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Importance of join() method in Java?
A join() is a final method of Thread class and it can be used to join the start of a thread's execution to the end of another thread's execution so that a thread will not start running until another thread has ended. If the join() method is called on a thread instance, the currently running thread will block until the thread instance has finished executing.
Syntax
public final void join() throws InterruptedException
Example
public class JoinTest extends Thread { public void run() { for(int i=1; i <= 3; i++) { try { Thread.sleep(1000); } catch(Exception e) { System.out.println(e); } System.out.println("TutorialsPoint "+ i); } } public static void main(String args[]) { JoinTest t1 = new JoinTest(); JoinTest t2 = new JoinTest(); JoinTest t3 = new JoinTest(); t1.start(); try { t1.join(); // calling join() method } catch(Exception e) { System.out.println(e); } t2.start(); t3.start(); } }
Output
TutorialsPoint 1 TutorialsPoint 2 TutorialsPoint 3 TutorialsPoint 1 TutorialsPoint 1 TutorialsPoint 2 TutorialsPoint 2 TutorialsPoint 3 TutorialsPoint 3
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