PATH1("/home/acer/logs1"),
PATH2("/home/acer/logs2"),
PATH3("/home/acer/logs3"),
PATH4("/home/acer/logs4")
private String path
Path(String path) {
this.path = path
}
public String getPath() {
return path
}
//测试方法
public static void main(String[] args) {
System.out.println(Path.PATH1.getPath())
System.out.println(Path.PATH2.getPath())
System.out.println(Path.PATH3.getPath())
System.out.println(Path.PATH4.getPath())
}
}
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 = 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())
}
}
}
