In this article,Deriving a class and Polymorphism in java are explained in detail with examples.
This concept is related to inheritance.Hence we inherit properties and methods of existing class into a new class.
Here, inheritance is done as follows (Using extends keyword).
Ex
Polymorphism in Java.
Polymorphism is done through methods in java.They are implemented in two ways.
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This concept is related to inheritance.Hence we inherit properties and methods of existing class into a new class.
Ex
class A
{
-----
-----}
class B extends A
{
-----
-----
}
class A members can be used directly in class B hence, the advantage is "re-usability".
Base class
|
|
|
Derived class
Note
Using the object of derived class we can access base class members, this is re-usability.
//program related to Deriving a class and Polymorphism in java--derived class
class ParentClass
{
int pi;
ParentClass()
{
pi=100;
}
void ParentMethod()
{
System.out.println("Parent class Method");
}
}
class ChildClass extends ParentClass
{
int ci;
ChildClass()
{
ci=200;
}
void ChildMethod()
{
System.out.println("Child class Method");
}
}
class DerivingClass
{
public static void main(String args[])
{
ChildClass ch=new ChildClass();
System.out.println("childclass ci: "+ch.ci);
System.out.println("Parent class pi: "+ch.pi);
ch.ChildMethod();
ch.ParentMethod();
}
}
Output
The existence or Behaviour of a single product in many ways depending on some condition is known as polymorphism.
Poly means many, Morphism means forms.
Ex
Here water can be used in many forms (Liquid,Solid,Gaseous) according to the temperature condition.
Static polymorphism
It is known as compilation time polymorphism because, during compilation of java program, JVM knows which method should be executed at a particular line in a program.
Constructor overloading
Two or More constructors in a single class with same name and atleast one difference in "signature" is known as constructor overloading. (From topic Deriving a class and Polymorphism in java)
Signature means a number of arguments, order of arguments and data type of arguments.
Ex
class A
{
A(){---} // default constrcutor with 0 arguments (i.e, no variable in between ())
A(int,int){---} //Parameterized-constructor with 2 arguments.
A(float,float){---} //Parameterized-constructor.
A(int,float){---} //Parameterized-constructor.
A(float,int){---} //Parameterized-constructor and datatype of arguments are different in the sequence for this parameter and its above parameter. (From topic Deriving a class and Polymorphism in java)
}
Ex
//program related to Deriving a class and Polymorphism in java--constructor overloading.
class ConstructorOverloading
{
public static void main(String args[])
{
Student s1=new Student();
Student s2=new Student(1002,"Ram",21);
s1.showData();
System.out.println();
s2.showData();
}
}
class Student
{
int rollno;
String name;
int age;
Student() //default constructor
{
rollno=1001;
name="Sai";
age=20;
}
Student(int r,String s,int a) //parameterized constructor
{
rollno=r;
name=s;
age=a;
}
void showData()
{
System.out.println("RollNo is: "+rollno);
System.out.println("Name is: "+name);
System.out.println("Age is: "+age);
}
}
Output
Continue to next topic Method Overloading.
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