public class EumnTest {
public static void main(String[] args) {
//这是自定义模仿的枚举类
System.out.println(Season.SPRING.getSeasonDesc()); //春暖花开
System.out.println(Season.SPRING.getSeasonName()); //春天
Season.SPRING.show(); //这是春天
//=========================================================
//这是枚举类特有的values方发,获取的是枚举类中全部枚举对象的名称集合;
SeasonEumn[] values = SeasonEumn.values();
for (SeasonEumn value : values) {
//分别打印SPRING,SUMMER,AUTUM,WINTER,这些都是枚举对象的名
System.out.println(value);
}
SeasonEumn spring = SeasonEumn.valueOf("SPRING");
System.out.println(spring);
SeasonEumn.AUTUM.toString();
SeasonEumn.AUTUM.show();
}
}
interface P {
void show();
}
//自定义枚举类jdk5.0前枚举是要自定义使用的
class Season implements P{
//1 枚举类的属性都用private final来修饰(在真正的枚举类中可以省略, 参考接口,
//接口方法默认都是public abstract的,接口变量默认都是public static fianl)
private final String seasonName;
private final String seasonDesc ;
//2 私有化类的构造器并给对象赋值
private Season(String seasonName, String seasonDesc) {
this.seasonName = seasonName;
this.seasonDesc = seasonDesc;
}
//3 以public static final的形式提供当前枚举类的多个对象(真正的枚举类中可以省略,参考接口)
public static final Season SPRING = new Season("春天","春暖花开"){
@Override
public void show() {
System.out.println("这是春天");
}
};
public static final Season SUMMER = new Season("夏天","骄阳似火"){
@Override
public void show() {
System.out.println("这是夏天");
}
};
public static final Season AUTUM = new Season("秋天","秋高气爽"){
@Override
public void show() {
System.out.println("这是秋天");
}
};
public static final Season WINTER = new Season("冬天","冰天雪地"){
@Override
public void show() {
System.out.println("这是冬天");
}
};
//4 提供一些获取枚举类属性的get方法及一些额外的方法
public String getSeasonName() {
return seasonName;
}
public String getSeasonDesc() {
return seasonDesc;
}
@Override
public String toString() {
return "Season{" +
"seasonName='" + seasonName + '\'' +
", seasonDesc='" + seasonDesc + '\'' +
'}';
}
@Override
public void show() {
System.out.println("春夏秋冬通用");
}
}
/*
经SeasonEumn.class.SuperClass测试,定义的枚举类均默认继承自java.lang.Eumn jdk5.0后推出
补充:Eumn类的toString是把对象名输出,我们可以选着重写,values方法是返回当前枚举类的对象数组
values方法,返回枚举类的对象数组,该方法方便遍历所有的枚举值;
valueOf(String str):把一个字符串型的枚举对象(如果枚举类中没有相应对象与之匹配那么就报错)转化为相应的枚举类对象
*/
enum SeasonEumn implements P{
//1 提供当前枚举类所需的枚举类,它们间用逗号隔开分号结尾;
SPRING("春天","春暖花开"){
@Override
public void show() {
System.out.println("Spring");
}
},
SUMMER("夏天","骄阳似火"){
@Override
public void show() {
System.out.println("Summer");
}
},
AUTUM("秋天","秋高气爽"){
@Override
public void show() {
System.out.println("AUTUM");
}
},
WINTER("冬天","天寒地冻"){
@Override
public void show() {
System.out.println("WINTER");
}
};
//2 枚举类的属性都用private final来修饰(真正的枚举类中可以省略,参考接口)
private final String seasonName;
private final String seasonDesc ;
//3 私有化类的构造器并给对象赋值
private SeasonEumn(String seasonName, String seasonDesc) {
this.seasonName = seasonName;
this.seasonDesc = seasonDesc;
}
//4 提供一些获取枚举类属性的get方法及一些额外的方法
public String getSeasonName() {
return seasonName;
}
public String getSeasonDesc() {
return seasonDesc;
}
}
一个案例精通枚举类
猜你喜欢
转载自blog.csdn.net/wwwwwww31311/article/details/113120848
今日推荐
周排行