java两个线程交替打印1-100之间的数字

package com.test.thread.test;

public class ThreadTest {
    public static final Object lock = new Object();

    static class A implements Runnable {
        public void run() {
            for (int i = 1; i <= 100; i++) {
                synchronized (lock) {
                    if (i % 2 == 0) {
                        System.out.println(i);
                    } else {
                        try {
                            lock.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    lock.notify();
                }
            }
        }
    }

    static class B implements Runnable {
        public void run() {
            for (int i = 1; i <= 100; i++) {
                synchronized (lock) {
                    if (i % 2 == 1) {
                        System.out.println(i);
                    } else {
                        try {
                            lock.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }

                    lock.notify();
                }
            }
        }
    }
    public static void main(String[] args) {
        new Thread(new A()) {
        }.start();

        new Thread(new B()) {
        }.start();
    }
}