Programmer Group

It is said that the roommate static member variable does not know its role, and it is also said that the roommate const is not very good. I wrote this study note with my backhand. The data members in a class not only have int s and char s, but also describe many complex situations. The data members in a class may need to be shared among multipl ...

Before I started, I had been trying to find a popular and intuitive example to introduce object-oriented. Look around and find that everything can be object-oriented and nothing is object-oriented. Later, I found that the way human beings understand society is more object-oriented. "Birds of a feather flock together and people flock togeth ...

An interface is a further step of an abstract class. An abstract class can also contain non abstract methods and fields. While the methods contained in an interface are abstract methods, and fields can only contain static constants Sometimes you must derive a subclass from several classes and inherit all their properties and meth ...

This blog is derived from C + + language learning. Constructors are widely used. Constructors generally need 1. The constructor name is the same as the class name; 2. There is no return value type declaration before the constructor name. 3. Constructor cannot return a value through return. 4. Typically, constructors have a public attribute. The ...

When you need to get a certain type of object in large quantities, you can use factory mode Factory mode Steps: Create a functionReturns an object in the function return {} //Create factory function //1. Create function and object attributes function createPerson(name,age,address,className){ //2. Return th ...

Tip: the following is the main content of this article. The following cases can be used for reference 1, Date class (time date class) 1. General Date represents a specific time, accurate to milliseconds 2. Construction method Method nameexplainpublic Date()Allocate a Date object and initialize it so that it represents the time it is ...

preface This article introduces the three characteristics of object-oriented. Tip: the following is the main content of this article. The following cases can be used for reference 1, Encapsulation 1. Concept It is one of the three characteristics of object-oriented (encapsulation, inheritance and polymorphism). It is the simulation ...

UML Sequence Diagram Sequence diagrams are the most commonly used UML diagrams after class diagrams. Sequence diagrams represent interactions as a two-dimensional graph with the time axis vertically and the time going down vertically. The horizontal axis represents the roles in collaboration and is generally a Class.Objects, with a dashed line ...

object 1. An object is a concrete existence created by a class and can be used directly 2. The object created by which class has the properties and methods defined in which class 3. The object is relative to the aircraft manufactured by the application drawing, and the drawing is a class 4. In development, there should be classes first and the ...

I can't do too many things in my life, so everything should be wonderful-------- Steve Jobs abnormal (1) Abnormal conditions in the program. (2) Abnormal system Throwable |– Error is a serious problem and we won't deal with it. |–Exception |– RuntimeException is a runtime exception. We need to correct the code |– non ...