Java - System.setOut() Examples

package com.logicbig.example.system;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;

public class SetOutExample {

    public static void main(String... args) {
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        PrintStream ps = new PrintStream(stream);

        PrintStream originalPrintStream = System.out;

        System.setOut(ps);

        //it wil output to our stream
        System.out.println("printing something");

        //set it back
        System.setOut(originalPrintStream);

        System.out.println("-- retrieving output from stream --");
        String output = new String(stream.toByteArray());
        System.out.println("> " + output);
    }
}