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Answered 2009-12-21 04:12:15

In C++, overloading, overriding, and polymorphism have the following meanings...

Overloading is when you create two functions of the same name, but with different argument types, or with a different number of arguments. The compiler generates code for each case. This can be done inside or outside a class. Operators can also be overloaded, as they are (for all practical purposes) functions, but operators can only be overloaded in the context of a class.

Overriding is when you derive a child class from a base class, and you replace a method (function) of the base class with a method of the child class using the same type and number of arguments. This is not overloading - it is redeclaration - and the overridden method only applies when dealing with an instance of the child class.

Polymorphism is the same as overriding, except that you declare any base method virtual, making all base and derived methods virtual. Virtual, in the context of a class, means to create a table in the static portion (all instances) of the class that point to the specific overridden variants of the methods of the class. This allows you to declare a pointer to the base class, initialize it with the address of an instance of either the base class or any of the child classes, invoke a method of the class, and have the proper binding determined at run-time.

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Runtime prolymorphism means overriding compiletile polymorphism means overloading

The dictionary definition of polymorphism refers to a principle in biology in which an organism or species can have many different forms or stages. This principle can also be applied to object-oriented programming and languages like the Java language. Subclasses of a class can define their own unique behaviors and yet share some of the same functionality of the parent class.Overriding and Overloading are two techiques to achive polymorphism in Java.Method overloading: When a method in a class having the same method name with different arguments is said to be method overloading. Method overriding : When a method in a class having the same method name with same arguments is said to be method overriding.

Overriding is closely connected to polymorphism. Redefining method is similar to Overriding but you cannot expect those redefined methods to deliver polymorphism.The concept of redefining is used when it involves static methods.

overriding means you're changing an already existing method. overloading means you're using the same method name, but you use different parameters in each one.

The main difference is that: neither of them are related to one another. They have nothing similar between them and are totally different. The only point here is that they are both used in Java which can be stated as a similarity. Inheritance is the feature wherein functionality from one class is available for another class. Polymorphism refers to the feature wherein the same entity exists as multiple items. Ex: method overriding, method overloading etc.

Overloading usually signifies having multiple methods inside the same class with different signatures (different return type, arguments) Overriding usually signifies having a method in the child class with exactly the same name and signature as in the parent class.

Static polymorphism:memory allocated at compile time is called as static resolves calls to overloading methods at compile time is called as Static polymorphism.Dynamic polymorphism:memory allocated at run time is called as dynamic allocationjava resolves calls to overloading methods at run time is called as Dynamic polymorphism or Dynamic binding or Dynamic dispatch.This principle is used to create reference variable.

really there is no difference between constructor overloading and metho overloading

Overloading the same method name with different number of arguments (and the data types), and perhaps with a different returned data type. The method signatures are different, only the names are the same. Overriding is to change the same method name with different implementation (the method body). The method signature stays the same.

Operator overloading simply means to provide a new implementation for an existing operator. Polymorphism is a function of inheritance whereby it is not necessary to know the runtime type of an object so long as you know the generic type. The virtual table ensures you gain specific behaviour by calling the generic type's virtual methods.

Here are some of the most common differences between both of them. If you are working in Java for more than 1 year, you might be familiar with all of them but any way its good revision: 1) First and major difference between Overloading and Overriding is that former occur during compile time while later occur during runtime. 2) Second difference between Overloading and Overriding is that, you can overload method in same class but you can only override method in sub class. 3) Third difference is that you can overload static method in Java but you can not override static method in Java. In fact when you declare same method in Sub Class it's known as method hiding because it hide super class method instead of overriding it. 4) Overloaded methods are bonded using static binding and Type of reference variable is used, while Overridden method are bonded using dynamic bonding based upon actual Object. 5) Rules of Overloading and Overriding is different in Java. In order to overload a method you need to change its method signature but that is not required for overriding any method in Java.

