两线程交替打印单双数

创建A,B两个线程交替打印1-100，A线程打印单数，B线程打印双数

 

package com.advance.code.learn.day0226;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

/**
 * 两个线程交替打印 1-100的数
 */
public class TurnedPrintThread {

    public static void main(String[] args) {

        PrinterHandler printerHandler = new PrinterHandler();

        new Thread(() -> {
            for (int i = 1; i <= 100; i += 2) {
                printerHandler.printer(i, true);
            }
        }, "AAAAAA").start();

        new Thread(() -> {
            for (int i = 2; i <= 100; i += 2) {
                printerHandler.printer(i, false);
            }
        }, "BBBBBB").start();

    }

}

class PrinterHandler{
    //用于标记当前线程 true是A线程  flag是B线程
    private boolean flag = true;
    private ReentrantLock lock = new ReentrantLock();
    Condition condition1 = lock.newCondition();
    Condition condition2 = lock.newCondition();

    public void printer(int num, boolean flagThread){
        lock.lock();
        try {
            while (flagThread != flag){
                if(flagThread){
                    condition1.await();
                }else{
                    condition2.await();
                }
            }

            System.out.println(Thread.currentThread().getName() + "打印：\t"+num);

            if(flagThread){
                flag = false;
                condition2.signal();
            }else{
                flag = true;
                condition1.signal();
            }

        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
}