class

问题 Friends, I have an issue in Java: I'd like to implement one structure but I'm facing some difficulty in doing it, can anyone help me. interface samp1{ method1() method2() method3() } interface samp2{ method4() method5() } class Samp implements samp1,samp2 { // this class needs only method1 from interface samp1 and method 4 from interface samp2 // I don't want to override all the methods from interface } can anyone propose some solutions for this? Is there any design pattern available for this

问题 EDIT: I see I'm getting a lot of downvotes on this post. I've tried to explain what I try to do, where my errors and in which direction want to go. I'm asking for insight in what I'm doing wrong. If you downvote; pleas tell me why, so I can improve the question. Thanks. I'm creating an application where I have one main form, and several different User Controls which the user works on. This helps me splitting the code, managing the different parts of the program. And it would be easy to expand

问题 I am writing a c++ code and my need is to declare a class having two elments as class arr{ public: long num; string str; }; now i need to store almost 1000000 elments of this class(depending on user input number of class object can warry in a range of 1 <= n <= 1000000 The object are created dynamically as #include <iostream> #include<string> using namespace std; class arr{ public: long i; string str; }; int main(){ long n,j,i; cin>>n; arr a[n]; .... rest of programme but if value of n is

问题 I have an SQLite database that is in a separate class from the main class that extends Activity. I noticed that there are two ways of setting up the database. one way is to put it inside the main Activity class, either in the class or as a nested sub class. the second way is to put it in the separate class. the separate class looks better, however there is one disadvantage. You have to create an instance of it in the main activity class every time you want to do something. I read that

问题 This all originates from querying Google Analytics data. For a basic query the main factors that change are the dimensions and the metrics . The object that is returned is of a type called GaData, and the actual results that you need reside in GaData.Rows. The format of GaData.Rows looks like this: There will first be a row for each dimension, in this example there is a row for "New Visitor" and a 2nd row for "Returning Visitor". Within those rows will be another set of rows that contain the

问题 I have create three classes. One class is db which extends from PDO. Other two class extends from the db class. But the problem is when I initialize objects of these sub classes the second object is created as clone of the first object. Thanks in advance for any help. <?php /** The Database Driver */ define('DB_DRIVER', 'mysql'); /** The name of the database */ define('DB_NAME', 'sample'); /** MySQL database username */ define('DB_USER', 'root'); /** MySQL database password */ define('DB

问题 What is real difference between Class and Structure when you are dealing with Object Oriented Programming. This question is asked many times during my interviews for SE. Some people says that there is only one difference: Structure members are public by default and Class members are private by default. Some says there are many differences. After reading many articles and forums, I have the following differences: Classes DEFAULT to having private members. Structures DEFAULT to having public

问题 So lets say I have a class called Car as below: class Car(object): """Car example with weight and speed.""" def __init__(self): self.weight = None self.speed = None If I initialize a Car as an empty object: red_car = Car() And I add a speed and a weight : red_car.speed = 60 red_car.weight = 3500 That's all fine but what if I want to run a function when attempting to add those variables to the instance? Like this function: def change_weight(self, any_int): return (any_int - 10) The thing is

问题 Is it possible to call parent method in JavaScript class but to still have access to prototype methods from parent and child class. Here is code example: var Base = function() { this.baseMethod = function(){ return 'baseMethod'; }; this.baseInitMethod = function() { return 'baseInitMethod'; } } Base.prototype.basePrototypeMethod = function() { return "basePrototypeMethod"; }; var Specific = function() { Base.call(this); this.baseInitMethod = function() { // call baseInitMethod from Base class

问题 So lets say I have a class called Car as below: class Car(object): """Car example with weight and speed.""" def __init__(self): self.weight = None self.speed = None If I initialize a Car as an empty object: red_car = Car() And I add a speed and a weight : red_car.speed = 60 red_car.weight = 3500 That's all fine but what if I want to run a function when attempting to add those variables to the instance? Like this function: def change_weight(self, any_int): return (any_int - 10) The thing is