/*** 为枚举类定义一个抽象方法，<br/>* 这个抽象方法由不同的枚举值提供不同的实现* * @author wangzhu* @date 2014-9-15下午5:35:04* */
public enum EnumOption {PLUS {@Overridepublic double eval(double x, double y) {return x + y;}},MINUS {@Overridepublic double eval(double x, double y) {return x - y;}},TIMES {@Overridepublic double eval(double x, double y) {return x * y;}},DIVIDE {@Overridepublic double eval(double x, double y) {return x / y;}};public abstract double eval(double x, double y);
}

public interface GenderDesc {void info();
}/*** 实现接口的枚举类* * @author wangzhu* @date 2014-9-15下午5:34:44* */
public enum EnumGender3 implements GenderDesc {MALE("男") {@Overridepublic void info() {System.out.println("男子标记");}},FEMALE("女") {@Overridepublic void info() {System.out.println("女子标记");}};private final String name;private EnumGender3(String name) {this.name = name;}public String getName() {return this.name;}
}

// 编译通过，运行异常，因为在switch的时候真正使用的是enumGender3.ordinal()而不是enumGender3EnumGender3 enumGender3 = null;switch (enumGender3) {case MALE:System.out.println("EnumGender1 男");break;case FEMALE:System.out.println("EnumGender1 女");break;default:System.out.println("EnumGender1 其他");break;}

package com.wangzhu.enumutil;/*** 应用枚举实现的工厂方法* * @author wangzhu* @date 2015-1-4下午4:36:07* */
public enum EnumFactory {Cat {@Overridepublic Animal create() {return new Cat();}},Dog {@Overridepublic Animal create() {return new Dog();}};public abstract Animal create();}class Animal {}class Cat extends Animal {}class Dog extends Animal {}