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Java Process getOutputStream() method with example

Process Class getOutputStream() method: Here, we are going to learn about the getOutputStream() method of Process Class with its syntax and example.
Submitted by Preeti Jain, on December 11, 2019

Process Class getOutputStream() method

• getOutputStream() method is available in java.lang package.
• getOutputStream() method is used to get the output stream of the process and sub-process.
• getOutputStream() 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.
• getOutputStream() method does not throw an exception at the time of returning output stream.

Syntax:

    public abstract OutputStream getOutputStream();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of this method is OutputStream, it returns output stream associated to the standard input of the process.

Example:

// Java program to demonstrate the example 
// of OutputStream getOutputStream() method of Process 

import java.io.*;
import java.util.*;

public class GetOutputStream {
    public static void main(String[] args) throws Exception {
        // Instantiating Process object
        System.out.println("Process Instantiated");
        Process pr = Runtime.getRuntime().exec("notepad.exe");

        // By using getOutputStream() method is to get the 
        // output stream of pr object
        OutputStream os = pr.getOutputStream();


        // By using close() method is to close the output stream
        System.out.println("Output Stream Closed :");
        os.close();
    }
}

Output

Process Instantiated
Output Stream Closed :