Thread Future模式

Posted 2022-02-08 pickknow

多线程不管是extends Thread 还是 implements Runnable 都是要重写run 方法来实现，这两种方式子线程都没有返回值。

如果要实现主线程对子线程的监听，让子线程有返回值，可以用implememts Callable<T> 方式：

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class App6 
    public static void main(String[] args) throws Exception 
        ExecutorService newCachedThreadPool = Executors.newCachedThreadPool();
        Future<String> submit = newCachedThreadPool.submit(new TaskCallable());
        String result = submit.get(); //获取返回值
        System.out.println(result);
    



class TaskCallable implements Callable<String>
    @Override
    public String call() throws Exception 
        System.out.println(Thread.currentThread().getName());
        return "Hello World";