Java 对多线程的理解

淡淡的烟草味﹌ 2022-12-27 01:23 219阅读 0赞

对两种多线程的对比：

// Runnable 就是一个接口，Thread类实现了Runnable，Runnable存在解决只能单继承Thread的问题。  
//因为Thread也实现了Runnable接口 且Runnable接口中只存在一个Run方法  
// 因此，无论是implements Runnable还是 extendsThread都要实现run方法  
// 只是如果是直接继承Thread类，当我们调用多线程的时候可以直接.start()  
// 如果是通过实现Runnable接口，那么需要实例化Thread类来调用.start()

// Runnable 接口更适合于多个线程处理统一资源

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NfbGFueGlhb2Zhbmc_size_16_color_FFFFFF_t_70][]

1、直接继承Thread类

package com.temp;
    
    /**
     * @Author lanxiaofang
     * @email 983770299@qq.com
     * @date 2020/12/5 13:08
     */
    public class P205_07_Thead{
        public static void main(String[] args) {
            TestThread testThread1 = new TestThread("1");
            TestThread testThread2 = new TestThread("2");
            testThread1.start();
            testThread2.start();
            System.out.println("main is ending");
        }
    }
    
    class TestThread extends Thread{
        private String name;
        public TestThread(String name){
            this.name = name;
        }
    
        @Override
        public void run() {
            for (int i  = 0;i<5;i++){
                try {
                    sleep((int)(1000*Math.random()));
                } catch (InterruptedException interruptedException) {
                    interruptedException.printStackTrace();
                    System.out.println(interruptedException);
                }
                System.out.println(name + " is Running "+i);
            }
        }
    }

2、实现Runnable接口

package com.temp;
    
    /**
     * @Author lanxiaofang
     * @email 983770299@qq.com
     * @date 2020/12/5 14:35
     */
    public class P207_08_Runnablr {
        public static void main(String[] args) {
            TestThread2 testThread2 = new TestThread2("testThread2");
            TestThread2 testThread21 = new TestThread2("testThread21");
            Thread thread1 = new Thread(testThread2);
            Thread thread2 = new Thread(testThread21);
            thread1.start();
            thread2.start();
        }
    }
    
    class TestThread2 implements Runnable{
    
        private String name;
        public TestThread2(String name){
            this.name = name;
        }
    
        @Override
        public void run() {
            for (int i=0;i<5;i++){
                try {
                    Thread.sleep((int)(1000*Math.random()));
                } catch (InterruptedException interruptedException) {
                    interruptedException.printStackTrace();
                    System.out.println(interruptedException);
                }
                System.out.println(name+" is running "+i);
            }
        }
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NfbGFueGlhb2Zhbmc_size_16_color_FFFFFF_t_70]: /images/20221120/01b186b308214b2fb21bfc3226660395.png