Programmer Think

1, Inherited memory parsing   2, Polymorphism 1. Scene analysis   At this time, students want to migrate data from java to mysql operating system with good polymorphism 2. What is polymorphism A variety of manifestations of a thing. The F1 of the keyboard will get different results by pressing F1 under different software 3. Introduce po ...

Prior to es6, the implementation of JS usage methods or components required the use of functions, prototypes, and prototype chains. The concept of JS classes was introduced in es6, and we can use and build classes based on object-oriented methods using JS. Writing of ES6 classes is also allowed in TS and eventually compiled as JS code allow ...

I'm so tired to write this blog. In addition, it took me 6 hours to write and read the source code. It can be said that I was extremely lucky and bitter. Too tired, too tired!!! Linked list is a linear list with linked storage. The memory addresses of all elements are not necessarily continuous. Dynamic array has an obvious disadvantage ------ ...

abstract class Significance of abstract classes: Abstract them to improve development efficiency Abstract: Constraints You can't use the abstract class new, you can only rely on subclasses to implement it: constraints!Ordinary methods can be written in abstract classesAbstract methods must be in abstract classes package com.Demo05; //A ...

object-oriented inherit Usage scenario: if multiple similar classes have the same attributes and methods, you can extract the same attributes and methods from the parent class Benefits: reduced code redundancy Deep inheritance: When creating a subclass object, will the parent class constructor be called? meeting If you create a s ...

Abstract classes and abstract methods If a class is not associated with specific things, but only expresses an abstract concept and is only a base class of its derived classes, such a class is an abstract class. When declaring a method in an abstract class, if abstract is added, it is an abstract method Overview and declaration of abstract ...

abstract class Overview of abstract classes The class used to describe abstract concepts is called abstract class. The methods in abstract class do not have to realize specific functions. characteristic 1. Modified by abstract keyword 2. Abstract classes do not necessarily have abstract methods, but classes with abstract methods must be def ...