“Is-a” relationship is basic element of OOP.
This functionality is helps to achieve re-useabilty in our code.
Basically “Is-a” relationship also called parent-child relationship between two classes.
We divide our code int o classes such that common functionality kept in one class called parent class and remaining in child class which inherits the parent class.
A little JAVA example to achieve “is-a” relation ship is described below
public class Animal{
}
public class Mammal extends Animal{
}
public class Reptile extends Animal{
}
public class Dog extends Mammal{
}
“extends” keyword used for inheritance in java.
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