0基础学java_枚举

枚举Enum

所谓的枚举就是规定好了指定的范围，所有的内容都是从指定的范围内取出。

举例：

package com.feimao.a1;


class Color {
    public static final Color RED = new Color("红色");
    public static final Color GREEN = new Color("绿色");
    public static final Color YELLOW = new Color("黄色");
    private String name;

    private Color(String name) {
        this.name = name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public static Color getInstance(int i) {
        switch (i) {
            case 1: {
                return RED;
            }
            case 2: {
                return GREEN;
            }
            case 3: {
                return YELLOW;
            }
            default: {
                return null;
            }
        }
    }
}

public class EnumDemo02 {
    public static void main(String args[]) {
        Color c1 = Color.RED;
        System.out.println(c1.getName());
        Color c2 = Color.getInstance(2);
        System.out.println(c2.getName());

    }

}

举例：枚举enum

enum Color{

       RED , GREEN ,YELLOW;

}

public class EnmuDemo01{

     public static void main(String args[]){

        Color c = Color.GREEN;

        System.out.println(c);

         }

     }