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Java InputStreamReader close() Method with Example

InputStreamReader Class close() method: Here, we are going to learn about the close() method of InputStreamReader Class with its syntax and example.
Submitted by Preeti Jain, on April 13, 2020

InputStreamReader Class close() method

• close() method is available in java.io package.
• close() method is used to close this InputStreamReader stream and free all system resources linked with this stream.
• close() 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.
• close() method may throw an exception at the time of closing the stream.
  IOException: This exception may throw when getting any input/output error while performing.

Syntax:

    public void close();

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 close() method of InputStreamReader

import java.io.*;
public class CloseOfISR {
 public static void main(String[] args) throws Exception {
  InputStream is_stm = null;
  InputStreamReader isr_stm = null;
  int val = 0;

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

   // By using close() method is to close
   // close the stream     
   isr_stm.close();

   // when we call read() method after
   // closing the stream will result an exception
   val = isr_stm.read();

  } catch (Exception ex) {
   System.out.println("Stream Closed Before!!!!");
  } finally {
   // with the help of this block is to
   // free all necessary resources linked
   // with the stream
   if (is_stm != null) {
    is_stm.close();

    if (isr_stm != null) {
     isr_stm.close();
    }
   }
  }
 }
}

Output

Stream Closed Before!!!!