枚举类

Posted 2020-11-15 voryla

 1 public class AboutEnum {
 2     public static void main(String[] args) {
 3         People p=People.MAN;
 4         p.talk();
 5     }
 6 }
 7 enum People{
 8     // 疑问？ 为什么构造函数只能出现在枚举对象后？？？
 9     // 当创建构造函数后，需要为创建枚举类时传入参数
10     MAN(People.MAN_NAME),WOMEN(People.WOMAN_NAME);
11     // 枚举类只能创建private及一下的访问控制权限的构造函数
12     private People(String name) {
13         if(name==MAN_NAME) {
14             this.age=20;
15             this.name=MAN_NAME;
16         }else {
17             this.age=22;
18             this.name=WOMAN_NAME;
19         }
20     }
21     
22     private final static String MAN_NAME="zwk";
23     private final static String WOMAN_NAME="mmr";
24     private Integer age;
25     private String name;
26     
27     public void talk() {
28         System.out.println("hello i‘m "+this.name+" i‘m "+this.age+" years old!");
29     }
30 }