JAVA multi-threaded Merger thread join

A thread during a possession cpu resources, other resources can make calls join () and this thread joint, such as:
B.join ();

A joint during operation when the B, A thread execution is interrupted immediately, wait until he finished joint thread B, A thread re-queued for CPU resources.

Code

package 合并线程join;
public class JOIN {
	
	public static void main(String[] args) {
		Thread t =new Thread(()->{ //lambde模式
			for (int i = 1; i <= 5; i++) {
				System.out.println(Thread.currentThread().getName()+i);
			}
		},"小美") ;
				
		t.start();
		for (int i = 1; i <=5; i++) {
			System.out.println(i);
			if(i%3==0) {
				try {
					t.join();//插队
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}//
			}
		}
	}
}