如何自定义枚举类?步骤:
//自定义枚举类
class Season{
//1.声明Season对象的属性:private final修饰
private final String seasonName;
private final String seasonDesc;
//2.私化类的构造器,并给对象属性赋值
private Season(String seasonName,String seasonDesc){
this.seasonName = seasonName;
this.seasonDesc = seasonDesc;
}
//3.提供当前枚举类的多个对象:public static final的
public static final Season SPRING = new Season("春天","春暖花开");
public static final Season SUMMER = new Season("夏天","夏日炎炎");
public static final Season AUTUMN = new Season("秋天","秋高气爽");
public static final Season WINTER = new Season("冬天","冰天雪地");
//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 "Season{" +
"seasonName='" + seasonName + ''' +
", seasonDesc='" + seasonDesc + ''' +
'}';
}
}
jdk 5.0 新增使用enum定义枚举类。步骤:
//使用enum关键字枚举类
enum Season1 {
//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"),
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;
//2.私化类的构造器,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;
}
}
// System.out.println(Season1.class.getSuperclass());
System.out.println("");
//values():返回所的枚举类对象构成的数组
Season1[] values = Season1.values();
for(int i = 0;i < values.length;i++){
System.out.println(values[i]);
}
System.out.println("");
Thread.State[] values1 = Thread.State.values();
for (int i = 0; i < values1.length; i++) {
System.out.println(values1[i]);
}
//valueOf(String objName):返回枚举类中对象名是objName的对象。 Season1 winter = Season1.valueOf("WINTER"); //如果没objName的枚举类对象,则抛异常:IllegalArgumentException
// Season1 winter = Season1.valueOf("WINTER1");
System.out.println(winter);
//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");
}
};
}