枚举类
一个类中的对象 认为个数是有限且固定的 可以将每一个对象一一列举出来；
JDK1.5版本之后可以直接定义enum类型；
我们自己定义的enum类直接默认继承Enum(java.lang包）
我们自己定义的enum类型不能再写extends 但是可以实现；
package eenum;
/*
public enum Day{
//描述了七个当前类的对象
monday("星期一",1),tuesday("星期二",1),wednesday,thursday,friday,saturday,sunday
private String name;
private int index
private Day(){
}
private Day(String name,int index){
this.name=name;
this.index=index;
}
public String getName(){
return this.name;
}
public void setName(String name){
this.name=name;
}
}
*/
public enum Day{
//描述了七个当前类的对象
monday,tuesday,wednesday,thursday,friday,saturday,sunday
}
/*
public enum Day{
//描述了七个当前类的对象
monday,tuesday,wednesday,thursday,friday,saturday,sunday
}
*/
/*
public class Day{//7个对象
private Day(){
}//构造方法私有
//所有对象都是属性
public static final Day monday=new Day();
public static final Day tuesday=new Day();
public static final Day wednesday=new Day();
public static final Day thursday=new Day();
public static final Day friday=new Day();
public static final Day saturday=new Day();
public static final Day sunday=new Day();
}
*/
package eenum;
import java.util.Scanner;
public class Test{
public static void main(String[] args){
Scanner input=new Scanner(System.in);
System.out.println("请输入一个星期的英文单词");
String dd=input.nextLine();
Day day=Day.valueOf(dd);
switch(day){
case monday:
System.out.println("星期一");
break;
case tuesday:
System.out.println("星期二");
break;
case wednesday:
System.out.println("星期三");
break;
case thursday:
System.out.println("星期四");
break;
case friday:
System.out.println("星期五");
break;
case saturday:
System.out.println("星期六");
break;
case sunday:
System.out.println("星期日");
break;
default:
System.out.println("错误");
}
}
}
/*
public class Test{
public static void main(String[] args){
Day a=Day.monday;
Day[] ds=Day.values();
for(Day d:ds){
System.out.println(d.name()+"--"+d.ordinal());
}
System.out.println();
Day d=Day.valueOf("monday");
System.out.println(d.name()+"=="+d.ordinal());
}
}
*/
/*
public class Test{
public static void main(String[] args){
Day day=Day.monday;
}
}
*/
