java多线程编程之一（start和run的区别）

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java多线程的start和run方法的区别

代码MyRunnable：



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package thread;

public class MyRunnable implements Runnable{
  private int i;
  
  public MyRunnable(int i){
    super();
    this.i = i;    
  }
  
  @Override
  public void run() {
    // TODO Auto-generated method stub
    System.out.println("MyRunnable is running...");
  }
  
}

代码MyThreadTest:



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package thread;

public class MyThreadTest {
  public static void main(String[] args) {
    MyRunnable runnable = new MyRunnable(1);
    //thread0.run();
    
    Thread thread1 = new Thread(runnable);
    thread1.start();
    
    System.out.println("main is running...");
    
  }
}

运行MyThreadTest返回结果如下：



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main is running...
MyRunnable is running...

Thread运行的原理图

java线程运行原理

  1. Thread调用start方法，之后会调用start0()，start0()是native方法，调用JVM中JVM_startThread，之后调用vmSymbolHandles的run_method_name，最后回回调Thread中的run方法。

  • 调用顺序如下

    

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      >MainThread
  >>Thread.start()
  >>>Thread.start0()
  >>>>JVM中JVM_startThread()
  >>>>>vmSymbolHandles的run_method_name
  >>>>>>Thread.run()

版权声明：自由转载-非商用-非衍生-保持署名 lonpo 本文永久链接: http://lonpo.github.io/java/java-thread-start-run-method/
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