微信搜索《Java鱼仔》,每天一个知识点不错过
(一)每天一个知识点
如何让多个线程按顺序执行?
(二)结论
1.主线程中使用join 2.子线程中使用join 3.使用单一化线程池
(三)再多学一点
我们都知道线程的执行顺序是无序的,但是有的时候我们希望线程按顺序执行该怎么做呢?我在下面提供了三种方式: 1.主线程中使用join
public static void main(String[] args) throws InterruptedException {
Thread a1=new Thread(new Runnable() {
@Override
public void run() {
System.out.println(Thread.currentThread().getName()+"打开冰箱");
}
});
Thread a2=new Thread(new Runnable() {
@Override
public void run() {
System.out.println(Thread.currentThread().getName()+"取出物品");
}
});
Thread a3=new Thread(new Runnable() {
@Override
public void run() {
System.out.println(Thread.currentThread().getName()+"关闭冰箱");
}
});
a1.start();
a1.join();
a2.start();
a2.join();
a3.start();
a3.join();
}
2.子线程中使用join
public static void main(String[] args) throws InterruptedException {
Thread a1=new Thread(new Runnable() {
@Override
public void run() {
System.out.println(Thread.currentThread().getName()+"打开冰箱");
}
});
Thread a2=new Thread(new Runnable() {
@Override
public void run() {
try {
a1.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+"取出物品");
}
});
Thread a3=new Thread(new Runnable() {
@Override
public void run() {
try {
a2.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+"关闭冰箱");
}
});
a1.start();
a2.start();
a3.start();
}
3.使用单一化线程池,单一化线程池一次只提供一个线程,相当于单线程的操作。
static ExecutorService service= Executors.newSingleThreadExecutor();
public static void main(String[] args) {
Thread a1=new Thread(new Runnable() {
@Override
public void run() {
System.out.println(Thread.currentThread().getName()+"打开冰箱");
}
});
Thread a2=new Thread(new Runnable() {
@Override
public void run() {
System.out.println(Thread.currentThread().getName()+"取出物品");
}
});
Thread a3=new Thread(new Runnable() {
@Override
public void run() {
System.out.println(Thread.currentThread().getName()+"关闭冰箱");
}
});
service.submit(a1);
service.submit(a2);
service.submit(a3);
}