DECLARE_ENUM(FileAccess) Read = 0x1, Write = 0x2,END_ENUM()DECLARE_ENUM(FileShare) Read = 0x1, Write = 0x2,END_ENUM() 。
6.请帮我写一个java 枚举类型的典型例子,谢谢public class T {
public static void main(String[] args){
int a=4,b=2;
//依次计算 4 和 2 +-*/ 产生的结果;
for(int i=0; iE e=E.values()[i];
int v=e.calc(4,2);
System.out.println(a+e.op()+b+"="+v);
}
}
}
//加减乘除的枚举
enum E{
ADD {
int calc(int a, int b) {return a+b;}
String op(){return "+";}
},
SUBTRACT {
int calc(int a, int b) {return a-b;}
String op(){return "-";}
},
MULTIPLY {
int calc(int a, int b) {return a*b;}
String op(){return "*";}
},
DIVIDE {
int calc(int a, int b) {return a/b;}
String op(){return "/";}
};
abstract int calc(int a,int b);
abstract String op();
}
-------编译输出--------
D:\>javac T.java
D:\>java T
4+2=6
4-2=2
4*2=8
4/2=2
D:\>
7.介绍一下java枚举,顺便举个例子,谢谢package com.ljq.test;/** * 枚举用法详解 * * @author jiqinlin * */ public class TestEnum { /** * 普通枚举 * * @author jiqinlin * */ public enum ColorEnum { red, green, yellow, blue; } /** * 枚举像普通的类一样可以添加属性和方法,可以为它添加静态和非静态的属性或方法 * * @author jiqinlin * */ public enum SeasonEnum { //注:枚举写在最前面,否则编译出错 spring, summer, autumn, winter; private final static String position = "test"; public static SeasonEnum getSeason() { if ("test".equals(position)) return spring; else return winter; } } /** * 性别 * * 实现带有构造器的枚举 * * @author jiqinlin * */ public enum Gender{ //通过括号赋值,而且必须带有一个参构造器和一个属性跟方法,否则编译出错 //赋值必须都赋值或都不赋值,不能一部分赋值一部分不赋值;如果不赋值则不能写构造器,赋值编译也出错 MAN("MAN"), WOMEN("WOMEN"); private final String value; //构造器默认也只能是private,从而保证构造函数只能在内部使用 Gender(String value) { this.value = http://www.xuexi88.com/zhishi/value; } public String getValue() { return value; } } /** * 订单状态 * * 实现带有抽象方法的枚举 * * @author jiqinlin * */ public enum OrderState { /** 已取消 */ CANCEL {public String getName(){return"已取消";}},/** 待审核 */ WAITCONFIRM {public String getName(){return "待审核";}},/** 等待付款 */ WAITPAYMENT {public String getName(){return "等待付款";}},/** 正在配货 */ ADMEASUREPRODUCT {public String getName(){return "正在配货";}},/** 等待发货 */ WAITDELIVER {public String getName(){return "等待发货";}},/** 已发货 */ DELIVERED {public String getName(){return "已发货";}},/** 已收货 */ RECEIVED {public String getName(){return "已收货";}}; public abstract String getName(); } public static void main(String[] args) { //枚举是一种类型,用于定义变量,以限制变量的赋值;赋值时通过“枚举名.值”取得枚举中的值 ColorEnum colorEnum = ColorEnum.blue; switch (colorEnum) { case red: System.out.println("color is red"); break; case green: System.out.println("color is green"); break; case yellow: System.out.println("color is yellow"); break; case blue: System.out.println("color is blue"); break; } //遍历枚举 System.out.println("遍历ColorEnum枚举中的值"); for(ColorEnum color : ColorEnum.values()){ System.out.println(color); } //获取枚举的个数 System.out.println("ColorEnum枚举中的值有"+ColorEnum.values().length+"个"); //获取枚举的索引位置,默认从0开始 System.out.println(ColorEnum.red.ordinal());//0 System.out.println(ColorEnum.green.ordinal());//1 System.out.println(ColorEnum.yellow.ordinal());//2 System.out.println(ColorEnum.blue.ordinal());//3 //枚举默认实现了java.lang.Comparable接口 System.out.println(ColorEnum.red.compareTo(ColorEnum.green));//-1 //-------------------------- System.out.println("==========="); System.err.println("季节为" + SeasonEnum.getSeason());//-------------- System.out.println("==========="); for(Gender gender : Gender.values()){ System.out.println(gender.value); } //-------------- System.out.println("==========="); for(OrderState order : OrderState.values()){ System.out.println(order.getName()); } } } 。