创建带值枚举

自定义枚举1：

 1 package com.echo.springboot.constants;
 2 
 3 public enum AppConstants {
 4 
 5     COUNT_EVERYPAGE(8),
 6     CODE_SUCCESS(1),
 7     CODE_FAIL(0);
 8 
 9     private final int value;
10 
11     private AppConstants(int value){
12         this.value=value;
13     }
14     public int getValue(){
15         return value;
16     }
17 }

注意构造函数是必须的并且是私有的，还有其中的value是必须的。上面是自定义的。

自定义枚举2：

package com;
 
public enum Color {
     
     RED("红色", 1), GREEN("绿色", 2), BLANK("白色", 3), YELLO("黄色", 4);
     
     
    private String name ;
    private int index ;
     
    private Color( String name , int index ){
        this.name = name ;
        this.index = index ;
    }
     
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getIndex() {
        return index;
    }
    public void setIndex(int index) {
        this.index = index;
    }
     
 
}

package com;
 
public class B {
 
    public static void main(String[] args) {
 
        //输出某一枚举的值
        System.out.println( Color.RED.getName() );
        System.out.println( Color.RED.getIndex() );
 
        //遍历所有的枚举
        for( Color color : Color.values()){
            System.out.println( color + "  name: " + color.getName() + "  index: " + color.getIndex() );
        }
    }
 
}