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Answered 2010-06-21 11:20:02

Constructor overloading is similar to method overloading. You can overload constructors by changing the parameter list in the class definition.

Here is an example

public class Box{

private int height;

private int width;

private int breadth;

// First constructor with no parameters

Box(){

height = 0;

width = 0;

breadth = 0;

}

// This is the second overloaded constructor

Box(int h,int w,int b){

height = h;

width = w;

breadth = h;

}

public void display(){

System.out.println("Height: "+height+" Width: "+width+" Breadth: "+breadth);

}

public static void main(String args[]){

Box obj = new Box(1,2,3);

obj.display();

}

}

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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); } }


if we write a code in java then we don't mansion a default constructor in it then compiler by default provide a default constructor and the main impotent role of default constructor in our program is that it initialize the member of the class then it is reason compiler provide a default constructor in our java program code .


No. If you do not write a constructor for you classes, the default Object constructor can still be used.


write a program for Fibonacci series by using cunstructer ti initilised the value


These are two different things. "Super" is used in inheritance - if class B inherits from class A, and we want the constructor of B to do the same things the constructor of A does (and maybe more things), we can call A's constructor in B's constructor: public B() { super(); ...... } Notice that it must be the first line in B's constructor. "This" is used in case of overloading, to call a function aith the same name. For example, if we have a constructor that receives one argument, and we it want to have a default value of 0, we can write: public C() { this(0); }


class complex { private: double real; double imaginary; public: complex() {...} // constructor, etc. operator+(const& complex a) { // operator plus this->real += a.real; this->imaginary += a.imaginary; } }


// constructor program to add two number's // program written by SuNiL kUmAr #include<iostream.h> #include<conio.h> class constructor { private: int a,b; public: constructor(int m,int n); int sum(); }; constructor::constructor(int m,int n) { a=m; b=n; } int constructor::sum() { int s; s=a+b; return (s); } int main() { int x,y; clrscr(); cout<<"enter two number's to add \n"; cin>>x>>y; class constructor k (x,y); cout<<"sum of two number's is = "<<k.sum(); getch(); return (0); }


The default constructor is an empty (only call the super constructor) with no parameters constructor inserted by the java compiler when you don't define a constructor in your class. If you write something like this: public class NoConstructorClass{ //no constructor goes here } Then you get something like this: public class NoConstructorClass{ public NoConstructorClass(){ // Default constructor that you didn't write super(); } }


When we want to create an Object for a class at that time we will write constructor.


Any time you don't write any constructor for your class, the compiler supplies the default constructor. In other words, if you wrote a constructor the compiler won't.


May be link might help -> http://www.allinterview.com/viewpost/408298.html There it is implemented through...... Operator Overloading!


This is when you overload the constructor so that there isn't just one way you can initialize the class objectAssume you have a class called Foo and you want two different constructorsFoo(int a, int b);Foo(float a, float b);using a method like this can make your classes more dynamic and you don't need to to write a new class to handle different types. Sorry for the lack of Java code, i program in C++ but it you can overload functions and constructors in C++ too.


Write a C program called MonthDays to find the number of days in a given month Test your code with different input values to demonstrate that your function is robust?


C does not support operator overloading. If you mean C++ operator overloading, it depends on exactly what you wanted to do. If you wanted to '+' to strings, then you could write: string operator+(string a, string b) { // do something }


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 constructor of a class in invoked when a object of that class is created. As an abstract class can't have an object, so we can't create a constructor of the abstract class. But we can create a constructor of a concrete subclass of that abstract class and we have to pass the object of that concrete subclass to the abstract class.


Constructors in java cannot be invoked explicitly. They are invoked automatically when an object is created. In java if u dont write any code for constructor, by default compiler inserts a zero argument constructor. If required, it can be overrided.


Explicit means done by the programmer. Implicit means done by the JVM or the tool , not the Programmer. For Example: Java will provide us default constructor implicitly.Even if the programmer didn't write code for constructor, he can call default constructor. Explicit is opposite to this , ie. programmer has to write .


Below is an example of method overloading which returns the sum of two number types. Each method performs the calculation and returns a value in a different type. int sum(final int a, final int b) { return a + b; } long sum(final long a, final long b) { return a + b; } float sum(final float a, final float b) { return a + b; } double sum(final double a, final double b) { return a + b; }


A constructor lets you write code that will be executed when the class is instantiated with the "new" keyword.


You only need a constructor if the default constructor will not suffice. Often times, it is useful to have a constructor that takes common parameters so that you do not have to write additional code. For example, a Point class might have a constructor for Point(int x, int y), which would be a shortcut for assigning x and y independently. Other classes may not need any default values assigned, and for this, it is acceptable to just use the default constructor. Finally, some classes are virtual, static, or abstract, and so may not need a constructor because the constructor is unnecessary (static), or may be defined elsewhere (virtual, abstract).


Yes you can but it is not required. A Servlet is nothing but another .java file and all rules that are applicable to standard Java classes are applicable to them. Note: Even if you write a constructor in a servlet, it will not get executed.


Nothing Happens. Actually such a constructor is called a Default Constructor. Even if we do not write a constructor for a class, Java would automatically place a default constructor inside the class. Ex: Public class Test { public String getName(){ return "Hi"; } } Public class TestEx { public static void main(String[] args){ Test obj = new Test(); System.out.println(obj.getName()); } } Here we were able to instantiate an object of class Test even though we did not define a constructor for that class. This is because Java automatically places a default constructor for the class.


The following is a program with 4 classes and a structure. Constructors and destructors are generated automatically by the compiler so you really only need them if you need more specialised construction. However, a user-defined constructor and destructor have been declared in class A. You don't give any details on what the program should actually do, so it's up to you to fill in the details. As it stands, this program does nothing useful whatsoever, but it has everything you asked for. #include<iostream> class A{ A() {} //constructor ~A() {} // destructor }; class B : public A {}; class C : protected B{}; class D : private C {}; struct E : public A {}; int main() { A a; B b; C c; D d; E e; }


write a c program for implementing queue ?



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