Java笔记（六）多线程

线程

/**
 *实现线程的第一种方法
 *继承线程 
 *重写run方法
 */

public class ThreadDemo extends Thread{

    //重写run方法
    @Override
    public void run() {
        for(int i = 0;i < 5;i++){
            try {
                //休眠2秒
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(i);
        }
    }

    public static void main(String[] args) {
        //运行线程只需要两步
        //1：new一个线程
        ThreadDemo t = new ThreadDemo();
        //2：运行线程
        t.start();
    }
}

实现接口Runnable

/**
 * 实现接口Runnable
 * implements Runnable
 */
public class ThreadDemo4 implements Runnable{

    //重写run方法
    @Override
    public void run() {
        for(int i = 0;i < 5;i++){
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(i);
        }
    }
    public static void main(String[] args) {
        ThreadDemo4 demo4 = new ThreadDemo4();
        new Thread(demo4).start();
    }
}

匿名内部类创建多线程

public class ThreadDemo3 {

    public static void anonymity(){
        //匿名内部类
        Thread t = new Thread(new Runnable(){

            @Override
            public void run() {
                for (int i = 0; i < 5; i++) {
                    try {
                        Thread.sleep(2000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
        System.out.println(Thread.currentThread().getName()+","+i);
        //              System.out.println(i);
                }
            }
        });
        t.start();
    }

外部类创建多线程

    //外部类
    static class InnerDemo3 implements Runnable{
        @Override
        public void run() {
            for(int i = 0;i < 5;i++){
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println(i);
            }
        }
    }
    public static void exterior(){
        InnerDemo3 id = new InnerDemo3();
        Thread t = new Thread(id);
        t.start();
    }

匿名内部类和外部类的主方法

    public static void main(String[] args) {
        anonymity();
        exterior();
    }
}