Coding with Java is funny in programming world, due to it’s platform independence and security. This is a Java program to find area of a rectangle, circle and triangle using method overloading. Method overloading is one of the ways that Java implements polymorphism. When an overloaded method is invoked, Java uses the type and number of arguments to determine which version of the overloaded method to actually call. Thus, overloaded methods must differ in the type and number of parameters.

Manually we can find the **area** of a rectangle by using equation:

Area = Breadth * Length

Also we can find the area of a **circle** by using equation:

Area = 3.14 * (radius)2

And we can find the area of a **triangle** by using equation:

a = length of first side b = length of second side c = length of third sides = (a + b+ c)/2Area = sqrt(s-where sqrt stands for square root(s-a)(s-b)*(s-c))

__Java Program Code for find area with method overloading:__

```
import java.io.*;
class area
{
void findarea(int a, int b)
{
System.out.println( "\n Area of rectangle with breadth "+a+" and lenght " +b+ " is :" + a*b);
}
void findarea(int a)
{
System.out.println( "\n Area of circle with radius " +a+ " is :" + 3.14 * a);
}
void findarea(int a, int b, int c)
{
double temp = (a + b + c);
double s= temp/2;
double triarea = Math.sqrt(s*(s-a)*(s-b)*(s-c));
System.out.println( "\n Area of triangle with lenght of sides "+a+"," +b+ " and " +c+" is : "+ triarea);
}
public static void main(String p[]) throws IOException
{
area d = new area();
BufferedReader Br = new BufferedReader(new InputStreamReader(System.in));
System.out.print("\n Find area of \n 1 . Rectangle \n 2 . Triangle \n 3 . Circle \n\nSelect a choice : ");
int choice =Integer.parseInt(Br.readLine());
switch(choice)
{
case 1:
System.out.print("\n Enter the breadth : ");
int a =Integer.parseInt(Br.readLine());
System.out.print("\n Enter the lenght : ");
int b=Integer.parseInt(Br.readLine());
d.findarea(a,b);
break;
case 2:
System.out.print("\n Enter the lenght of first side : ");
int x =Integer.parseInt(Br.readLine());
System.out.print("\n Enter the lenght of second side : ");
int y=Integer.parseInt(Br.readLine());
System.out.print("\n Enter the lenght of third side : ");
int z =Integer.parseInt(Br.readLine());
d.findarea(x,y,z);
break;
case 3:
System.out.print("\n Enter the radius : ");
int r =Integer.parseInt(Br.readLine());
d.findarea(r);
break;
default:
System.out.println("Invalid choice");
}
}
}
```

Here class name is ‘area’, so you must save your java file in name of ‘area.java’.

Compile and debug the java code.

__Sample Output:__

Find Area of Rectangle 2 . Triangle 3 . Circle Select a choice: 1 Enter the breadth: 3 Enter the length: 5 Area of rectangle with breadth 3 and length 5 is : 15

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