实现接口的枚举类
1.和普通 Java 类一样,枚举类可以实现一个或多个接口
2.若每个枚举值在调用实现的接口方法呈现相同的行为方式,则只要统一实现该方法即可。
3.若需要每个枚举值在调用实现的接口方法呈现出不同的行为方式,则可以让每个枚举值分别来实现该方法
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情况一:实现接口,在enum类中实现抽象方法
public class SeasonTest01 {
public static void main(String[] args) {
Season1 winter = Season1.valueOf("WINTER");
System.out.println(winter);
winter.show();
}
}
interface Info{
void show();
}
//使用enum关键词枚举类
enum Season1 implements Info{
//1.提供当前枚举类的多个对象,多个对象之间用“,“隔开,末尾对象";"结束
SPRING ("春天","春暖花开"),
SUMMER ("夏天","夏日炎炎"),
AUTUMN ("秋天","秋高气爽"),
WINTER ("冬天","冰天雪地");
//2.声明Season对象的属性:private final修饰
private final String seasonName;
private final String seasonDesc;
//3.私有化类的构造器,并给对象属性赋值
private Season1(String seasonName,String seasonDesc){
this.seasonName = seasonName;
this.seasonDesc = seasonDesc;
}
//4.其他诉求1:获取枚举类对象的属性
public String getSeasonName() {
return seasonName;
}
public String getSeasonDesc() {
return seasonDesc;
}
@Override
public void show() {
System.out.println("这是一个季节");
}
//4.其他诉求1:提供toString()
// @Override
// public String toString() {
// return "Season1{" +
// "seasonName='" + seasonName + '\'' +
// ", seasonDesc='" + seasonDesc + '\'' +
// '}';
// }
}
如果我们希望每一个对象调用的show()展现不一样的内容
情况二:让枚举类的对象分别实现接口中的抽象方法
public class SeasonTest01 {
public static void main(String[] args) {
Season1 summer = Season1.SUMMER;
//toString():
System.out.println(summer);
//System.out.println(Season1.class.getSuperclass());
System.out.println("===================================");
//values():
Season1[] values = Season1.values();
for (int i = 0; i < values.length; i++) {
System.out.println(values[i]);
values[i].show();
}
System.out.println("=======================================");
//valuesOf(String objName):返回枚举类中对象名是objName的对象
//如果没有objName的枚举类对象,则抛异常:IllegalArgumentException
Season1 winter = Season1.valueOf("WINTER");//WINTER1报错
System.out.println(winter);
winter.show();
}
}
interface Info{
void show();
}
//使用enum关键词枚举类
enum Season1 implements Info{
//1.提供当前枚举类的多个对象,多个对象之间用“,“隔开,末尾对象";"结束
SPRING ("春天","春暖花开"){
@Override
public void show() {
System.out.println("春天在哪里");
}
},
SUMMER ("夏天","夏日炎炎"){
@Override
public void show() {
System.out.println("宁静的夏天");
}
},
AUTUMN ("秋天","秋高气爽"){
@Override
public void show() {
System.out.println("秋天不回来");
}
},
WINTER ("冬天","冰天雪地"){
@Override
public void show() {
System.out.println("大约在冬季");
}
};
//2.声明Season对象的属性:private final修饰
private final String seasonName;
private final String seasonDesc;
//3.私有化类的构造器,并给对象属性赋值
private Season1(String seasonName,String seasonDesc){
this.seasonName = seasonName;
this.seasonDesc = seasonDesc;
}
//4.其他诉求1:获取枚举类对象的属性
public String getSeasonName() {
return seasonName;
}
public String getSeasonDesc() {
return seasonDesc;
}
//4.其他诉求1:提供toString()
// @Override
// public String toString() {
// return "Season1{" +
// "seasonName='" + seasonName + '\'' +
// ", seasonDesc='" + seasonDesc + '\'' +
// '}';
// }
}
运行结果如下:
感谢观看!!!