What is method overloading vs overriding?
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Method Overloading vs Method Overriding in Java
Method Overloading and Method Overriding are two key concepts in Java that support polymorphism — allowing code flexibility and reusability.
🔁 Method Overloading (Compile-Time Polymorphism)
Method overloading occurs within the same class when multiple methods have the same name but different parameters (type, number, or order).
Example:
java
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class Calculator {
int add(int a, int b) { return a + b; }
double add(double a, double b) { return a + b; }
int add(int a, int b, int c) { return a + b + c; }
}
Overloaded methods are resolved during compile-time.
Improves readability and reusability.
🔄 Method Overriding (Run-Time Polymorphism)
Method overriding happens when a subclass provides a specific implementation of a method that is already defined in its superclass.
Example:
java
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class Animal {
void sound() { System.out.println("Animal makes sound"); }
}
class Dog extends Animal {
void sound() { System.out.println("Dog barks"); }
}
Overridden methods are resolved during run-time.
Requires inheritance and same method signature.
Allows dynamic behavior and method customization.
🆚 Key Differences
Feature Overloading Overriding
Scope Same class Subclass and superclass
Signature Must differ Must be the same
Polymorphism Compile-time Run-time
Inheritance Not require Required
Both concepts are crucial in writing clean, efficient, and extensible Java code. Overloading simplifies method use, while overriding ensures correct behavior in inheritance hierarchies.
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