线程两种的实现方式

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线程实现的两种方式

1. 继承的方式

package org.shareing.mythread;

/**
 * 继承方式实现线程
 */
public class Test001 extends Thread{

    public void run(){
        System.out.println("进入 run 方法了。。。");
    }

    public static void main(String[] args) {
        Test001 test001 = new Test001();
        /*
        和 test001.run()区别是：
        1.start 是开启了一个新的线程，新的空间，有自己的计数器。
        2.直接调用run方法，是在主线程中运行，没有开启新的线程。
         */
        test001.start();
    }

}

1.1 start 启动和 run 的区别

package org.shareing.mythread;

import java.util.Random;

/**
 * 继承方式实现线程
 */
public class ExtendsFunction002 extends Thread{

    String flag;

    public ExtendsFunction002(String flag){
        this.flag=flag;
    }

    public void run(){
        System.out.println("进入 run 方法了。。。");
        String name = Thread.currentThread().getName();
        Random random = new Random();
        try {
            for (int i=0;i<20;i++){
                System.out.println(name+"......"+flag);
                Thread.sleep(random.nextInt(10)*100);
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }

    public static void main(String[] args) {
        ExtendsFunction002 test001 = new ExtendsFunction002("a");
        ExtendsFunction002 test002 = new ExtendsFunction002("b");
        test001.start();
        test002.start();
    }

}

测试结果：两个线程交替进行打印结果

进入 run 方法了。。。
进入 run 方法了。。。
Thread-0......a
Thread-1......b
Thread-1......b
Thread-1......b
Thread-0......a
Thread-0......a
Thread-0......a
Thread-1......b
Thread-1......b
Thread-0......a
Thread-0......a
Thread-0......a
Thread-0......a
Thread-1......b
Thread-1......b
Thread-1......b
Thread-1......b
Thread-0......a
Thread-0......a
Thread-1......b
Thread-0......a
Thread-1......b
Thread-1......b
Thread-0......a
Thread-1......b
Thread-1......b
Thread-1......b
Thread-0......a
Thread-1......b
Thread-0......a
Thread-1......b
Thread-1......b
Thread-1......b
Thread-0......a
Thread-1......b
Thread-0......a
Thread-0......a
Thread-0......a
Thread-0......a
Thread-0......a

改成run方法执行的测试结果：线程都是main方法，并且顺序执行

进入 run 方法了。。。
main......a
main......a
main......a
main......a
main......a
main......a
main......a
main......a
main......a
main......a
main......a
main......a
main......a
main......a
main......a
main......a
main......a
main......a
main......a
main......a
进入 run 方法了。。。
main......b
main......b
main......b
main......b
main......b
main......b
main......b
main......b
main......b
main......b
main......b
main......b
main......b
main......b
main......b
main......b
main......b
main......b
main......b
main......b

Process finished with exit code 0

2. 通过实现runnable 实现线程

package org.shareing.mythread;

/**
 * 通过实现runnable接口，实现线程
 */
public class ImplRunable001 implements Runnable {

    int x;

    public ImplRunable001(int x) {
        this.x = x;
    }

    @Override
    public void run() {
        String name = Thread.currentThread().getName();
        System.out.println("线程"+name+"开始执行");
        try{
            for (int i=0;i<10;i++){
                System.out.println(x);
                Thread.sleep(100);
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Thread thread001 = new Thread(new ImplRunable001(1));
        Thread thread002 = new Thread(new ImplRunable001(2));
        thread001.start();
        thread002.start();
    }
}

实验结果

线程Thread-0开始执行
1
线程Thread-1开始执行
2
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1

Process finished with exit code 0