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Difference between method overloading and constructor overloading?


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2010-09-13 17:26:44
2010-09-13 17:26:44

There is no difference between them.


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really there is no difference between constructor overloading and metho overloading

yes,because in constructor overloading constructor have same and different parameter list. In method overloading method have same name and different parameter list.

Overloading constructor means when you have multiple constructors in a class but with different number of arguments. We cannot override a constructor, but we can override a method having same arguments and same return type. This means when I subclass a particular class then I can call the superclass's class method and override that with subclass's own logic.

A constructor is just a special form of a method. You can overload constructors in the exact same way as you can overload any other method.

The first thing to note about constructor overloading is that Java creates a no argument constructor for you if and only if you have not typed a constructor yourself. Every class has a constructor even abstract ones (default no argument constructor). Abstract constructors are always executed. To overload a constructor you can do the following: class Test { String name; Test(String n) { name = n; System.out.println("Constructing Test Object named: " + name); } } In the case above we are overloading the default no argument constructor with a constructor that takes a String parameter. You can write you own no argument constructor as follows: class Test { Test() { System.out.println("Constructing Test Object"); } } To override our own no argument constructor we do this: class Test { Test() { // our no argument constructor System.out.println("Constructing Test Object"); } String name; Test(String n) { // overloading our no argument constructor with this // constructor that take a String parameter name = n; System.out.println("Constructing Test Object named: " + name); } }

A constructor is a special method that has the same name as the class name, and it cannot be invoked or called like a method call, it must be invoked by the new operator. For example, new Object();

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.

Yes. Method Overloading is a form of Polymorphism

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.

The constructor is a method that runs to initialize the instance of the class. It runs right after memory allocation. The destructor is a method that runs to deinitialize the instance of the class. If runs right before memory deallocation.

method overloading means function having same name but different prototype .. e.g class demo { int i; public void display() { System.out.println("hello"); } public void display(int x) //method overloading { i=x; System.out.println("i="+i); } } class mainDemo { public static void main(String s[]) { demo ob=new demo();//creating object ob.display(); ob.display(5); } }

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.

Assuming you mean Java: A constructor is very similar to a "normal" method, in that it is a place to type commands. The main differences is that a constructor is invoked automatically every time an object of the specified class is instantiated. With respect to syntax, there are two differences: (1) The constructor must have the same name as the class (including upper- and lowercase), and (2) The constructor has no declared return value, not even void.

Both are functions, i.e., places where you can write code. A constructor is simply a special method that is invoked automatically when an object is created.

A class is simply the definition of a data type. A constructor is a special method of a class that is automatically invoked whenever an object of that type is instantiated, and is used to initialise the object's data members.

A constructor is called during the creation of an instance of that class and it does not have a return type as a member function. It is not a property of the created object and the constructor can not be accessed by the object. It is like a static method that only gets called during object creation.

JavaThere is really no such thing as a static constructor in Java. The closest thing that comes to mind is a factory class, which calls a private constructor when a static method is called.class A {// This private constructor can't be called by any other class.private A() {}// Here is your "static" constructorpublic static A getInstance() {return new A();}}

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.

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.

Constructor will be automatically invoked when an object is created whereas method has to be called explicitly. Constructor needs to have the same name as that of the class whereas functions need not be the same. * There is no return type given in a constructor signature (header). The value is this object itself so there is no need to indicate a return value. * There is no return statement in the body of the constructor. * The first line of a constructor must either be a call on another constructor in the same class (using this), or a call on the superclass constructor (using super). If the first line is neither of these, the compiler automatically inserts a call to the parameterless super class constructor.

A constructor is a method that fires when the object is instantiated. A friend function is a function that has special access to the object. They are two different types of things, and cannot be further differenced.

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.

The main method is the method called when the Java application is started The constructor is called whenever a new object is instantiated.

A constructor is a special method that gets executed when the object is created.

Default Constructor will be called first . If you override Validate method , then validate method will be called .

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