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Java Program to calculate the area of Circle, rectangle, Square using method Overloading.

Java Code Example — Polymorphism Programs

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Java Program to calculate the area of Circle, rectangle, Square using method Overloading.

Objective

Calculate the area of a Circle, Rectangle, and Square using Method Overloading.

Algorithm / Approach

  1. Create an Area class.
  2. Define area(double r) to calculate the area of a circle (PI * r * r).
  3. Define area(int a, int b) to calculate the area of a rectangle (a * b).
  4. Define area(int a) to calculate the area of a square (a * a).
  5. In main, call the area() method three times, passing different sets of arguments.
Area.java 
class Area {
 void area(double r) {
  double ar = 3.14*r*r;
  System.out.println("Cirlce Area = "+ar);
 }
 void area(int a, int b) {
  int ar = a*b;
  System.out.println("Rectangle Area = "+ar);
 }
 void area(int a) {
  double ar = a*a;
  System.out.print("Square Area = "+ar);
 }
 public static void main(String[] a)
 {
  Area obj = new Area();
  obj.area(4.5);
  obj.area(3,4);
  obj.area(5);
 }
}

Expected Output

Cirlce Area = 63.585
Rectangle Area = 12
Square Area = 25.0

Explanation of the Program

  • This program perfectly demonstrates why method overloading is useful. Instead of forcing the programmer to remember three different method names (like circleArea(), rectArea(), squareArea()), we just use one intuitive name: area().
  • The compiler automatically knows which mathematical formula to execute based on whether you pass one decimal (Circle), two integers (Rectangle), or one integer (Square).

Complexity

Time Complexity O(1)
Space Complexity O(1)
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