public class JoinTest {
//thread.Join adds the specified thread to the current thread, which can merge two alternately executed threads into a sequentially executed thread.
//For example, the Join() method of thread A is called in thread B, and thread B will not continue to be executed until thread A is executed.
public static void main(String[] args) throws InterruptedException {
int num = 3;
System.out.println(System.currentTimeMillis());
for (int i = 0; i <num; i++) {
JoinRunnable joinRunnable = new JoinRunnable(i);
Thread thread = new Thread(joinRunnable);
thread.start();
thread.join();
//thread.join(1000);
}
System.out.println(System.currentTimeMillis());
}
public static class JoinRunnable implements Runnable{
private int taskId;
public JoinRunnable(int taskId) {
this.taskId = taskId;
}
@Override
public void run() {
try {
Thread.sleep(taskId*1000);
System.out.println( "taskId="+taskId+",time="+System.currentTimeMillis());
} catch (InterruptedException e) {
e.printStackTrace ();
}
}
}
}
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