data up to ‘n’ length from the output stream to an array of Characters. |
| write append (CharacterSequence cs) | The function of this method is to write the represented append character sequence into output stream. |
Description
From the following classes, methods are inherited to the writer class.
- Java.io.object
Examples
Usage of void write (int c) method.
[c]package com.cp.io;
import java.io.*;
public class Writer
{
public static void main(String[] args) throws IOException
{
int c = 83;
// creating a new writer instance
PrintWriter writer = new PrintWriter(System.out);
// write an integer value that is printed as ASCII
writer.write(c);
// To flush the writer
writer.flush();
// write another integer value that is printed as ASCII
writer.write(80);
// To flush the stream
writer.flush();
// write another integer value that is printed as ASCII
writer.write(76);
// To flush the stream
writer.flush();
}
}
[/c]
Output
The result will be as follows.
[c]SPL[/c]
Usage of abstract void write (Char[] cbuf, int off, int n) method.
[c]
package com.cp.io;
import java.io.*;
public class Writer
{
public static void main(String[] args) throws IOException
{
char[] c = {'S', 'P', 'L', 'E', 'S', 'S', 'O', 'N', 'S'};
// Creating a new writer instance
PrintWriter writer = new PrintWriter(System.out);
// To write a portion of a char array
writer.write(c, 0, 5);
// To flush the writer
writer.flush();
// write remaining portion of a char array
writer.write(c, 4, 4);
// To flush the stream
writer.close();
}
}[/c]
Output
The result will be as follows.
[c]SPLESSSON[/c]
Key Points
- The Java.io Writer is the class used for writing the content in the form of text like characters rather than bytes.
- The writer is the super class to all the writer classes available in java.
- The writer is similar to that output stream class the only difference is that writer is used to write the characters where as output stream writes the bytes of data.