Java 枚举使用范例

package com.sp.eclipse;

public class demo3 {
    //枚举使用范例
    public static void main(String[] args) {
        int grade = 100, grade2 = 75;
        String rString = Grade.getName(grade);//传入分数，输出分数说明
        System.out.println("分数："+ grade + "分----"+rString);

        String rString2 = Grade.getName(grade2);//传入分数，输出分数说明
        System.out.println("分数："+ grade2 + "分----"+rString2);
    }

    //枚举法定义分数等级说明
    public enum Grade {
        A("优秀", 90, 100), B("良好", 80, 89), C("及格", 60, 79), D("不及格", 0, 59);
        private String name;
        private int min, max;
        
        //构建函数
        private Grade(String name, int min, int max) {
            this.name = name;
            this.min = min;
            this.max = max;
        }
        
        //普通方法
        public static String getName(int grade) {
            String rString ="" ;
            for (Grade g : Grade.values()) {
                if (grade >= g.getMin() && grade <= g.getMax()) {
                    rString =  g.getName() + g.toString();
                }
            }
            return rString;
        }
        
        @Override//重写toString方法
        public String toString() {
            return "（等级:" + getName() + "----分数区间:" + getMin() + "~" + getMax() + ")";
        }
        
        //以下是字段属性读取设置
        public String getName() {
            return name;
        }

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

        public int getMin() {
            return min;
        }

        public void setMin(int min) {
            this.min = min;
        }

        public int getMax() {
            return max;
        }

        public void setMax(int max) {
            this.max = max;
        }
    }
}