25: 다중 스레드 두 가지 실현 방식의 관계와 스레드의 생명 주기

public class TwoThreadsTest {
	public static void main(String[] args) {
		new SimpleThread("hello").start();// hello      Thread      
		new SimpleThread("world").start();//       ，          Thread-n
	}
}

class SimpleThread extends Thread {
	public SimpleThread(String name) {
		// super(name);//     (Thread)     
		this.setName(name);//       ，      name   。
	}

	@Override
	public void run() {
		for (int i = 0; i < 10; i++) {
			System.out.println(i + " " + this.getName());//          
			try {
				sleep((long) (Math.random() * 5000));//    (0-5000  )
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			System.out.println("DONE!" + this.getName());
		}
	}
}

//              
public class AliveTest {
	public static void main(String[] args) {

		Thread thread = new Thread(new ThreadMe());
		
		//      
		System.out.println(thread.isAlive());//             。
		
		//    
		thread.start();
		for(int i=0;i<100;i++){
			System.out.println(thread.isAlive());
		}
	}
}

class ThreadMe implements Runnable {

	public void run() {
		System.out.println("hello world");
	}

}

//         ,      ......
public class JoinTest {
	public static void main(String[] args) throws InterruptedException {
		My my=new My();
		my.start();
		System.out.println("hello");//main     ，       Join  ，   ...
		my.join();//       。
		System.out.println("hello world");
	}
}

class My extends Thread{
	@Override
	public void run(){
		for(int i=0;i<10;i++){
			try {
				System.out.println("my thread"+i);
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
}