transformers override

I. The role of IsEqual The role of isequal: To determine whether two objects are equal For the base type, the = = operator compares the value;For object types, the = = operator compares the address of an object (that is, whether it is the same object) Objective-c and Java do not support operator overloading, and C + + supports operator overloading, so that you can make a judgment on operator overloading Two, rewrite the IsEqual method The type defined in the COCOA framework,NSString isequaltost

Overload, override and overwrite English close, more easily confused, coupled with a variety of translations, the use of pigtailed, often is today clear tomorrow confused. These three concepts have been discussed separately in the previous chapters, where the comparison is concentrated to make a memo:overload(heavy Duty)The preceding analysis of C + + function overloading is the use of the C + + name mangling mechanism, which allows multiple functions

First take a look at the following sample code: Parent.java public class Parent...{ 　　public void parentMethod() ...{ 　　} } Ichild.java public interface IChild ...{ 　　void interfaceMethod(); } Child.java public class Child extends Parent implements IChild ...{ 　　@Override 　　public void parentMethod() ...{ 　　} 　　@Override 　　public void interfaceMethod() ...{ 　　} } Because the code is simple, I don't e

Overload (Heavy): in a C + + program, several functions that are semantically and functionally similar can be represented by the same name, but the parameters or return values are different (including the type, the order differs), which is the function overload.(1) The same range (in the same class);(2) The function has the same name;(3) different parameters;(4) The virtual keyword is optional.Override (Overwrite): Refers to a derived class function that overrides a base class function , charact

Differences between new, override, and virtual keywords in C # The oo idea has been widely used in software development projects. The most important feature is inheritance. Recently, I briefly reviewed the inheritance feature in C, the keywords that need to be used, including some key points, are specially sorted out for your convenience. I. in C #, the keyword "new" is frequently used and has three main functions: A)It is used as an operator to

Description: The override reserved word indicates that the current function overrides the virtual function of the base class.Objective: 1. In the case of more functions, you can prompt the reader that a function overrides the base class virtual function (which means that the virtual function is inherited from the base class, not the derived class itself); 2. Forces the compiler to check whether a function overrides the base class virtual function, and

Overload, override, overwrite, rewrite these words often appear in C + + book, read some translated version found not to override, overwrite, rewrite strict distinction, mostly translated into rewrite. In fact, the English version of the original will find that different contexts are described in different words. The following is an analysis:? Overload overloadingFor this translation, there is no objection,

Whether in NetBeans or in the Eclipse development environment, when writing Java code often encounter @override tags, usually only know that the meaning of coverage is good ~ then the value of this tag is only these?Most recently, when I re-turned the thinking in Java, I looked at it, and the small label deepened my understanding of object-oriented.General Purpose Help yourself to check if the correct replication of the existing methods in t

classes.· Because the abstract method declaration does not provide real implementation, there is no method body. The method declaration ends with a semicolon and there is no braces ({}) after the signature ({}). Example: public abstract void mymethod ();· The implementation is provided by the overriding method, which is a non-abstract class member.· It is incorrect to use the static or virtual modifier in the abstract method declaration. Except for the differences in the declaration and call

ObjectiveThis article mainly to explain in C #, I feel that the master is not good or not much, not too familiar with the keywords, mainly including base, this, new, override, abstract, Virtual and execution issues between the static field and the static constructor.Base keywordbase keyword is used to access members of the base class from within a derived class:">The base keyword is used to implement access to a base class public or protected member i

First, prefaceThere are now two classes of son and parent, and type son will override the GetName function of type parent. Unfortunately, due to the code of the agricultural idea, write the following code: Public class parent{ public String getName () { return'Parent " ; }} Public class Son extends parent{ public String getnames () { return' Son"; }}The above code compiles through and does not realize the realization error, tragedy h

Idea compiler reported @override error It is said that this is the problem of JDK, @Override is JDK5, but there is a small bug, that is, do not support the implementation of the interface, that this is not override and JDK6 fixed the bug, You can add @override to either the parent class's method overrides or the inter

Override refers to "overwrite", which means that subclasses override the parent class. The method in the parent class can no longer be accessed by the object of the subclass. New is "hidden", which means that subclasses hide the method of the parent class, and of course, through certain transformations, you can access the method of the parent class in the object of the subclass. So the difference between C

Internal Declared Class, Class Member, interface or interface member has internal visibility. The internal modifier makes the class, interface, or member visible only in the current package. Code outside the current package cannot access the internal Member. Internal types or members are accessible only in files of the same assembly. Within the global range, the internal modifier is the same as the public modifier. Internal modifiers cannot be combined with any other visibility mo

C + + language standards These years have evolved quickly, and many of the newly introduced features have not been used. To be honest, I am also lazy, always feel that I have mastered the C + + has enough to deal with the daily projects, so there is no motivation to learn new features. And always feel that the new introduction of the characteristics of most belong to the kind of "grammatical sugar", can play a small role, in fact, is dispensable. But recently when I wrote a small program, there

Write the program today, when importing a Web service project, always give me an error. When the line was wrong, first check the JDK version, the original project version is 1.5, and the inside of the class write a bit of a problem. The main problem is @override. A method declared in a base class, implemented in an inheriting class, can be annotated with @override. However, if method is in a interface inst

Document directory Reference: C # Essence Execution result Result Analysis: Note: Polymorphism and abstract keywords Interface and Polymorphism Reference: C # Essence Example: using System;using System.Collections.Generic;using System.Linq;using System.Text; public class BaseClass { public virtual void displayName() { Console.WriteLine("BaseClass"); } } public class DerivedClass : BaseClass { public virtual void displayName()

C # selecd, new, virtual, abstract and override, Most of the content in this article is taken from. NET development expert Liang jian. NET:. NET in-depth experience and practical needs. The blogger is only a porter. Abstract classes are not very clear about virtual methods and cannot be used in their current work. I downloaded a book a few days ago and found that it was very vivid and made me suddenly enlightened. Sort it out and try again to help mor

The notion that there is a set of fundamentals in the C + + language is always confusing: What does overload, override, and overwrite mean? Here are three concepts to organize:1. Overload (Heavy Duty)The notion of overloading is best understood, in the same class declaration scope, where multiple functions with identical names and different parameters (types or numbers) are defined, called Overload (Overloads). The characteristics of overloading are a

The public boolean equals (Object obj) in object objects, and the method returns true for any non-null reference value x and Y, when and only if X and Y refer to the same object;Note: When this method is overridden, it is often necessary to override the Hashcode method to maintain the general contract of the Hashcode method, which declares that the equality object must have an equal hash code. As follows:(1) when Obj1.equals (OBJ2) is true, obj1.hashc