1、传统线程创建回顾

1、直接使用Thread新建线程

package com.yzl;

public class ThreadPart_1 {
    
    //直接使用Thread对象新建线程并重run方法
    public void test1(){
        Thread thread1 = new Thread(){
            @Override
            public void run() {
                super.run();
                for(int i=1; i<=10; i++){
                    System.out.println("Thread：" + Thread.currentThread().getName() + ",value is：" + i);
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        };
        thread1.start();
    }
    
    public static void main(String[] args) {
        System.out.println("Main Thread：" + Thread.currentThread().getName() + " is run ");
        ThreadPart_1 test = new ThreadPart_1();
        test.test1();
    }
}

运行结果：

Main Thread：main is run 
Thread：Thread-0,value is：1
Thread：Thread-0,value is：2
Thread：Thread-0,value is：3
Thread：Thread-0,value is：4
Thread：Thread-0,value is：5
Thread：Thread-0,value is：6
Thread：Thread-0,value is：7
Thread：Thread-0,value is：8
Thread：Thread-0,value is：9
Thread：Thread-0,value is：10

2、使用Runnable接口新建线程（从面向对象的角度这方法更好）

//使用Runnable接口新建线程
    public void test2(){
        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                for(int i=1; i<=10; i++){
                    System.out.println("Thread：" + Thread.currentThread().getName() + ",value is：" + i);
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        });
        thread.start();
    }
    
    public static void main(String[] args) {
        System.out.println("Main Thread：" + Thread.currentThread().getName() + " is run ");
        ThreadPart_1 test = new ThreadPart_1();
        test.test2();
    }

运行结果：

Main Thread：main is run 
Thread：Thread-0,value is：1
Thread：Thread-0,value is：2
Thread：Thread-0,value is：3
Thread：Thread-0,value is：4
Thread：Thread-0,value is：5
Thread：Thread-0,value is：6
Thread：Thread-0,value is：7
Thread：Thread-0,value is：8
Thread：Thread-0,value is：9
Thread：Thread-0,value is：10

3、有趣一个测试

//有趣的测试
    public void test3(){
        Thread thread = new Thread(
            new Runnable() {
                @Override
                public void run() {
                    System.out.println("Runnable run method is runing~~~");
                }
            }
        ){
            @Override
            public void run() {
                System.out.println("Thread run method is runing~~~");
            }
        };
        thread.start();
    }
    
    public static void main(String[] args) {
        System.out.println("Main Thread：" + Thread.currentThread().getName() + " is run ");
        ThreadPart_1 test = new ThreadPart_1();
        test.test3();
    }

运行结果：

Main Thread：main is run 
Thread run method is runing~~~

原因：

但是上面这run方法运行的前提是没有人去重写该方法，而我们上面的代码却重写了，导致上面这图片中的代码无法运行，故运行的是thread的run方法。