多线程03 线程中的静态代理

1、静态代理
角色分析

• 抽象接口

@FunctionalInterface
public interface Runnable {
    /**
     * When an object implementing interface <code>Runnable</code> is used
     * to create a thread, starting the thread causes the object's
     * <code>run</code> method to be called in that separately executing
     * thread.
     * <p>
     * The general contract of the method <code>run</code> is that it may
     * take any action whatsoever.
     *
     * @see     java.lang.Thread#run()
     */
    public abstract void run();
}

• 真实对象：

public class MyRunnable implements Runnable{
    public void run() {
        System.out.println("线程体");
    }
}

• 代理对象：代理真实角色，一般会有些附属操作

public class Thread implements Runnable {

    private Runnable target;

    public Thread(Runnable target) {
        init(null, target, "Thread-" + nextThreadNum(), 0);
    }

    public void run() {
        if (target != null) {
            target.run();
        }
    }

}

• 客户：访问代理对象的人

public class Test01 {
    public static void main(String[] args) {
        // 真实对象
        MyRunnable runnable = new MyRunnable();
        // 代理对象
        Thread thread = new Thread(runnable);
        thread.start();
    }
}

总结：由此可以看出，线程中用的是静态代理模式，Thread 就是代理类