Definition
A constructor in a class is a special type of subroutine called to create an object. It prepares the new object for use, often accepting arguments that the constructor uses to set required member variables.
A constructor resembles an instance method, but it differs from a method in that it has no explicit return type. Constructors often have the same name as the declaring class.Syntax
NameOfClass() {
//Statements
}
NameOfClass(Parameters) {
//Statements
}
ParentClass{
//Statements
}Constructor Overloading Example Program
class ConstructorOverloading{
ConstructorOverloading(){
System.out.println("1. " + "Constructor with no parameter.");
}
ConstructorOverloading(int p, int q){
System.out.println("2. " + (p+q));
}
ConstructorOverloading(int p, int q, int r){
System.out.println("3. " + (p+q+r));
}
ConstructorOverloading(int p, int q, float r){
System.out.println("4. " + (p+q+r));
}
ConstructorOverloading(float r, int p, int q){
System.out.println("5. " + (p+q+r));
}
public static void main(String []args){
ConstructorOverloading obj = new ConstructorOverloading(10, 20);
ConstructorOverloading obj1 = new ConstructorOverloading(10, 20, 30);
ConstructorOverloading obj2 = new ConstructorOverloading();
ConstructorOverloading obj3 = new ConstructorOverloading(10, 20, 4.5f);
ConstructorOverloading obj4 = new ConstructorOverloading(7.8f, 10, 20);
}
}
Sample Output
Output is:
2. 30
3. 60
1. Constructor with no parameter.
4. 34.5
5. 37.8
