run() 和 start() 的区别

1） start：

用start方法来启动线程，真正实现了多线程运行，这时无需等待run方法体代码执行完毕而直接继续执行下面（指主线程下面）的代码。通过调用Thread类的start()方法来启动一个线程，这时此线程处于就绪（可运行）状态，并没有运行，一旦得到cpu时间片，就开始执行run()方法，这里方法run()称为线程体，它包含了要执行的这个线程的内容，Run方法运行结束，此线程随即终止。

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并没有产生子线程，而是普通的方法调用，只有等调用方法执行完后，主线程才能继续执行处后面的代码。

总结：调用start方法方可启动线程，而run方法只是thread的一个普通方法调用，还是在主线程里执行。

参考：/article/4121305.html