2个线程向同一数组中加随机数，每个数组加3个数，交替

package com.heima.lei;
import java.util.Random;

public class Test01 {
    /**implements Runnable synchronized * 2个线程向同一数组中加随机数，每个数组加3个数，交替 * @param args */
    public static void main(String[] args) {
        ThreadArray ta = new ThreadArray();
        Thread t1 = new Thread(ta);
        Thread t2 = new Thread(ta);
        t1.setName("第一个线程");
        t2.setName("第二个线程");
        t1.start();
        t2.start();
    }

}
class ThreadArray implements Runnable{
    private static int []arr = new int [6];
    int j=0;
    //int sum = 0;
    @Override
    public void run() {
        for(int i = 0;i < 3;i ++){
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {

                e.printStackTrace();
            }
            AddArray();
        }
    }

    public synchronized void AddArray() {
        Random r = new Random();
        int num = r.nextInt(100);
        arr[j] = num;
        System.out.println(Thread.currentThread().getName()+"arr["+j+"]="+num);
        j++;
    }

}