Java 4个线程交替打印0到400

Java 4个线程交替打印0到400

package learn_thread;

public class Demo6 {
    private static final int ThreadNum = 4;

    public static void main(String[] args) {
        CyclePrint cyclePrint = new CyclePrint();
        for (int i = 0; i < ThreadNum; i++) {
            final int curFlag = i;
            final int nextFlag = (curFlag + 1) % ThreadNum;
            new Thread(new Runnable() {
                @Override
                public void run() {
                    cyclePrint.print(curFlag, nextFlag, curFlag, ThreadNum);
                }
            }, "T" + curFlag).start();
        }
    }

}

class CyclePrint {
    private static int flag = 0;
    private static final int maxValue = 400;

    public void print(int curFlag, int nextFlag, int start, int threadNum) {
        for (int i = start; i <= maxValue; i += threadNum) {
            synchronized (this) {
                while (curFlag != flag) {
                    try {
                        wait();
                    } catch (InterruptedException e) {
                    }
                }
                System.out.println(Thread.currentThread().getName() + "-" + i);
                flag = nextFlag;
                notifyAll();
            }
        }
    }
}