java多线程轮流打印数字字母案例代码

Posted 2021-03-08

本案例演示3个线程轮流打印输出数字字母；代码如下

package thread;

public class ThreadTest {
    public static void main(String[] args) {
        Print print = new Print();
        new Thread(()->{
            print.printNum();
        }).start();

        new Thread(()->{
            print.printZimu();
        }).start();

        new Thread(()->{
            print.printZimuLittle();
        }).start();
    }
}

package thread;

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

public class Print {
    final Lock lock = new ReentrantLock();
    final Condition num = lock.newCondition();
    final Condition zimu = lock.newCondition();
    final Condition zimuLittle = lock.newCondition();

    public void printNum(){
        lock.lock();
        try {
            for (int i=1;i<53;i++){
                System.out.print(i);
                if (i%2==0){
                    zimu.signal();
                    num.await();
                }
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void printZimu(){
        lock.lock();
        try {
            for (int i=0;i<26;i++){
                System.out.print((char)(i+‘A‘));
                zimuLittle.signal();
                zimu.await();
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void printZimuLittle(){
        lock.lock();
        try {
            for (int i=0;i<26;i++){
                System.out.print((char)(i+‘a‘));
                num.signal();
                zimuLittle.await();
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}

最终输出结果为12aA34bB56cC78dD910eE1112fF1314gG1516hH1718iI1920jJ2122kK2324lL2526mM2728nN2930oO3132pP3334qQ3536rR3738sS3940tT4142uU4344vV4546wW4748xX4950yY5152zZ