Definition of Constructor:
A constructor is a special member
function whose have the same name as the class name, but the function
(constructor) never returns any value. A constructor initializes an objects
immediately upon creation. Once defined, the constructor is automatically
called immediately after the object is created.
Parameterized Constructor:
Passing
arguments to the function is called parameterized function. Similarly passing
arguments to the constructor is called parameterized constructor.
Method overriding:
When a
method in a subclass has the same name and type signature as a method in its
super class , then the method in the subclass is said to be override the method
in the super class.
Describe all above feature with the following example:
class A
{
int x,y;
A()
{ // zero argument constructor
}
A(int i,int
j) // parameterized constructor
{
x=i;y=j;
}
void show()
// override methods by subclass version
{
System.out.println("x="+x+"
y="+y);
}
}
class B extends A
{
int z;
B(int i,
int j, int k) // parameterized constructor
{
super(i,j);
z=k;
}
void show()
{
System.out.println("z="+z);
}
}
class override
{
public
static void main(String args[])
{
B
subob=new B(1,2,3); // call constructor by creating objects
subob.show();
// this calls subclass version
}
}
