Java.lang.System.setOut() Method

Description

The java.lang.System.setOut() method reassigns the "standard" output stream.

Declaration

Following is the declaration for java.lang.System.setOut() method

public static void setOut(PrintStream out)

Parameters

• out -- This is the standard output stream.

Return Value

This method does not return any value.

Exception

• SecurityException -- if a security manager exists and its checkPermission method doesn't allow reassigning of the standard output stream.

Example

The following example shows the usage of java.lang.System.setOut() method.

package com.tutorialspoint;

import java.lang.*;
import java.io.*;

public class SystemDemo {

   public static void main(String[] args) throws Exception
    
     // create file
     FileOutputStream f = new FileOutputStream("file.txt");
     
     System.setOut(new PrintStream(f));
        
     // this text will get redirected to file
     System.out.println("This is System class!!!");
   }
} 

Let us assume we have a text file file.txt which gets generated as an output for our example program.The file consist of:

This is System class!!!