{"id":499,"date":"2020-06-19T10:21:16","date_gmt":"2020-06-19T02:21:16","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=499"},"modified":"2020-06-19T16:25:55","modified_gmt":"2020-06-19T08:25:55","slug":"%e6%9e%9a%e4%b8%be%e7%b1%bb%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=499","title":{"rendered":"\u679a\u4e3e\u7c7b\u578b"},"content":{"rendered":"\n

\u679a\u4e3e\u7c7b\u578b\uff0c\u6211\u4e00\u76f4\u4f7f\u7528\u7684\u5c11\uff0c\u770b\u4e86\u4e00\u7bc7\u6587\u7ae0\uff0c\u5176\u4e2d\u6709\u8bf4\u4f7f\u7528\u679a\u4e3e\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u7684\uff0c\u611f\u89c9\u633a\u6709\u610f\u601d\u7684\u3002<\/p>\n\n\n\n

\u539f\u6587\uff1ahttps:\/\/mp.weixin.qq.com\/s\/U5FkL9zyzr0PkAp8MJJ8BQ<\/a><\/p>\n\n\n\n

\u8fd8\u53ef\u4ee5\u7ed3\u5408\u8fd9\u4e00\u7bc7\u770b\u770b\uff0c\u7406\u89e3\u4f1a\u66f4\u6df1\u5165https:\/\/blog.csdn.net\/u011277123\/article\/details\/104523638?utm_medium=distribute.pc_relevant.none-task-blog-baidujs-1<\/a><\/p>\n\n\n\n

\u4ee5\u56db\u5b63\u4e3e\u4f8b\u5b50\uff0c\u5982\u679c\u8981season\u4e2d\u5b9a\u4e49\u6625\u590f\u79cb\u51ac\uff0c4\u4e2a\u5e38\u91cf\uff0c\u63d0\u4f9b\u6253\u5370\u5f53\u524d\u5b63\u8282\u548c\u4e0b\u4e2a\u5b63\u8282\u7b49\u65b9\u6cd5\uff0c\u52bf\u5fc5\u9700\u8981\u5199\u4e0d\u5c11if else\u3002\u8fd9\u4e2a\u65f6\u5019\u53ef\u4ee5\u4f7f\u7528enum\u7c7b\u578b<\/p>\n\n\n\n

public enum Season {
    SPRING(0), SUMMER(1), AUTUMN(2), WINTER(3);

    private int value;

    private Season(int value){
        this.value = value;
    }

    public static Season getNextSeason(Season nowSeason){
        int nextDayValue = nowSeason.value;
        if(++nextDayValue == 3){
            nextDayValue = 0;
        }
        return getSeasonByValue(nextDayValue);
    }

    public static Season getSeasonByValue(int value){
        for(Season s : Season.values()){
            if(s.value == value){
                return s;
            }
        }
        return null;
    }
}
class Test{
    public static void main(String[] args){
        System.out.println(\"nowSeason->\"+Season.SPRING+\", value->\"+Season.SPRING.ordinal());
        System.out.println(\"nextSeason->\"+Season.getNextSeason(Season.SPRING));
    }
}<\/pre>\n\n\n\n
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\u56e0\u4e3aenum\u7c7b\u578b\u5b9e\u73b0\u65f6\u5019\u662f\u7ee7\u627fEnum\u7c7b\u578b\uff0c\u5e76\u4e14\u662ffinal\u7684\uff0c\u5176\u4e2d\u6240\u6709\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u4e5f\u662fstatic\u7684\uff0c\u6240\u4ee5\u4fdd\u8bc1\u4e86enum\u7c7b\u578b\u4f7f\u7528\u65f6\u5019\u7684\u7ebf\u7a0b\u5b89\u5168\u6027\u3002\u53ea\u5728\u521d\u59cb\u5316\u65f6\u5019\u521b\u5efa\u4e00\u6b21\u3002\u6240\u4ee5\u662f\u7528\u6765\u505a\u5355\u4f8b\u63a7\u5236\u7684\u597d\u529e\u6cd5\u3002<\/p>\n\n\n\n
public class SingletonObject {

    private SingletonObject() {
    }

    private enum Singleton {
        INSTANCE;

        private final SingletonObject instance;

        Singleton() {
            instance = new SingletonObject();
        }

        private SingletonObject getInstance() {
            return instance;
        }
    }

    public static SingletonObject getInstance() {
        return Singleton.INSTANCE.getInstance();
    }
}
<\/pre>\n\n\n\n
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