POLYMORPHISM PROGRAM IN JAVA
POLYMORPHISM PROGRAM IN JAVA
Polymorphism in Java allows objects of different classes to respond to the same method call in different ways. This is achieved through method overriding, where a subclass provides its own implementation of a method inherited from a superclass. This enables objects of different types to be treated as objects of a common supertype, making code more flexible and maintainable.
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1 — Introduction: Polymorphism allows objects of different classes to respond to the same method call in a unique and appropriate way.
2) Types of Polymorphism:
Method Overloading: Same method name but with different parameter lists.
Method Overriding: Same method name and parameter list in derived classes.
3) Rules for Method Overriding:
Same method name and parameter list.
Must have wider accessibility in the subclass (public, protected, or default).
Return type must be covariant or the same as the overridden method.
4) Benefits of Polymorphism:
Code flexibility and reusability.
Enhanced extensibility by allowing new classes to inherit and implement polymorphic methods.
Improved maintainability by reducing code duplication.
5) Implementing Polymorphism:
Define a base class with the polymorphic method.
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Create derived classes that override the polymorphic method with their own implementations.
Use polymorphism to invoke the method on objects of different classes.
6) The “super” Keyword:
Used to invoke the overridden method in the superclass.
Ensures correct method behavior and prevents infinite recursion.
7) Examples:
Method Overloading: public int add(int a, int b) and public double add(double a, double b)
Method Overriding: class Animal { public String makeSound() { return "Animal sound"; } } and class Dog extends Animal { @Override public String makeSound() { return "Woof!"; } }
8) Impact on Student Training:
Enhances students’ understanding of object oriented design principles.
Demonstrates the importance of code flexibility and maintainability.
Prepares students for real world scenarios where polymorphism is widely used.
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