Java.io.FilterWriter class in Java

Abstract class for writing filtered character streams. The abstract class FilterWriter itself provides default methods that pass all requests to the contained stream. Subclasses of FilterWriter should override some of these methods and may also provide additional methods and fields.
Constructor :

protected FilterWriter(Writer out) : Create a new filtered writer.

Methods :

void close() : Closes the stream, flushing it first.Once the stream has been closed, further write() or flush() invocations will cause an IOException to be thrown. Closing a previously closed stream has no effect.
```
Syntax :public void close()
           throws IOException
Throws:
IOException 
```

void flush() : Flushes the stream.

Syntax :public void flush()
           throws IOException
Throws:
IOException

void write(char[] cbuf, int off, int len) : Writes a portion of an array of characters.

Syntax :public void write(char[] cbuf,
         int off,
         int len)
           throws IOException
Parameters:
cbuf - Buffer of characters to be written
off - Offset from which to start reading characters
len - Number of characters to be written
Throws:
IOException

void write(int c) : Writes a single character.

Syntax :public void write(int c)
           throws IOException
Parameters:
c - int specifying a character to be written
Throws:
IOException

void write(String str, int off, int len) : Writes a portion of a string.

Syntax :public void write(String str,
         int off,
         int len)
           throws IOException
Parameters:
str - String to be written
off - Offset from which to start reading characters
len - Number of characters to be written
Throws:
IOException

Program :

//Java program demonstrating FilterWriter methods 

import java.io.FilterWriter; 

import java.io.StringWriter; 

import java.io.Writer; 

class FilterWriterDemo 
{ 

    public static void main(String[] args) throws Exception 

    { 

        FilterWriter fr = null; 

        Writer wr = null; 

        wr = new StringWriter(); 

        fr = new FilterWriter(wr) {} ; 

        String str = "Geeksfor"; 

        char c[] = {'G','e','e','k'}; 

        //illustrating write(String str,int off,int len) 

        fr.write(str); 

        //illustrating flush() 

        fr.flush(); 

        //illustrating write(char[] cff,int off,int len) 

        fr.write(c); 

        //illustrating write(int c) 

        fr.write('s'); 

        System.out.print(wr.toString()); 

        //close the stream 

        fr.close(); 

    } 
}

Output :

GeeksforGeeks

Article Tags :

Java