枚举

1.枚举类定义

package com.cj.java5;

public class EnumTest {
    public static void main(String[] args) {
        Season spring = Season.SPRING;
        System.out.println(spring);
    }
}
enum Season{
    SPRING("春天","春暖花开"),
    SUMMER("夏天","烈日炎炎");
    private final String seasonName;
    private final String seasonDesc;

    Season(String seasonName, String seasonDesc) {
        this.seasonName = seasonName;
        this.seasonDesc = seasonDesc;
    }

    public String getSeasonName() {
        return seasonName;
    }

    public String getSeasonDesc() {
        return seasonDesc;
    }
}
结果：SPRING

以前的定义方式：

package com.cj.java5;

public class EnumTest1 {
    public static void main(String[] args) {
        Season1 spring = Season1.SPRING;
        System.out.println(spring);
    }
}
class Season1{
    private final String seasonName;
    private final String seasonDesc;


    public static final Season1 SPRING = new Season1("春天","春暖花开");
    public static final Season1 SUMMER = new Season1("夏天","烈日炎炎");
    public Season1(String seasonName, String seasonDesc) {
        this.seasonName = seasonName;
        this.seasonDesc = seasonDesc;
    }

    public String getSeasonName() {
        return seasonName;
    }

    public String getSeasonDesc() {
        return seasonDesc;
    }
}

结果：com.cj.java5.Season1@6d6f6e28

 

 

 2.常用方法

public class EnumTest {
    public static void main(String[] args) {
        Season spring = Season.SPRING;
        System.out.println(spring);
        //遍历
        for (int i = 0; i < Season.values().length; i++) {
            System.out.println(Season.values()[i]);
        }
        //获取单个
        Season summer = Season.valueOf("SUMMER");
        System.out.println(summer);
        //toString
        System.out.println(summer.toString());
    }
}

 3.类的继承

package com.cj.java5;

/**
 * 三、常用方法
 *  values()
 *  valueof()
 *  toString()
 */

interface info{
    void show();
}
public class EnumTest {
    public static void main(String[] args) {
        Season spring = Season.SPRING;
        System.out.println(spring);
        //遍历
        for (int i = 0; i < Season.values().length; i++) {
            System.out.println(Season.values()[i]);
        }
        //获取单个
        Season summer = Season.valueOf("SUMMER");
        System.out.println(summer);
        //toString
        System.out.println(summer.toString());

        summer.show();
    }
}
enum Season implements info{
    SPRING("春天","春暖花开"){
        @Override
        public void show() {
            System.out.println("春天在哪里呀，春天在哪里呀");

        }
    },
    SUMMER("夏天","烈日炎炎"){
        @Override
        public void show() {
            System.out.println("夏天夏天悄悄过去，留下小秘密");
        }
    };
    private final String seasonName;
    private final String seasonDesc;

    Season(String seasonName, String seasonDesc) {
        this.seasonName = seasonName;
        this.seasonDesc = seasonDesc;
    }

    public String getSeasonName() {
        return seasonName;
    }

    public String getSeasonDesc() {
        return seasonDesc;
    }

}