并发编程详细整理

Posted 2021-02-03 lingluo2017

 

 

一.线程状态的切换

5种

 

二.深入理解run()和start()

run方法就是普通对象的普通方法，只有调用了start()后，Java才会将线程对象和操作系统中实际的线程进行映射，再来执行run方法

package concurrent;
/**
 * start()和run()的区别
 */
public class StartAndRun {
    public static class ThreadRun extends Thread{

        @Override
        public void run() {
            int i = 90;
            while(i>0){
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                System.out.println("I am "+Thread.currentThread().getName()
                        +" and now the i="+i--);
            }
        }
    }

    public static void main(String[] args) {
        ThreadRun beCalled = new ThreadRun();
        beCalled.setName("BeCalled");
        beCalled.run();
        //beCalled.start();
    }
}

 运行结果：

放开start()，注释run()之后：