Method overriding is when a child class redefines the same method as a parent class, with the same parameters. For example, the standard Java class java.util.LinkedHashSet extends java.util.HashSet. The method add() is overridden in LinkedHashSet. If you have a variable that is of type HashSet, and you call its add() method, it will call the appropriate implementation of add(), based on whether it is a HashSet or a LinkedHashSet. This is called polymorphism. Method overloading is defining several methods in the same class, that accept different numbers and types of parameters. In this case, the actual method called is decided at compile-time, based on the number and types of arguments. For instance, the method System.out.println() is overloaded, so that you can pass ints as well as Strings, and it will call a different version of the method. Overriding is an example of run time polymorphism. The JVM does not know which version of method would be called until the type of reference will be passed to the reference variable. It is also called Dynamic Method Dispatch. Overloading is an example of compile time polymorphism.

Overloading a method means to provide the same method name with different signatures, to cater for all the different parameter types that may be passed to a method. Overriding means to provide a new implementation of an existing method, inherited from a base class. Overloaded methods can also be overridden.

In static polymorphism is exhibited at compilation time, where as dynamic exhibited at runtime...

overloading” is having the functions (methods) with the same name but different signatures. Overloading acts on different data types in different ways.“overriding” is having a methods with same name and same signature in a parent class and the child class. Overriding acts on different object types in different ways. ......

Overriding means to provide a new implementation for an existing method. The existing method must be inherited from a base class. Overloading means to provide the same method name, but with a different signature, to cater for the different parameter types the method can accept. Overloaded methods inherited from a base class can also be overridden in a derived class.

Ploymorphism: It is the Object Oriented concept in which a single Object or function or variable is used in different forms. Overloading: polymorphism in which the same function name is used for different implementations with different parameter list or different types of parameters. Eg: To find the sum of integers, floats, double int sum(int, int); float sum(float, float); double sum(float, float); Note: if the retrun type is different the function is not overloaded but its a compilation error. Overriding: if a base class function is given a definitation in the derived class then this is called function overriding. Eg: class Base { int print() { System.out.println("Hello"); } } class Derived extends Base { int print() // overrides the function print in base class { System.out.println("Hi"); } } Note: in function overriding the drived class function's return type and the parameters should be the same as the base class function.

Static polymorphism is used the concept of early binding or we can say compile time binding where as dynamic polymorphism used the concept of late binding or run time binding.

Short answer: They are the same. Long Answer, (and yet less revealing): Polymorphism is simply the ability to have many different methods (Or functions, for those who are used to C-Type programs) to have the same name, but act differently depending on the type of parameters that were passed to the function. So for example, we may have a method called punch, which accepts no parameters at all, and returns an integer: public int punch() { return 3; } We could also have a method named punch that accepts a String and returns a boolean. public boolean punch(String poorGuyGettingPunched) { if(poorGuyGettingPunched.equals("joe")) { System.out.println("sorry Joe"); return true; } else return false; } That is called polymorphism... And strangely enough, it is also called overloading. Do not confuse this with overriding, which replaces a function or method with a new one, or rather, hides the old method and replaces it with a new one.

Overloading is when you have multiple methods of the same name,same parameter list,same return type in a single class.Among method name, parameter list ,return type any thing must be different.Overriding is when you have methods in a child class that has the same name,same parameter list,same return type as in the parent class.

Overloading is when you're asking something, usually some sort of machinery, to do more than it's designed to. Say you have an elevator that's rated for 5 people, but you cram more persons into it - then the elevator is overloaded. Overriding is when an operator decides to ignore or bypass a warning. Say that the warning light for low oil pressure/level lights up in a car, but the driver decides to keep going - then the driver is overriding the warning signal.

wrapping up of data and function into a single unit is called encapsulation where polymorphism is the ability to take more than one form

Overloading and overriding do similar things but they are distinct. When you override a function, you are providing a new implementation of a function that was inherited from a base class. The signature of an override must be covariant with the base class signature. Overloading means to create several functions with the same name within the same namespace but with different signatures.

Inheritance is the object oriented feature by which the functionality and features of one class are made available to another class without having to copy paste the code. Polymorphism is the object oriented feature by which multiple methods of a class can coexist with minor differences. Ex: method overloading.

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