问题描述

java怎么用多线程并发运行for?

如果把下面的改成十个线程并发运行不同的for语句，，就我最下面写好的那个方法，参数用定义好的数组里面的十个int变量,请问要怎么写？

 public static void main(String[] args) {
            for(Thread t:getThreads()){
                t.start();
            }
        }
        public static Thread[] getThreads(){
            Thread[] thread = new Thread[10];
            for(int i=0;i<10;i++){
                final Integer num = new Integer(i);
                thread[i] = new Thread(new Runnable(){
                    public void run() {
                        int j=5;
                        while(j-->0){
                            System.out.println("this is thread"+num);
                        }
                    }
                });
            }
            return thread;
        }

        public static void  bbq(int a){
            for(int b=a;b<a+2;b++){
                System.out.println("for循环"+"起始值为"+a+"终止值为"+(a+2));
            }
            }

解决方案

 for(Thread t:getThreads()){
                t.start();
            }
                        因为线程执行时间太短了，用循环模拟不出效果来。
                        改成下面的方式
    Thread[] thread =getThreads()   ;
    thread[0].start();
    thread[1].start();
    thread[2].start();
    thread[3].start();
    thread[4].start();

解决方案二：

 public class MyThread extends Thread{
    private int num = 0;
    public MyThread(Integer num){
        this.num = num;
    }
    public void run(){
        bbq(num);
    }
    public static MyThread[] getThreads(){
        MyThread[] thread = new MyThread[10];
        for(int i=0;i<10;i++){
            thread[i] = new MyThread(i);
        }
        return thread;
    }

    public static void  bbq(int a){
        for(int b=a;b<a+2;b++){
            System.out.println("for循环"+"起始值为"+a+"终止值为"+(a+2));
        }
    }
    public static void main(String[] args) {
        for(Thread t:getThreads()){
            t.start();
        }
    }

}