小编Ash*_*ngh的帖子

class A {
    void test() {
    }
}

class B extends A {
    void test() {
    }

 public static void main(String[] args)
{
 B b=new B();
//insert code here
}
}

如何test为B 类的对象b调用A类的方法？特别是对象b

我正在阅读GAE数据存储区中的行,我想按字母顺序对它们进行排序.

假设我有这样的事情:

key      name      description    sequence  
===========================================  
ASD..    maths1    it is maths    chap21.1  
ASD..    maths2    it is maths    chap21.10  
ASD..    maths3    it is maths    chap21.2  

我希望结果按字母顺序排序在序列字段上,如下所示:

key      name      description    sequence  
===========================================  
ASD..    maths1    it is maths    chap21.1  
ASD..    maths3    it is maths    chap21.2 
ASD..    maths2    it is maths    chap21.10