implements Runnable synchronized代码块 * 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;

import javax.swing.plaf.SliderUI;

public class Test02 {

/**implements Runnable   synchronized代码块
* 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) {
Thread t1 = new ThreadArray2();
Thread t2 = new ThreadArray2();
t1.setName("第一个线程：");
t2.setName("第二个线程：");
t1.start();
t2.start();
}

}
class ThreadArray2 extends Thread {
private static final int []arr = new int [20];
private static int j=0;
public void run(){
for(int i = 0;i < 3 ;i++){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {

e.printStackTrace();
}
try {
AddArray();
} catch (InterruptedException e) {

e.printStackTrace();
}
}
}

public  void AddArray() throws InterruptedException {
synchronized (ThreadArray2.class) {
Random r = new Random();
int num = r.nextInt(100);
arr[j] = num;
System.out.println(Thread.currentThread().getName()+"arr["+j+"]="+num);
j++;

}
}

}