创建多线程的方式

创建多线程有三种方式来创建：
1.继承Thread类
2.实现Runnable接口
3.使用Executor框架来创建线程池

一.继承Thread类

package com.test;

/**
 * Created by admin on 2017/6/5 10:16.
 *
*/
public class DemoThread extends Thread {
private String name;

 DemoThread(String name) {
this.name = name;
 }

 @Override
public void run() {
for (int i = 0; i < 40; i++) {
 System.out.println(name + ":" + i);
 }
 }

public static void main(String[] args) {
new DemoThread("线程1").start();
new DemoThread("线程2").start();
new DemoThread("线程3").start();
 }
}

二.实现Runnable接口

package com.test;

/**
 * Created by admin on 2017/6/5 10:16.
*/
public class DemoThread implements Runnable {

 @Override
public void run() {
for (int i = 0; i < 40; i++) {
 System.out.println(Thread.currentThread().getName() + ":" + i);
 }
 }

public static void main(String[] args) {
 DemoThread d1 = new DemoThread();
 Thread t1 = new Thread(d1, "线程1");
 Thread t2 = new Thread(d1, "线程2");
 Thread t3 = new Thread(d1, "线程3");
 t1.start();
 t2.start();
 t3.start();
 }
}

 三.使用线程池创建

package com.test;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * Created by admin on 2017/6/5 10:16.
*/
public class DemoThread {
public static void main(String[] args) {
//固定大小的线程池,如果线程数量大于固定值,多的线程则会等待
        ExecutorService pool = Executors.newFixedThreadPool(3);
 pool.execute(() -> {
for (int i = 0; i < 40; i++) {
 System.out.println("线程1:" + i);
 }
 });
 pool.execute(() -> {
for (int i = 0; i < 40; i++) {
 System.out.println("线程2:" + i);
 }
 });
 pool.execute(() -> {
for (int i = 0; i < 40; i++) {
 System.out.println("线程3:" + i);
 }
 });
 }

}