java枚举实例

实例一：

public enum OrderOption {
ASC,
DESC;

}

实例二（带参数构造函数）：

public enum OrderOption {
ASC("ASC"),
DESC("DESC");
String type;

OrderOption(String type){
this.type = type;
}

public String getType() {
return type;
}

public void setType(String type) {
this.type = type;
}
}

实例三（枚举公共方法）：

public static void main(String[] args) {
System.out.println(SeasonEnum.getSeason("spring"));
}

public enum SeasonEnum {
spring, summer, autumn, winter;
public static SeasonEnum getSeason(String position) {
if ("spring".equals(position)){
return spring;
}else if("summer".equals(position)){
return winter;
}else if("autumn".equals(position)){
return autumn;
}else{
return winter;
}
}
}

实例四（带抽象方法的枚举）：

public static void main(String[] args) {
System.out.println(OrderState.A.aaa());
}

public enum OrderState {
A{
public String aaa(){
return "优";
}
},
B{
public String aaa(){
return "良好";
}
},
C{
public String aaa(){
return "及格";
}
};

public abstract String aaa();
}

实例五（综合实例）：

enum Grade{//class

A("100-90"){
public String localeValue(){
return "优";
}
},
B("89-80"){
public String localeValue(){
return "良";
}
},
C("79-70"){
public String localeValue(){
return "一般";
}
},
D("69-60"){
public String localeValue(){
return "差";
}
},
E("59-0"){
public String localeValue(){
return "不及格";
}
};//Object

private String value; //封装每个对象对应的分数
private Grade(String value){
this.value = value;
}

public String getValue(){
return this.value;
}
public abstract String localeValue();

}

记住：枚举中的抽象方法，在创建枚举的对象的时候要实现抽象方法。
测试：
[java]
package com.feng.myemu;

import org.junit.Test;

public class Demo1 {
@Test
public void test(){
print(Grade.B);
}

public void print(Grade g){
String value = g.localeValue();
System.out.println(value);
}
}