枚举理解

package com.ming.test;/* * 枚举理解： * enum都继承了Enum类，在创建Enum对象时都会调用Enum中默认的构造方法 *  protected Enum(String name, int ordinal)； * 创建枚举类的两种形式： *  MON, TUE, WED, THU, FRI, SAT, SUN;// 默认的构造函数protected Enum(String name, int ordinal) *  RED(255, 0, 0);//调用完默认的构造函数protected Enum(String name, int ordinal)，继续调用当前枚举类的构造函数 */public enum EnumT {    MON, TUE, WED, THU, FRI, SAT, SUN;// 默认的构造函数protected Enum(String name, int ordinal)    public static void main(String[] args) {        System.out.println(EnumT.MON.ordinal());        System.out.println(EnumT.MON);    }}enum Color {    RED(255, 0, 0), BLUE(0, 0, 255), BLACK(0, 0, 0), YELLOW(255, 255, 0), GREEN(0, 255, 0);    // 构造枚举值，比如RED(255,0,0)    private Color(int rv, int gv, int bv) {        this.redValue = rv;        this.greenValue = gv;        this.blueValue = bv;    }    private Color(String rv, int gv, int bv) {        this.greenValue = gv;        this.blueValue = bv;    }    public String toString() { // 覆盖了父类Enum的toString()        return super.toString() + "(" + redValue + "," + greenValue + "," + blueValue + ")";    }    private int redValue; // 自定义数据域，private为了封装。    private int greenValue;    private int blueValue;    public static void main(String[] args) {        Enum a = Color.RED;        System.out.println(Color.RED.redValue);    }}