Java program to find the perimeter of a Circle, Rectangle and Triangle

Perimeter of Circle, Rectangle and Circle:

import java.util.Scanner;
public class Perimeter
{
    int r, l, b, s1, s2, s3;
    double pi = 3.14,perimeter;
    Scanner s = new Scanner(System.in);
    void circle()
    {
        System.out.print("Enter radius of circle:");
        r = s.nextInt();
        perimeter = 2 * pi * r;
        System.out.println("Perimeter of circle:"+perimeter);
    }
    void rectangle()
    {
        System.out.print("Enter length of rectangle:");
        l = s.nextInt();
        System.out.print("Enter breadth of rectangle:");
        b = s.nextInt();
        perimeter = 2 * (l + b);
        System.out.println("Perimeter of rectangle:"+perimeter);
    }
    void triangle()
    {
        System.out.print("Enter length of first side of triangle:");
        s1 = s.nextInt();
        System.out.print("Enter length of second side of triangle:");
        s2 = s.nextInt();
        System.out.print("Enter length of third side of triangle:");
        s3 = s.nextInt();
        perimeter = s1 + s2 + s3;
        System.out.println("Perimeter of triangle:"+perimeter);
    }
    public static void main()
    {
        Perimeter obj = new Perimeter();
        obj.circle();
        obj.rectangle();
        obj.triangle();
    }
}

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