线程

进程是一个静态的概念,线程是一个进程里面的不同的执行路径,一个cpu实际上每个时间点只能执行一个线程

  • (继承,重写,父类引用指向子类对象)
  • package com.site.line;
    
    public class TestLine {
        public static void main(String[] args) {
            m1();
        }
        public static void m1(){
            m2();
            m3();
    
        }
        public static void m2(){};
        public static void m3(){};
    }

    创建线程:

  • package com.site.line;
    
    public class StartLine {
        public static void main(String[] args) {
            Runner1 r = new Runner1();
            Thread t = new Thread(r);
            t.start();//调用start方法,线程启动
    
            for (int i=0;i<100;i++){
                System.out.println("Main Thread:----"+i);
            }
        }
    }
    //实现Runner接口
    class Runner1 implements  Runnable{
        @Override
        //实现run()方法
        public void run() {
            for (int i = 0; i <100 ; i++) {
                System.out.println("Runner1:"+i);
            }
        }
    }

    线程启动方法一:重写Runnable接口,实例化Thread对象再启动线程

  • package zrm;
    
    public class Threadl {
        /*thread*/
        public static void main(String[] args) {
            Runner1 runner1 = new Runner1();
            Thread thread = new Thread(runner1);
            thread.start();
            for (int ii = 0; ii < 1000; ii++) {
                System.out.println("this is the main thread:" + ii);
            }
        }
    }
    /*重写Runnable接口*/
    class Runner1 implements Runnable {
        @Override
        public void run() {
            for (int i = 0; i < 1000; i++) {
                System.out.println("this is runnale's run():" + i);
            }
        }
    }

    方法二:直接用一个子类继承Thread类,并且重写Thread的run()方法

  • package com.site.line;
    
    public class StartLine {
        public static void main(String[] args) {
            Runner1 r = new Runner1();
            r.start();//直接使用
            //Thread t = new Thread(r);//这里就不需要在new一个新的Thread对象
            //t.start();
    
            for (int i=0;i<100;i++){
                System.out.println("Main Thread:----"+i);
            }
        }
    }
    //实现Runner接口
    //class Runner1 implements  Runnable{
    class Runner1 extends Thread{
        //实现run()方法
        public void run() {
            for (int i = 0; i <100 ; i++) {
                System.out.println("Runner1:"+i);
            }
        }
    }

    线程的状态转换:

  •  

  • 线程的一些常用方法;
  •  

posted @ 2019-08-15 16:39  26417  阅读(135)  评论(0编辑  收藏  举报