Table of Contents 1. Keyword: this 1.1What is this? 1.2 When to use this 1.2.1 Using members of the current object in instance methods or constructors 2. Object-oriented feature two: inheritance (inheritance) 2.1 Overview of inheritance 2.1.1 Inheritance in life 2.1.2 Inheritance in Java: 2.1.3 Benefits of inheritance 2.2 Inherited syntax 3. Rewriting of methods […]
Tag: overriding
Method overriding, Final, polymorphism
1. Method overriding 1.1. The concept of method overriding Override: method override, subclass overrides the method of the parent class, extends the method of the parent class 1 The method name is the same, the parameter list is the same, and the return value is the same 2 It cannot have lower access permissions than […]
Mybatis real batch insertion-overriding method InsertBatchSomeColumn
1. Add custom method SQL injector //Add method for batch insertion public class CustomSqlInjector extends DefaultSqlInjector { @Override public List<AbstractMethod> getMethodList(Class<?> mapperClass) { // Get the parent class SQL injection method list List<AbstractMethod> methodList = super.getMethodList(mapperClass); //Add the batch insertion method. This method will be rewritten below. methodList.add(new CustomSqlInjector ()); return methodList; } } 2. […]
Inheritance, Object class, method overriding, subclass constructor, similar constructor
1. What is inheritance? What are the characteristics of inheritance? ·Inheritance is to use the extends keyword to establish a parent-child relationship between one class and another class. Subclasses can inherit non-private members of the parent class. 2. For a class with inheritance relationship, how does Java create its object? After the object is created, […]
Method Overriding and Polymorphism
Method overriding and polymorphism Article directory Method Overriding and Polymorphism What is method overriding Rules for Method Overriding Method Overriding vs Method Overloading Object class – **Object class is the parent class of all classes** -Methods of the Object class that are often overridden by subclasses -equals() method of Object class Override equals() polymorphism Why […]
C++ functions with the same name – overloading, hiding, overriding
An article takes you to understand C++’s overloading, overriding and rewriting! C ++ Inheritance (4) — Hiding with the same name (redefinition) c ++ function with the same name—-overloading, hiding, covering Overloading, Overriding, and Redefinition in C++ (hidden by the same name) (***demo code included) Difference between function overloading and function overriding (**) Briefly describe […]
Resource overriding between Android apps
This solution is based on android 9.x authentication Description of the problem The customer wants our main application MainApp, but wants to change the resource application ResApp through the value to meet the needs of changing the multilingual translation of the application That is, we provide customers with the apk file of MainApp and the […]
Overriding, overloading, equals, == must be mastered
Life is morning rises and evening falls, the days are firewood, rice, oil and salt, time flies, and we will finally let go. The difference between rewriting and overloading Override 1. Occurs between the parent class and the child class 2. The method name, parameter list, and return type must be the same 3. The […]
method overriding (overriding), polymorphism
Method coverage means that the subclass has a method that has the same name, return type, and parameters as a method of the parent class. Then we say that the method of the subclass overrides the method of the parent class. package com.hspedu.override_; public class Dog extends Animal{ //1. Because Dog is a subclass of […]
C++ base class method overloading, overriding, hiding
C++ base class method overloading, overriding, hiding Article directory C++ base class method overloading, overriding, hiding member function overloading rewrite hide Rewriting and hiding of virtual functions Member function overloading The conditions for overloading are: functions in the same scope have the same function name and different parameter lists to constitute overloading. class Base { […]