网站建设会遇到哪些问题,电商运营怎么做数据分析,网址导航网站简单制作,临沂有哪几家做网站的Java中thread的start()和run()的区别#xff1a;1.start#xff08;#xff09;方法来启动线程#xff0c;真正实现了多线程运行#xff0c;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的代码#xff1a;通过调用Thread类的start()方法来启动一个线程#xff…Java中thread的start()和run()的区别1.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是处于就绪状态并没有运行。然后通过此Thread类调用方法run()来完成其运行操作的这里方法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终止而CPU再运行其它线程2.run方法当作普通方法的方式调用程序还是要顺序执行还是要等待run方法体执行完毕后才可继续执行下面的代码而如果直接用Run方法这只是调用一个方法而已程序中依然只有主线程--这一个线程其程序执行路径还是只有一条这样就没有达到写线程的目的。举例说明一下记住线程就是为了更好地利用CPU提高程序运行速率的public class TestThread1{public static void main(String[] args){Runner1 rnew Runner1();//r.run();//这是方法调用而不是开启一个线程Thread tnew Thread(r);//调用了Thread(Runnable target)方法。且父类对象变量指向子类对象。t.start();for(int i0;i100;i){System.out.println(进入Main Thread运行状态);System.out.println(i);}}}class Runner1 implements Runnable{ //实现了这个接口jdk就知道这个类是一个线程public void run(){for(int i0;i100;i){System.out.println(进入Runner1运行状态);System.out.println(i);}}}同时摘取一段外文网站论坛上的解释Why do we need start() method in Thread class? In Java API description for Thread class is written : Java Virtual Machine calls the run method of this thread...Couldnt we call method run() ourselves, without doing double call: first we call start() method which calls run() method? What is a meaning to do things such complicate?There is some very small but important difference between using start() and run() methods. Look at two examples below:Example one:Code:Thread one new Thread();Thread two new Thread();one.run();two.run();Example two:Code:Thread one new Thread();Thread two new Thread();one.start();two.start();The result of running examples will be different.In Example one the threads will run sequentially: first, thread number one runs, when it exits the thread number two starts.In Example two both threads start and run simultaneously.Conclusion: the start() method call run() method asynchronously (does not wait for any result, just fire up an action), while we run run() method synchronously - we wait when it quits and only then we can run the next line of our code.
