Method Overloading in Java

#programming #coding #java #beginners

Method Overloading is a feature in Java where multiple methods have the same name but different parameters.

It helps improve code readability and allows you to use the same method name for different tasks.

Rules for Method Overloading
To overload a method, you must change at least one of the following:

Number of parameters
Type of parameters
Order of parameters

Changing only the return type is NOT allowed

Example 1: Different Number of Parameters

class Calci {

    public static void main(String[] args) {
        Calci obj = new Calci();

        System.out.println(obj.add(10, 20));      
        System.out.println(obj.add(10, 20, 30));  
    }

    int add(int a, int b) {
        System.out.println("2 arguments");
        return a + b;
    }

    int add(int a, int b, int c) {
        System.out.println("2 arguments");
        return a + b + c;
    }
}

Output

Example 2: Different Data Types

class Student {


    public static void main(String[] args) {
        Student obj = new Student();

        obj.show(100);
        obj.show("Harini");
    }

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

    void show(String a) {
        System.out.println("String: " + a);
    }
}

Output

Example 3: Order of Parameters

class Test {

    public static void main(String[] args) {
        Test obj = new Test();

        obj.print(10, "Java");
        obj.print("Hello", 20);
    }

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

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