java 静态变量太多的优化方法

// 需要用时就Constant.A.A1   Constant.B.B2
public class Constant {
    public class A{       
        public static final String A1= "A1";
        public static final String A2= "A2";
    }
 
    public class B{       
        public static final String B1= "B1";
        public static final String B2= "B2";
    }
}

参考链接:http://bbs.csdn.net/topics/390480012