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MethodOverloding.java
MethodOverloding.java
 
 
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readme.md

☕ Java Lesson – Method Overloading (Compile-Time Polymorphism)

Is lesson me hum seekhenge:

  • Method overloading kya hota hai
  • Overloading ke rules
  • Compile-time polymorphism ka role
  • Method overloading ke different cases
  • Example programs

1️⃣ Method Overloading Kya Hota Hai?

Jab ek hi class me same method name ho lekin:

parameters different ho

to use Method Overloading kehte hain.

Example:

add(int a, int b)
add(int a, int b, int c)

2️⃣ Method Overloading Ka Purpose

Method overloading ka use hota hai:

same functionality ke liye different inputs handle karne ke liye

Example:

print(int)
print(double)
print(String)

3️⃣ Basic Example

class Calculator {

    int add(int a, int b){
        return a + b;
    }

    int add(int a, int b, int c){
        return a + b + c;
    }
}

public class Test {

    public static void main(String[] args){

        Calculator c = new Calculator();

        System.out.println(c.add(2,3));
        System.out.println(c.add(2,3,4));
    }
}

Output

5
9

4️⃣ Method Overloading Rules

Method overload hone ke liye:

✔ Method name same hona chahiye
✔ Parameters different hone chahiye

Parameters different hone ke 3 tarike:

1. Number of parameters different
2. Data type different
3. Order of parameters different

5️⃣ Case 1 – Different Number of Parameters

class Demo {

    void show(){
        System.out.println("No parameter");
    }

    void show(int a){
        System.out.println("One parameter");
    }

    void show(int a, int b){
        System.out.println("Two parameters");
    }
}

6️⃣ Case 2 – Different Data Type

class Demo {

    void print(int a){
        System.out.println("Integer: " + a);
    }

    void print(double a){
        System.out.println("Double: " + a);
    }
}

7️⃣ Case 3 – Different Order of Parameters

class Demo {

    void display(int a, String b){
        System.out.println(a + " " + b);
    }

    void display(String b, int a){
        System.out.println(b + " " + a);
    }
}

8️⃣ Invalid Overloading (Return Type Only)

Sirf return type change karne se overloading nahi hoti.

❌ Invalid example:

class Demo {

    int add(int a, int b){
        return a + b;
    }

    double add(int a, int b){
        return a + b;
    }
}

Compiler error:

method add(int,int) is already defined

9️⃣ Method Overloading and Compile-Time Polymorphism

Method overloading ko kehte hain:

Compile-time Polymorphism

Kyunki:

Compiler decide karta hai kaunsa method call hoga

Example:

Demo d = new Demo();

d.print(5);      // int version
d.print(5.5);    // double version

🔟 Constructor Overloading

Constructors bhi overload ho sakte hain.

class Student {

    Student(){
        System.out.println("Default Constructor");
    }

    Student(String name){
        System.out.println("Name: " + name);
    }
}

1️⃣1️⃣ Real-Life Example

class Printer {

    void print(String text){
        System.out.println(text);
    }

    void print(int number){
        System.out.println(number);
    }

    void print(String text, int number){
        System.out.println(text + " " + number);
    }
}

Usage:

Printer p = new Printer();

p.print("Hello");
p.print(10);
p.print("Score", 95);

1️⃣2️⃣ Overloading vs Overriding

Feature Overloading Overriding
Location Same class Parent + Child class
Parameters Different Same
Polymorphism Compile-time Run-time

🎯 Interview Questions

1️⃣ Method overloading kya hota hai?
2️⃣ Kya return type change karne se overloading hoti hai?
3️⃣ Method overloading compile-time polymorphism kyun hai?
4️⃣ Constructor overloading kya hota hai?
5️⃣ Overloading aur overriding me difference kya hai?

🧾 Lesson Summary

Is lesson me humne seekha:

✔ Method overloading concept
✔ Overloading rules
✔ Compile-time polymorphism
✔ Constructor overloading
✔ Valid aur invalid cases

Method overloading code ko readable, flexible aur reusable banata hai.