Java 基础(枚举类)
1.枚举类的理解:类的对象只有有限个,确定的
2.当需要定义一组常量时,强烈建议使用枚举类
3.如果枚举类中只有一个对象,则可以作为单例模式的实现方式
package com.klvchen.java;
public class SeasonTest1 {
public static void main(String[] args){
Season1 summer = Season1.SUMMER;
System.out.println(summer);
System.out.println(summer.toString());
System.out.println(Season1.class.getSuperclass());
System.out.println("********************");
Season1[] values = Season1.values();
for (int i = 0; i < values.length; i++){
System.out.println(values[i]);
values[i].show();
}
System.out.println("********************");
Thread.State[] values1 = Thread.State.values();
for (int i = 0; i < values1.length; i++){
System.out.println(values1[i]);
}
System.out.println("********************");
Season1 winter = Season1.valueOf("WINTER");
System.out.println(winter);
winter.show();
}
}
interface Info{
void show();
}
//使用 enum 关键字枚举类
enum Season1 implements Info{
//1.提供当前枚举类的对象,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("宁夏");
}
},
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;
}
public String getSeasonName(){
return seasonName;
}
public String getSeasonDesc(){
return seasonDesc;
}
@Override
public void show(){
System.out.println("这是一个季节");
}
}