Thread Join method in java

SAMPLE PROGRAM

Note: output might differ from system to system in threading

public class MainClass {

       public static void main(String[] args) throws InterruptedException {

              Test testObj=new Test();

              Thread t1=new Thread(testObj);

              t1.start(); //main thread created the t1 thread

              for(int i=0;i<20;i++){

               System.out.println("MAIN thread with i = "+i);

            }

              t1.join();

              System.out.println("End of main thread");

       }

      

}

class Test implements Runnable{

       @Override

       public void run() {

     for(int i=0;i<20;i++){

        System.out.println("thread with i = "+i);

     }

       }

}

Output:

MAIN thread with i = 0

thread with i = 0

MAIN thread with i = 1

thread with i = 1

MAIN thread with i = 2

thread with i = 2

MAIN thread with i = 3

thread with i = 3

MAIN thread with i = 4

thread with i = 4

MAIN thread with i = 5

thread with i = 5

MAIN thread with i = 6

thread with i = 6

MAIN thread with i = 7

thread with i = 7

MAIN thread with i = 8

thread with i = 8

MAIN thread with i = 9

thread with i = 9

MAIN thread with i = 10          //till here both main and t1 thread executing parallely

thread with i = 10               //join method called by main and main halts for sometime

thread with i = 11

thread with i = 12

thread with i = 13

thread with i = 14

thread with i = 15

thread with i = 16

thread with i = 17

thread with i = 18

thread with i = 19

MAIN thread with i = 11      //t1 finishes execution and main continues executing

MAIN thread with i = 12

MAIN thread with i = 13

MAIN thread with i = 14

MAIN thread with i = 15

MAIN thread with i = 16

MAIN thread with i = 17

MAIN thread with i = 18

MAIN thread with i = 19

End of main thread