线程交替输入，打印

package com.thread;

/**
 * @author a
 * @date 2021/3/16 7:58
 * @description
 */
public class Test4 {
    static Thread t1 = null, t2 = null;
    public static void main(String[] args) {
        char[] number = "123456789".toCharArray();
        char[] letter = "ABCDEFGHI".toCharArray();
        Object o = new Object();
        t1 = new Thread(new Runnable() {
            @Override
            public void run() {
                synchronized (o) {
                    for (char c : number) {
                        System.out.println(c);
                        try {
                            o.notify();
                            o.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    o.notify();
                }
                /*for (char c : number) {
                    System.out.println(c);
                    LockSupport.unpark(t2);
                    LockSupport.park();
                }*/
            }
        }, "t1");

        t2 = new Thread(new Runnable() {
            @Override
            public void run() {
                synchronized (o) {
                    for (char c : letter) {
                        System.out.println(c);
                        try {
                            o.notify();
                            o.wait();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                    o.notify();
                }
                /*for (char c : letter) {
                    LockSupport.park();
                    System.out.println(c);
                    LockSupport.unpark(t1);
                }*/
            }
        }, "t2");

        t1.start();
        t2.start();
        System.out.println("=====================");
    }
}