java中创建线程的的几种方式

1，继承自Thread类，代码逻辑写在子线程中，需要重写run()方法，主线程里start()就可以了

package com.myjava.thread;

public class ExtendsThread extends Thread{
    private final static int THREAD_NUM = 5;
    
    public static void main(String[] args){
        for (int i = 0; i <THREAD_NUM; i++) {
            new ExtendsThread("thread"+i).start();
        }
    }    
    public  ExtendsThread(String name){
        super(name);
    }
    @Override
    public void run() {
        // TODO Auto-generated method stub
        for (int i = 0; i < this.THREAD_NUM; i++) {
            System.out.println(this.getName()+i);
        }
    }
}

运行结果：

thread00
thread01
thread02
thread03
thread04
thread20
thread21
thread22
thread23
thread24
thread40
thread41
thread42
thread43
thread44
thread10
thread11
thread12
thread13
thread14
thread30
thread31
thread32
thread33
thread34

2，实现Runnable接口

package com.myjava.thread;



public class ImplRunnable implements Runnable {
    private static final int THREAD_NUM = 5;
    @Override
    public void run() {
        for (int i = 0; i < THREAD_NUM; i++) {
            System.out.println(Thread.currentThread().getName()+i);
        }
    }
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        for (int j = 0; j < THREAD_NUM; j++) {
            ImplRunnable  implRunnable= new ImplRunnable();
            new Thread(implRunnable,"thread"+j).start();
        }
    }
}

运行结果

thread10
thread11
thread12
thread13
thread14
thread30
thread31
thread32
thread33
thread34
thread00
thread01
thread02
thread03
thread04
thread20
thread21
thread22
thread23
thread24
thread40
thread41
thread42
thread43
thread44

3，通过线程池

package com.myjava.thread;

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

public class ThreadPool {
    private  static int POOL_NUM = 10;
    public static void main(String[] agrs){
        ExecutorService executorService = Executors.newFixedThreadPool(5);
        for (int i = 0; i < POOL_NUM; i++) {
            RunnableThread thread = new RunnableThread();
            executorService.execute(thread);
        }
    }
}
class RunnableThread implements  Runnable{
    private   int THREAD_NUM = 10;
    public void run() {
        for (int i = 0; i <THREAD_NUM; i++) {
            System.out.println("线程"+Thread.currentThread()+i);
        }
        
