java 多线程 对象锁

package thread;

/**
 * 子线程循环 10 次，接着主线程循环 100 次，接着又回到子线程循环 10 次，接着再回到主线程又循环 100 次，如此循环50次
 */
public class Thread4Test {

    private static Object object=new Object();
    private static boolean endFlag=true;

    private static class ThreadMain extends Thread {
        ThreadChild threadChild = new ThreadChild();

        @Override
        public void run() {
            try {
                threadChild.start();

                for (int i = 1; i <= 50; i++) {
                    synchronized (object) {
                        object.wait();
                    }
                    for (int j = 0; j < 100; j++) {
                        System.out.println(j + 1 + "--主线程" + i);
                    }
                    synchronized (object) {
                        if(i==50) endFlag=false;
                            object.notify();
                    }
                }
            } catch (InterruptedException e) {
                //do something
            }
        }
    }


    private static class ThreadChild extends Thread {
        @Override
        public void run() {
            while (endFlag) {
                synchronized (object) {
                    for (int i = 0; i < 10; i++) {
                        System.out.println(i + 1 + "--子线程");
                    }
                    try {
                        object.notify();
                        object.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }

    public static void main(String[] args) {
        try {
            ThreadMain threadMain = new ThreadMain();
            threadMain.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}