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Java Process getErrorStream() method with example

Process Class getErrorStream() method: Here, we are going to learn about the getErrorStream() method of Process Class with its syntax and example.
Submitted by Preeti Jain, on December 10, 2019

Process Class getErrorStream() method

• getErrorStream() method is available in java.lang package.
• getErrorStream() method is used to get the error stream of the processes or subprocess.
• getErrorStream() 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.
• getErrorStream() method does not throw an exception at the time of returning input stream.

Syntax:

    public abstract InputStream getErrorStream();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of this method is InputStream, it returns InputStream associated to the error stream of the process and subprocess.

Example:

// Java program to demonstrate the example 
// of InputStream getErrorStream() method 
// of Process 

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

public class GetErrorStream {
    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 errorStream() method is to get the 
        // error stream of pr object

        InputStream is = pr.getErrorStream();

        // Read from InputStream
        for (int k = 0; k < is.available(); ++k)
            System.out.println("Error stream = " + is.read());

        // Destroy a process
        pr.destroy();
        System.out.println("Process Destroyed");
    }
}

Output

Process Instantiated
Process Destroyed