    }
}

-----

线程Thread[pool-1-thread-2,5,main]0
线程Thread[pool-1-thread-2,5,main]1
线程Thread[pool-1-thread-2,5,main]2
线程Thread[pool-1-thread-2,5,main]3
线程Thread[pool-1-thread-2,5,main]4
线程Thread[pool-1-thread-2,5,main]5
线程Thread[pool-1-thread-2,5,main]6
线程Thread[pool-1-thread-2,5,main]7
线程Thread[pool-1-thread-2,5,main]8
线程Thread[pool-1-thread-2,5,main]9
线程Thread[pool-1-thread-4,5,main]0
线程Thread[pool-1-thread-4,5,main]1
线程Thread[pool-1-thread-4,5,main]2
线程Thread[pool-1-thread-4,5,main]3
线程Thread[pool-1-thread-4,5,main]4
线程Thread[pool-1-thread-4,5,main]5
线程Thread[pool-1-thread-4,5,main]6
线程Thread[pool-1-thread-4,5,main]7
线程Thread[pool-1-thread-4,5,main]8
线程Thread[pool-1-thread-4,5,main]9
线程Thread[pool-1-thread-4,5,main]0
线程Thread[pool-1-thread-4,5,main]1
线程Thread[pool-1-thread-4,5,main]2
线程Thread[pool-1-thread-4,5,main]3
线程Thread[pool-1-thread-4,5,main]4
线程Thread[pool-1-thread-4,5,main]5
线程Thread[pool-1-thread-4,5,main]6
线程Thread[pool-1-thread-4,5,main]7
线程Thread[pool-1-thread-4,5,main]8
线程Thread[pool-1-thread-4,5,main]9
线程Thread[pool-1-thread-1,5,main]0
线程Thread[pool-1-thread-1,5,main]1
线程Thread[pool-1-thread-1,5,main]2
线程Thread[pool-1-thread-1,5,main]3
线程Thread[pool-1-thread-1,5,main]4
线程Thread[pool-1-thread-1,5,main]5
线程Thread[pool-1-thread-1,5,main]6
线程Thread[pool-1-thread-1,5,main]7
线程Thread[pool-1-thread-1,5,main]8
线程Thread[pool-1-thread-1,5,main]9
线程Thread[pool-1-thread-5,5,main]0
线程Thread[pool-1-thread-5,5,main]1
线程Thread[pool-1-thread-5,5,main]2
线程Thread[pool-1-thread-5,5,main]3
线程Thread[pool-1-thread-5,5,main]4
线程Thread[pool-1-thread-5,5,main]5
线程Thread[pool-1-thread-5,5,main]6
线程Thread[pool-1-thread-5,5,main]7
线程Thread[pool-1-thread-5,5,main]8
线程Thread[pool-1-thread-5,5,main]9
线程Thread[pool-1-thread-3,5,main]0
线程Thread[pool-1-thread-3,5,main]1
线程Thread[pool-1-thread-3,5,main]2
线程Thread[pool-1-thread-3,5,main]3
线程Thread[pool-1-thread-3,5,main]4
线程Thread[pool-1-thread-3,5,main]5
线程Thread[pool-1-thread-3,5,main]6
线程Thread[pool-1-thread-3,5,main]7
线程Thread[pool-1-thread-3,5,main]8
线程Thread[pool-1-thread-3,5,main]9
线程Thread[pool-1-thread-2,5,main]0
线程Thread[pool-1-thread-2,5,main]1
线程Thread[pool-1-thread-2,5,main]2
线程Thread[pool-1-thread-2,5,main]3
线程Thread[pool-1-thread-2,5,main]4
线程Thread[pool-1-thread-2,5,main]5
线程Thread[pool-1-thread-2,5,main]6
线程Thread[pool-1-thread-2,5,main]7
线程Thread[pool-1-thread-2,5,main]8
线程Thread[pool-1-thread-2,5,main]9
线程Thread[pool-1-thread-2,5,main]0
线程Thread[pool-1-thread-2,5,main]1
线程Thread[pool-1-thread-2,5,main]2
线程Thread[pool-1-thread-2,5,main]3
线程Thread[pool-1-thread-2,5,main]4
线程Thread[pool-1-thread-2,5,main]5
线程Thread[pool-1-thread-2,5,main]6
线程Thread[pool-1-thread-2,5,main]7
线程Thread[pool-1-thread-2,5,main]8
线程Thread[pool-1-thread-2,5,main]9
线程Thread[pool-1-thread-2,5,main]0
线程Thread[pool-1-thread-2,5,main]1
线程Thread[pool-1-thread-2,5,main]2
线程Thread[pool-1-thread-2,5,main]3
线程Thread[pool-1-thread-2,5,main]4
线程Thread[pool-1-thread-2,5,main]5
线程Thread[pool-1-thread-2,5,main]6
线程Thread[pool-1-thread-2,5,main]7
线程Thread[pool-1-thread-2,5,main]8
线程Thread[pool-1-thread-2,5,main]9
线程Thread[pool-1-thread-2,5,main]0
线程Thread[pool-1-thread-2,5,main]1
线程Thread[pool-1-thread-2,5,main]2
线程Thread[pool-1-thread-2,5,main]3
线程Thread[pool-1-thread-2,5,main]4
线程Thread[pool-1-thread-2,5,main]5
线程Thread[pool-1-thread-2,5,main]6
线程Thread[pool-1-thread-2,5,main]7
线程Thread[pool-1-thread-2,5,main]8
线程Thread[pool-1-thread-2,5,main]9