package cn.yw.thread.practice;import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;/*** 多线程练习：* 1.开启一个线程打印1～52，开启另一个线程打印A～Z* 打印方式：12A34B46C依次打印* @author yw-tony**/
public class PracticeTest {public static void main(String[] args){final DataPrint data = new DataPrint();//打印字母的线程(大家也可以把这两个线程抽取出来作为两个单独的类，这里为了实现简单我就直接写在main方法中了)new Thread(new Runnable(){@Overridepublic void run() {while(data.letterFlag){data.printLetter();}}}).start();//打印数字的线程new Thread(new Runnable(){@Overridepublic void run() {while(data.numFlag){data.printNun();}}}).start();}/*** 打印类* @author yw-tony**/static class DataPrint{public boolean letterFlag = true;//线程结束标记;public boolean numFlag = true;//数字的初始值int num = 1;//字母的初始值//这里A~Z的字母对应的阿拉伯数字为65～90，int letter = 65;//线程等待标记boolean flag = true;//java线程并发库中的锁相当与（synchronized）Lock lock = new ReentrantLock();//线程并发库中用于线程之间通讯的类相当于wait(),notify()Condition condLetter = lock.newCondition();Condition condNum = lock.newCondition();/*** 打印字字母的方法**/public void printLetter(){//如果打印到Z则结束线程并停止if(letter > 90 ){letterFlag = false;return ;} //锁定代码块，锁定时其他线程不能访问其中内容
            lock.lock();try{if(flag){//如果执行打印数字的线程正在执行，则该线程进入等待状态
                    condLetter.await();}System.out.println(Thread.currentThread().getName()+":"+(char)letter);letter++;Thread.sleep(100);//打印执行完成，唤醒打印数字的线程flag = true;condNum.signal();}catch(Exception e){e.printStackTrace();}finally{//解锁当前代码快
                lock.unlock();}}/*** 打印数字的方法*/public void printNun(){//如果打印到52则结束线程并停止if(num > 52){numFlag = false;return;}lock.lock();try{if(!flag){condNum.await();}System.out.println(Thread.currentThread().getName()+":"+num);num++;System.out.println(Thread.currentThread().getName()+":"+num);num++;Thread.sleep(100);flag = false;condLetter.signal();//唤醒打印字母的线程}catch(Exception e){e.printStackTrace();}finally{lock.unlock();}}}
}