一 : 自定义枚举类
class Season{
//1.提供类的属性,声明为private, final
private final String seasonName;
private final String seasonDesc;
//2.声明为final的属性,在构造器中初始化
private Season(String seasonName,String seasonDesc) {
this.seasonName = seasonName;
this.seasonDesc = seasonDesc;
}
//3.通过公共方法来调用属性
public String getSeasonName() {
return seasonName;
}
public String getSeasonDesc() {
return seasonDesc;
}
//4.创建枚举类的对象
public static final Season SPRING = new Season("春天", "春天来了");
public static final Season SUMMER = new Season("夏天", "夏天来了");
public static final Season AUTUMN = new Season("秋天", "秋天来了");
public static final Season WINTER = new Season("冬天", "冬天来了");
@Override
public String toString() {
return "Season [seasonName=" + seasonName + ", seasonDesc=" + seasonDesc + "]";
}
public void show(){
System.out.println("hellow");
}
}
枚举类调用
public static void main(String[] args) {
Season spring = Season.SPRING;
System.out.println(spring);
spring.show();
}
二 : 使用enum关键字定义枚举类
让枚举类实现接口: 可以让不同的枚举类的对象调用被重写的抽象方法,执行的效果不同,相当于让每个对象重写抽象方法.
//枚举类
enum Season1 implements info{
SPRING("春天", "春天来了"){
public void show() {
System.out.println("111");
}
},
SUMMER("夏天", "夏天来了"){
public void show() {
System.out.println("222");
}
},
AUTUMN ("秋天", "秋天来了"){
public void show() {
System.out.println("333");
}
},
WINTER("冬天", "冬天来了"){
public void show() {
System.out.println("444");
}
};
private final String seasonName;
private final String seasonDesc;
private Season1(String seasonName,String seasonDesc) {
this.seasonName = seasonName;
this.seasonDesc = seasonDesc;
}
public String getSeasonName() {
return seasonName;
}
public String getSeasonDesc() {
return seasonDesc;
}
@Override
public String toString() {
return "Season [seasonName=" + seasonName + ", seasonDesc=" + seasonDesc + "]";
}
// public void show(){
// System.out.println("hellow");
//
// }
}
使用values 获取枚举值
Season1 spring = Season1.SPRING;
Season1[] seasons = Season1.values();
for (int i = 0; i < seasons.length; i++) {
System.out.println(seasons[i]);
}
打印结果
Season [seasonName=春天, seasonDesc=春天来了]
Season [seasonName=夏天, seasonDesc=夏天来了]
Season [seasonName=秋天, seasonDesc=秋天来了]
Season [seasonName=冬天, seasonDesc=冬天来了]
使用valueOf(String name)
要求传入的形参name是枚举类对象的名,否则报java.lang.IllegalArgumentException异常
String str = "SPRING";
Season1 sea = Season1.valueOf(str);
System.out.println(sea);
打印结果
Season [seasonName=春天, seasonDesc=春天来了]
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