java - 当我们需要实现 Runnable 以及子类 Thread 时的场景

Question

嗨，我最近发现一个博客，其中指出:

Sometimes you may have to implement Runnable as well as subclass Thread. For instance, if creating a subclass of Thread that can execute more than one Runnable. This is typically the case when implementing a thread pool.

我不确定这个说法指的是什么场景。

你能帮我理解这种情况吗？

谢谢。

Answer 1

检查此链接:"implements Runnable" vs. "extends Thread"

正如乔恩·斯基特所说:

In practical terms, it means you can implement Runnable and extend from another class as well.

示例:

public class Worker extends Person implements Runnable {...}

您引用的内容是您实际上需要使用线程的子类来实现更复杂的机制。例如。您实现一个可以执行多个任务的线程。

public SimpleExecutionService extends Thread() {

    private List<Runnable> myTasks;

    public SimpleExecutionService(List<Runnable> tasks){
        myTasks = tasks;
    }
    public void run() {
        for(Runnable task: myTasks) {
            task.run();
        }
    }

顺便说一下，这种并发机制已经存在很多了。