现有T1T2T3三个线程，你怎样保证T2在T1执行完成之后执行，T3在T2执行完后执行？

Posted 2020-10-06

考察join

/**
 * 现有T1、T2、T3三个线程，你怎样保证T2在T1执行完成之后执行，T3在T2执行完后执行？
 * @author user
 *
 */
public class Test3 {

	public static void main(String[] args) throws InterruptedException {
		Thread T1 = new Thread(new T1());
		Thread T2 = new Thread(new T2());
		Thread T3 = new Thread(new T3());
		
		T1.start();
		T1.join();
		T2.start();
		T2.join();
		T3.start();
		T3.join();
	}
}
class T1 implements Runnable{

	@Override
	public void run() {
		System.out.println(Thread.currentThread()+"T1");
		try {
			Thread.sleep(3000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
	
}

class T2 implements Runnable{

	@Override
	public void run() {
		System.out.println(Thread.currentThread()+"T2");
		try {
			Thread.sleep(3000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
}

class T3 implements Runnable{

	@Override
	public void run() {
		System.out.println(Thread.currentThread()+"T3");
		try {
			Thread.sleep(3000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
	
}

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