Java.io.FilterReader.reset() Method

Description

The java.io.FilterReader.reset() method repositions the stream where the recent mark() was invoked.

Declaration

Following is the declaration for java.io.FilterReader.reset() method:

public void reset()

Parameters

• NA

Return Value

The method does not return any value.

Exception

• IOException -- If an I/O error occurs.

Example

The following example shows the usage of java.io.FilterReader.reset() method.

package com.tutorialspoint;

import java.io.FilterReader;
import java.io.Reader;
import java.io.StringReader;

public class FilterReaderDemo {
   public static void main(String[] args) throws Exception {
      
      FilterReader fr = null;
      Reader r = null;
            
      try{
         // create new reader
         r = new StringReader("ABCDEF");
          
         // create new filter reader
         fr = new FilterReader(r) {
         };
         
         // read and print characters one by one
         System.out.println("Char : "+(char)fr.read());
         System.out.println("Char : "+(char)fr.read());
         System.out.println("Char : "+(char)fr.read());
            
         // mark is set on the filter reader
         fr.mark(0);
         System.out.println("Char : "+(char)fr.read());
         System.out.println("reset() invoked");
            
         // reset is called
         fr.reset();
            
         // read and print characters
         System.out.println("char : "+(char)fr.read());
         System.out.println("char : "+(char)fr.read());
         
      }catch(Exception e){
         
         // if any I/O error occurs
         e.printStackTrace();
      }finally{
         
         // releases system resources associated with this stream
         if(r!=null)
            r.close();
         if(fr!=null)
            fr.close();
      }
   }
}

Let us compile and run the above program, this will produce the following result:

Char : A
Char : B
Char : C
Char : D
reset() invoked
char : D
char : E