Java中枚举在生产中的常见用法

深藏阁楼爱情的钟 2023-07-09 06:24 11阅读 0赞

首先枚举的入门请参考博客 [java枚举入门][java]

最近在学习JUC中的countdownlatch时做练习[Java并发之CountDownLatch、CyclicBarrier、Semaphore使用实例][Java_CountDownLatch_CyclicBarrier_Semaphore]，用到枚举，需要六个国家。代码如下：

**枚举**

/**
     * 枚举 枚举在生产中的使用
     */
    public enum CountryEnum {
    
        One("齐", 1), two("楚", 2),
        three("燕", 3), four("韩", 4), five("赵", 5), six("魏", 6);
    
        @Getter
        private String retMessage;
        @Getter
        private int retCode;
    
        CountryEnum(String message, int code) {
            this.retCode = code;
            this.retMessage = message;
        }
    
        public static CountryEnum forEach_CountryEnum(int index) {
            CountryEnum[] enums = CountryEnum.values();
            for (CountryEnum countryEnum : enums) {
                if (countryEnum.getRetCode() == index) {
                    return countryEnum;
                }
            }
            return null;
        }
    }

**使用**

/**
     * @ClassName: CountDownLatchDemo
     * @description:
     * @author: XZQ
     * @create: 2020/2/28 8:27
     **/
    public class CountDownLatchDemo {
    
        public static void main(String[] args) throws InterruptedException {
            CountDownLatch countDownLatch = new CountDownLatch(6);
            for (int i = 1; i <= 6; i++) {
                new Thread(() -> {
                    System.out.println(Thread.currentThread().getName() + "\t国，被灭");
                    countDownLatch.countDown();
                }, CountryEnum.forEach_CountryEnum(i).getRetMessage()).start();
            }
            countDownLatch.await();
            System.out.println(Thread.currentThread().getName() + "\t 六国灭");                //System.out.println(CountryEnum.SIX);        //System.out.println(CountryEnum.SIX.getRetCode());        //System.out.println(CountryEnum.SIX.getRetMessage());     }
    
        }
    }

[java]: https://www.cnblogs.com/lmw97/p/11800333.html
[Java_CountDownLatch_CyclicBarrier_Semaphore]: https://blog.csdn.net/qq_42107430/article/details/103854488