ProcessBuilder redirectErrorStream() Method

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Description

The java.lang.ProcessBuilder.redirectErrorStream() method tells whether this process builder merges standard error and standard output. If this property is true, then any error output generated by subprocesses subsequently started by this object's start() method will be merged with the standard output, so that both can be read using the Process.getInputStream() method. This makes it easier to correlate error messages with the corresponding output. The initial value is false.

Declaration

Following is the declaration for java.lang.ProcessBuilder.redirectErrorStream() method

public boolean redirectErrorStream()

Parameters

  • NA

Return Value

This method returns this process builder's redirectErrorStream property

Exception

  • NA

Example

The following example shows the usage of lang.ProcessBuilder.redirectErrorStream() method.

package com.tutorialspoint;

public class ProcessBuilderDemo {

   public static void main(String[] args) {

      // create a new list of arguments for our process
      String[] list = {"notepad.exe", "test.txt"};

      // create the process builder
      ProcessBuilder pb = new ProcessBuilder(list);

      // check if errorstream is redirected
      System.out.println(""+pb.redirectErrorStream());
   }
}

Let us compile and run the above program, this will produce the following result:

false



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