多线程使用

  1. 创建子线程并运行
public class ThreadTest {  
    private static class MyTestThread extends Thread {  
        @Override  
        public void run() {  
            System.out.println("MyTestThread run");  
        }  
    }  
  
    public static void main(String[] args) {  
        new MyTestThread().start();  
    }  
}

问题：1. 没有多继承，只能继承Thread类；2. 任务和线程没有分离，当多个线程需要执行同一个任务时，需要多份任务代码 解决办法：改用Runnable

  1. 使用Runnable
private static class MyTask implements Runnable {
	@Override
	public void run() {
		System.out.println("threadName="+Thread.currentThread().getName() + "：MyTestThread run");
	}
}
public static void main(String[] args) {  
    MyTask myTask = new MyTask();  
    new Thread(myTask).start();  
    new Thread(myTask).start();  
}

问题：无法获取返回值 解决办法：使用FutureTask

  1. 使用FutureTask
private static class MyCall implements Callable<Integer> {
	@Override
	public Integer call() throws Exception {
		return 1314;
	}
}
public static void main(String[] args) {
	FutureTask<Integer> integerFutureTask = new FutureTask<>(new MyCall());
	new Thread(integerFutureTask).start();
	try {
		Integer result = integerFutureTask.get();
		System.out.println(result);
	} catch (InterruptedException e) {
		throw new RuntimeException(e);
	} catch (ExecutionException e) {
		throw new RuntimeException(e);
	}
}

线程通知与等待

[[多线程编程]]