Java的多线程创建方法

1. 直接使用Thread来创建

package com.test.tt;

public class ThreadEx extends Thread{
    private int j;

    public void run(){
        for(j=0; j<100;j++){
            System.out.println("当前的线程名称是："+ getName() + " " +  "当前j的值是：" + j);
        }
    }

    public static void main(String[] args) {
        for(int h=0; h<100;h++){

            if(h==20){
                ThreadEx  threadTest1= new ThreadEx();
                ThreadEx  threadTest2= new ThreadEx();
                threadTest1.start();
                threadTest2.start();
            }

            System.out.println("当前的线程名称是："+ Thread.currentThread().getName() + " " +  "当前h的值是：" + h);

        }

    }

}

2. 通过实现Runnable接口，并将Runnable实现对象作为Thread的Target的方式创建

package com.test.tt;

public class RunnableEx implements Runnable{

    private int i;
    @Override
    public void run() {
        for(i=0; i<100;i++){
            System.out.println("当前的线程名称是："+ Thread.currentThread().getName() + " " +  "当前i的值是：" + i);
        }

    }

    public static void main(String[] args) {
        for(int j=0;j<100;j++){
            System.out.println("当前的线程名称是："+ Thread.currentThread().getName() + " " +  "当前i的值是：" + j);
            if(j==20){
                RunnableEx REx=new RunnableEx();
                Thread thread1 = new Thread(REx, "实例1");
                Thread thread2 = new Thread(REx, "实例2");
                thread1.start();
                thread2.start();
            }
        }

    }

}

3. 通过实现Callable接口的方式创建（这是一个具有返回值的创建方式）

package com.test.tt;

import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;

public class CallableEx implements Callable{
    @Override
    public Object call() throws Exception {
        int i =0;
        for(;i<1000;i++){
            System.out.println("当前的线程名称是："+ Thread.currentThread().getName() + " " +  "当前i的值是：" + i);
        }
        return i;
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        CallableEx CEx = new CallableEx();
        FutureTask<Integer> task = new FutureTask<Integer>(CEx);

        for(int j=0;j<1000;j++){
            System.out.println("当前的线程名称是："+ Thread.currentThread().getName() + " " +  "当前i的值是：" + j);
            if(j==200){
                Thread thread1 = new Thread(task, "实例1");
                thread1.start();
            }
        }

        try{
            System.out.println("线程的返回值：" + task.get());
        }catch(Exception ex){
            ex.printStackTrace();
        }
    }

}