Temperature Converter

import java.io.*;
class Temperature
{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 int ch;
 double cel,Fah;
 void convert() throws IOException
 {
     System.out.println("1.Celsius to Fahrenheit");
     System.out.println("2.Fahrenheit to Celsius");
     System.out.println("Enter choice(1/2)");
     ch=Integer.parseInt(br.readLine());
     switch(ch)
     {

     case 1: System.out.println("Enter temperature in Celsius");
             cel=Double.parseDouble(br.readLine());
             Fah=(9*cel)/5+32;
             System.out.println("Converted temperature in Fahrenheit = "+Fah);
             break;
     case 2: System.out.println("Enter temperature in Fahrenheit");
             Fah=Double.parseDouble(br.readLine());
             cel=(Fah-32)*5/9;
             System.out.println("Converted temperature in Celsius = "+cel);
             break;
    default: System.out.println("Invalid choice");
             break;
    }



 }
 public static void main(String args[])
 {
  Temperature t=new Temperature();
  t.convert();
}
}