《面试题》写2个线程，其中一个线程打印1-52，另一个线程打印A-Z，打印顺序应该是12A34B56C...5152Z.

 

package com.ping.concurrent;
//资源类
class Print{
    //设置条件保证先打印数字
    private boolean flag = true;
    //这个是要打印数字的起始
    private int number = 0;

    public synchronized void printNumber() throws InterruptedException {
        if (!flag){
            this.wait();
        }
        for (int i = 0; i < 2 ; i++) {

            System.out.print(++number+"\t");
        }
        flag = false;
        this.notify();
    }

    public synchronized void printAZ(int i) throws InterruptedException {
        if (flag){
            this.wait();
        }
        System.out.print((char) ('A'+i)+"\t");
        flag = true;
        this.notify();
    }
}
/**
 * @Auther: ping.cheng.yu
 * @Date: 2018/8/1/001 21:17
 * @Description:
 */
public class NotifyWait {

    public static void main(String[] args) {

        Print print = new Print();

        new Thread(new Runnable() {
            @Override
            public void run() {
                for (int i = 0 ;i < 26;i ++){
                    try {
                        print.printNumber();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
        new Thread(new Runnable() {
            @Override
            public void run() {
                for (int i = 0 ;i < 26;i ++){
                    try {
                        print.printAZ(i);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
    }
}