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java枚举的几种写法

关键词: java enum

java枚举的几种写法

```
public enum Color {

_,
    RED,
    GREEN,
    BLUE,
    ;

}

public enum Color2 {

RED {
        @Override
        public String getColor() {
            return "红色";
        }
    },

GREEN {
        @Override
        public String getColor() {
            return "绿色";
        }
    },

BLUE {
        @Override
        public String getColor() {
            return "蓝色";
        }
    };

public abstract String getColor();

}

public enum Color3 {

RED(1, "红色"),

GREEN(2, "绿色"),

BLUE(3, "蓝色");

public int i;

public String name;

Color3(int i, String name) {
        this.i = i;
        this.name = name;
    }

}
```

```
public class Test {

public static void main(String[] args) {
        System.out.println(Color.valueOf("RED"));
        Color[] array = Color.values();
        for (Color item : array) {
            System.out.println("--start--");
            System.out.println(item);
            System.out.println(item.name());
            System.out.println(item.ordinal());
            System.out.println("--end--");
        }
    }

}

public class Test2 {

public static void main(String[] args) {
        Color2[] array = Color2.values();
        for (Color2 item : array) {
            System.out.println("--start--");
            System.out.println(item);
            System.out.println(item.name());
            System.out.println(item.ordinal());
            System.out.println(item.getColor());
            System.out.println("--end--");
        }
    }

}

public class Test3 {

public static void main(String[] args) {
        System.out.println(Color3.RED.i);
        System.out.println(Color3.RED.name);
    }

}
```

```
import java.util.HashMap;

public enum DemoEnum {

JAVA("1", "Java"),
    GOLANG("2", "Golang"),
    ;

private String code;

private String name;

DemoEnum(String code, String name) {
        this.code = code;
        this.name = name;
    }

public String getCode() {
        return this.code;
    }

public String getName() {
        return this.name;
    }

/*
        一定要定义成静态的
    */
    public static HashMap<String, String> getMap() {
        HashMap<String, String> map = new HashMap<>();
        for (DemoEnum item : DemoEnum.values()) {
            map.put(item.getCode(), item.getName());
        }
        return map;
    }

}
```

admin
2021-09-23 20:05:26
phantoscope

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java枚举的几种写法