題目

寫兩個(gè)線程，一個(gè)線程打印1-52，另一個(gè)線程打印A-Z，打印順序?yàn)?2A34B56C......5152Z。要求用線程間的通信。
注：分別給倆個(gè)對(duì)象構(gòu)造一個(gè)對(duì)象O，數(shù)字每打印兩個(gè)或字母每打印一個(gè)就執(zhí)行O.wait().

代碼實(shí)現(xiàn)

package 第16章多線程.chapter16_09_ThreadLocal;

public class TestThread1 {
    public static void main(String[] args) {
        Object object = new Object();
        new Thread1(object).start();
        new Thread2(object).start();
    }
}

// 數(shù)字打印線程
class Thread1 extends Thread {
    private Object obj;
    public Thread1(Object obj) {
        this.obj = obj;
    }
    public void run() {
        synchronized (obj) {
            for (int i = 1; i <= 52; i++) {
                System.out.print(i);
                if (i % 2 == 0) {
                    obj.notifyAll();
                    //打印到能被 2 整除就等待
                    try {
                        obj.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
}

// 字母打印線程
class Thread2 extends Thread {
    private Object obj;

    public Thread2(Object obj) {
        this.obj = obj;
    }

    public void run() {
        synchronized (obj) {
            for (int i = 0; i < 26; i++) {
                System.out.print((char) ('A' + i));
                //打印一個(gè)字母就喚醒其他所有線程
                obj.notifyAll();
                try {
                    obj.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}