多线程直接继承Thread类方式设计一个线程例子，在例子中构造4个线程对象实现对同一数据类对象进行操作(数据初始值为0)，其中线程对象1对数据执行+10的操作，线程对象2对数据执行+20的操作, 对象3对数据执行乘以3的操作，线程对象4对数据执行除以4的操作,请考虑线程同步，保证数据操作的正确性。请提供程序代码以及运行结果截图
https://blog.csdn.net/sd_zhangzheng/article/details/51932426
private volatile static int num = 0;
public static void main(String[] args) {
final CyclicBarrier ot2 = new CyclicBarrier(2);
final CyclicBarrier ot3 = new CyclicBarrier(2);
final CyclicBarrier ot4 = new CyclicBarrier(2);
Thread add10 = new Thread(new Runnable() {
public void run() {
try {
num += 10;
System.out.println(num);
ot2.await();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (BrokenBarrierException e) {
e.printStackTrace();
}
}
});
Thread add20 = new Thread(new Runnable() {
public void run() {
try {
ot2.await();
num += 20;
System.out.println(num);
ot3.await();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (BrokenBarrierException e) {
e.printStackTrace();
}
}
});
Thread multi3 = new Thread(new Runnable() {
public void run() {
try {
ot3.await();
num *= 3;
System.out.println(num);
ot4.await();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (BrokenBarrierException e) {
e.printStackTrace();
}
}
});
Thread devide4 = new Thread(new Runnable() {
public void run() {
try {
ot4.await();
num /= 4;
System.out.println(num);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (BrokenBarrierException e) {
e.printStackTrace();
}
}
});
devide4.start();
multi3.start();
add20.start();
add10.start();
try {
devide4.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(num);
}
