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java-Thread start()和Runnable run()有什么区别

(java - What's the difference between Thread start() and Runnable run())

发布于 2011-12-20 17:47:37

假设我们有以下两个Runnable:

class R1 implements Runnable {
    public void run() { … }
}

class R2 implements Runnable {
    public void run() { … }
}

那么这之间有什么区别:

public static void main() {
    R1 r1 = new R1();
    R2 r2 = new R2();

    r1.run();
    r2.run();
}

和这个:

public static void main() {
    R1 r1 = new R1();
    R2 r2 = new R2();
    Thread t1 = new Thread(r1);
    Thread t2 = new Thread(r2);

    t1.start();
    t2.start();
}
Questioner
Ori Popowski
Viewed
11
5,879 2019-05-18 19:03:16

第一个示例:没有多个线程。两者都在单个(现有)线程中执行。没有线程创建。

R1 r1 = new R1();
R2 r2 = new R2();

r1r2只是实现Runnable接口并因此实现run()方法的类的两个不同对象调用时,r1.run()你正在当前线程中执行它。

第二个示例:两个单独的线程。

Thread t1 = new Thread(r1);
Thread t2 = new Thread(r2);

t1并且t2是该类的对象Thread当你调用时t1.start(),它将启动一个新线程并在内部调用该run()方法r1以在该新线程中执行方法