C#代码： 利用扩展方法，扩展枚举功能
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq; namespace EnumExtension
{
// Define an extension method in a non-nested static class.
public static class Extensions
{
public static Grades minPassing = Grades.D;
public static bool Passing(this Grades grade)
{
return grade >= minPassing;
}
} public enum Grades { F = , D=, C=, B=, A= };
class Program
{
static void Main(string[] args)
{
Grades g1 = Grades.D;
Grades g2 = Grades.F;
Console.WriteLine("First {0} a passing grade.", g1.Passing() ? "is" : "is not");
Console.WriteLine("Second {0} a passing grade.", g2.Passing() ? "is" : "is not"); Extensions.minPassing = Grades.C;
Console.WriteLine("\r\nRaising the bar!\r\n");
Console.WriteLine("First {0} a passing grade.", g1.Passing() ? "is" : "is not");
Console.WriteLine("Second {0} a passing grade.", g2.Passing() ? "is" : "is not");
}
}
}
}
/* Output:
First is a passing grade.
Second is not a passing grade. Raising the bar! First is not a passing grade.
Second is not a passing grade.
*/
Java代码：
package com.mmb.csharp; /**
* 颜色枚举
*
*/
public enum Color { /**
* 1
*/
RED("红色", 1),
/**
* 2
*/
GREEN("绿色", 2),
/**
* 3
*/
BLACK("黑色", 3),
/**
* 4
*/
YELLOW("黄色", 4); // 成员变量
private String name;
private int index; // 构造方法
private Color(String name, int index) {
this.name = name;
this.index = index;
} // 普通方法
public static String getName(int index) {
for (Color c : Color.values()) {
if (c.getIndex() == index) {
return c.name;
}
}
return null;
} public static Color getColor(int index) {
for (Color c : Color.values()) {
if (c.getIndex() == index) {
return c;
}
}
return null;
} // get set 方法
public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public int getIndex() {
return index;
} public void setIndex(int index) {
this.index = index;
}
}
单单只着眼于枚举，Java要比C#做的好一些、要更加地方便使用。