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Java InputStream reset() Method with Example

InputStream Class reset() method: Here, we are going to learn about the reset() method of InputStream Class with its syntax and example.
Submitted by Preeti Jain, on April 03, 2020

InputStream Class reset() method

• reset() method is available in java.io package.
• reset() method is used to reset the stream to the position marked by the mark() method most recently in this InputStream.
• reset() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• reset() method may throw an exception at the time of resetting the stream.
  IOException: This exception may throw when getting any input/output error while performing.

Syntax:

    public void reset();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is void, it returns nothing.

Example:

// Java program to demonstrate the example 
// of void reset() method of InputStream

import java.io.*;

public class ResetOfIS {
 public static void main(String[] args) throws Exception {
  InputStream is_stm = null;
  int val = 0;

  try {
   // Instantiates FileInputStream
   is_stm = new FileInputStream("D:\\includehelp.txt");

   // By using read() method isto 
   // read the character from is_stm
   char ch1 = (char) is_stm.read();
   char ch2 = (char) is_stm.read();

   System.out.println("ch1: " + ch1);
   System.out.println("ch2: " + ch2);

   // By using mark() method isto
   // set the current position in this
   // is_stm
   System.out.println("is_stm.mark(0): ");
   is_stm.mark(0);
   char ch3 = (char) is_stm.read();
   char ch4 = (char) is_stm.read();

   System.out.println("ch3: " + ch3);
   System.out.println("ch4: " + ch4);

   // By using reset() method isto
   // reset the stream to the position 
   // set by the call mark() method

   System.out.println("is_stm.reset(): ");
   is_stm.reset();
   char ch5 = (char) is_stm.read();
   char ch6 = (char) is_stm.read();

   System.out.println("ch3: " + ch5);
   System.out.println("ch4: " + ch6);
  } catch (Exception ex) {
   System.out.println("Reset Not Supported");

  } finally {
   // with the help of this block is to
   // free all necessary resources linked
   // with the stream
   if (is_stm != null) {
    is_stm.close();
   }
  }
 }
}

Output

ch1: J
ch2: A
is_stm.mark(0):
ch3: V
ch4: A
is_stm.reset():
Reset Not Supported