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join_method.java

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class Thread1 extends Thread

{

public void run()

{

for(int i=0;i<5;i++)

System.out.println("Thread1");

}

}

class Thread2 extends Thread

{

static Thread t_hold_1;

public void run() {

try

{

t_hold_1.join();//as t_hold_1 contain thread 1

}

catch(Exception e)

{

}

for (int i = 0; i < 5; i++)

System.out.println("Thread2");

}

}

/**

*Here main thread is waiting for Thread2 to execute by calling t2.join() and thread2 is waiting

for Thread1 to execute by calling t_hold_1.join() as t_hold_1 refer Thread1

so 1st Thread1 execute and then Thread2 and then main

*/

class join_method

{

//join method throw InterruptedException which is checked so we must handle it

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

{

Thread1 t1=new Thread1();

Thread2.t_hold_1=t1;

Thread2 t2=new Thread2();

t1.start();

t2.start();

t2.join();

for(int i=0;i<5;i++)

System.out.println("main");

}

}