[英]Running threads in sequence
假设下面有下面的类,如何强制依次依次执行三个线程? (等待对方终止)
public class MyRunnable implements Runnable{
@Override
public void run() {
System.out.println("Thread 1 :First Thread started");
}
public static Runnable delay(){
Runnable r = new Runnable(){
@Override
public void run() { // running state
System.out.println("Thread 2: loading second thread..");
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("Thread 2: System loaded");
}
}; // finished state
return r;
}
public static Runnable waiting(){
Runnable r = new Runnable(){
@Override
public void run() { // running state
System.out.println("Thread 3: waiting..");
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("Thread 3: OK");
}
}; // finished state
return r;
}
public static void main(String[] args) throws InterruptedException{
Thread thread1 = new Thread(new MyRunnable());
Thread thread2 = new Thread(delay());
Thread thread3 = new Thread(waiting()); // (initial state)
thread1.start();
thread2.start();
thread3.start();
}
}
是的,但是为什么要这么做?
public static void main(String[] args) throws InterruptedException{
Thread thread1 = new Thread(new MyRunnable());
Thread thread2 = new Thread(delay());
Thread thread3 = new Thread(waiting()); // (initial state)
thread1.start();
thread1.join();
thread2.start();
thread2.join();
thread3.start();
thread3.join();
}
其他方式(无线程):
public static void main(String[] args) throws InterruptedException{
new MyRunnable().run();
delay().run();
waiting().run();
}
您的代码执行以下操作:
Main thread thread-1 thread-2 thread-3
V
|
+ . . . . . . > V
+ . . . . . . . | . . . . . . > V
+ . . . . . . . | . . . . . . . | . . . . . . > V
X | | |
X | |
| |
X |
|
X
您要求这样做(因为线程可以并行化任务,并且您不想对其并行化,所以没有意义!):
Main thread thread-1 thread-2 thread-3
V
|
+ . . . . . . > V
| |
|<--------------X
+ . . . . . . . . . . . . . . > V
| |
| |
| |
| |
|<------------------------------X
+ . . . . . . . . . . . . . . . . . . . . . . > V
| |
| |
| |
| |
| |
| |
|<----------------------------------------------X
X
启动线程后,放入thread.join ()
。 这将等待线程返回,然后再开始下一个线程。
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