Java Program to calculate area of circle using if-else statement

//Program to calculate area of circle using if-else statement
import java.util.*;
class areaofc
     {
public static void main(String args[])
      {
    float n,r,d,area;
    System.out.println(" You want to calculate area of circle using");
    System.out.println(" 1.Radius \n 2.Diameter");
    System.out.println(" Enter your choice:");
    Scanner obj=new Scanner(System.in);
    n=obj.nextFloat();
    if(n==1)
          {
        System.out.println(" Enter radius:");
        r=obj.nextFloat();       
        System.out.println(" Area of circle = "+3.14*2*r);
          }
       
    else if(n==2)
          {
        System.out.println(" Enter diameter:");
        d=obj.nextFloat();       
        System.out.println(" Area of circle = "+3.14*d);
          }
    else
        System.out.println(" Invalid choice ");
       }
     }
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Java Program to calculate area of circle using SWITCH statement