java两个线程打印奇数和偶数

最新推荐文章于 2025-03-24 16:56:10 发布

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最新推荐文章于 2025-03-24 16:56:10 发布

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分类专栏：算法题 java 文章标签： java 两个线程打印奇数偶数

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本文介绍如何设计两个Java线程，一个负责打印100以内的偶数，另一个打印奇数。线程间协作使得偶数线程每输出10个偶数后，切换到奇数线程打印10个奇数，以此类推。

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设计两个线程类，一个线程类负责打印100以内所有的偶数，另一个线程打印100以内所有的奇数。要求偶数线程每打印10个偶数以后，就让奇数线程打印10个奇数，如此交替进行。

public class TwoThreadPrint {
    public static void main(String[] args) {
        PrintBean bean = new PrintBean();
        for (int i = 0; i < 2; i++) {
            new Thread(new PrintTask(bean, "Thread" + String.valueOf(i+1) + ":")).start();
        }
    }

}

class PrintBean{
    private int count = 0;
    public int getCount(){
        return count;
    }
    public void nextCount(){
        count += 1;
    }
    public void setCount(int count){
        this.count = count;
    }
    public boolean isNotCompleted(){
        return count < 5;
    }

    boolean evenTurn = true;
}

class PrintTask implements Runnable{
    PrintBean two;
    String name;
    public PrintTask(PrintBean two, String name){
        this.two = two;
        this.name = name;
    }
    public void run() {
        while (two.isNotCompleted()) {
            synchronized (two) {
                printNum(two.getCount());
            }
            }
    }

    public void printNum(int startNum) {
        if (two.evenTurn) {
            for (int i = 20 * startNum; i < 20 * startNum + 20; i += 2) {
                System.out.println(name + i);
            }
            two.evenTurn = false;
            two.setCount(two.getCount() - 1);
        } else {
            for (int i = 20 * startNum + 1; i < 20 * startNum + 20; i += 2) {
                System.out.println(name + i);
                two.evenTurn = true;
            }
        }
        two.nextCount();
        two.notifyAll();
        try {
            two.wait();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }
}

结果如下：
Thread1:0
Thread1:2
Thread1:4
Thread1:6
Thread1:8
Thread1:10
Thread1:12
Thread1:14
Thread1:16
Thread1:18
Thread2:1
Thread2:3
Thread2:5
Thread2:7
Thread2:9
Thread2:11
Thread2:13
Thread2:15
Thread2:17
Thread2:19
Thread1:20
Thread1:22
Thread1:24
Thread1:26
Thread1:28
Thread1:30
Thread1:32
Thread1:34
Thread1:36
Thread1:38
Thread2:21
Thread2:23
Thread2:25
Thread2:27
Thread2:29
Thread2:31
Thread2:33
Thread2:35
Thread2:37
Thread2:39
Thread1:40
Thread1:42
Thread1:44
Thread1:46
Thread1:48
Thread1:50
Thread1:52
Thread1:54
Thread1:56
Thread1:58
Thread2:41
Thread2:43
Thread2:45
Thread2:47
Thread2:49
Thread2:51
Thread2:53
Thread2:55
Thread2:57
Thread2:59
Thread1:60
Thread1:62
Thread1:64
Thread1:66
Thread1:68
Thread1:70
Thread1:72
Thread1:74
Thread1:76
Thread1:78
Thread2:61
Thread2:63
Thread2:65
Thread2:67
Thread2:69
Thread2:71
Thread2:73
Thread2:75
Thread2:77
Thread2:79
Thread1:80
Thread1:82
Thread1:84
Thread1:86
Thread1:88
Thread1:90
Thread1:92
Thread1:94
Thread1:96
Thread1:98
Thread2:81
Thread2:83
Thread2:85
Thread2:87
Thread2:89
Thread2:91
Thread2:93
Thread2:95
Thread2:97
Thread2:99