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Java OutputStream close() Method with Example

OutputStream Class close() method: Here, we are going to learn about the close() method of OutputStream Class with its syntax and example.
Submitted by Preeti Jain, on April 16, 2020

OutputStream Class close() method

• close() method is available in java.io package.
• close() method is used to close this OutputStream stream and free all system resources linked with this stream and it cannot be re-opened and perform any output operation once it is closed.
• 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 OutputStream

import java.io.*;

public class CloseOfOS {
 public static void main(String[] args) throws Exception {
  OutputStream os_stm = null;
  InputStream is_stm = null;
  int val = 65;

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

   // By using close() method is to close
   // the stream and when we call write, read
   // after closing the stream will result an 
   // exception
   os_stm.close();
   // Loop to write byte to the stream
   for (int i = 0; i < 3; ++i) {
    os_stm.write(val);
    val++;
   }
   // Loop to read byte from the stream
   for (int i = 0; i < 3; ++i) {
    char ch = (char) is_stm.read();
    System.out.println("ch: " + ch);
   }

  } 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 (os_stm != null) {
     os_stm.close();
    }
   }
  }
 }
}

Output

Stream Closed Before...