Java OOP 2

Membuat aplikasi pengaturan suhu AC, ini sederhana banget dan ribet mungkin, hehe

public class AturSuhu{
    private static String A = "a";
    private static String B = "b";
    private static Integer ta,tb,tc,cs1,cs2,cs3;
    private static Integer Suhu;
    private static double jam;
       
public static  void  main (String args[])throws IOException
{
    BufferedReader bufferedReader = new BufferedReader (new InputStreamReader (System.in));
   
    ta = 1;
    tb = 2;
    tc = 3;
    cs1 = 3;
    cs2 = 5;
    cs3 = 7;
    jam = 9.25;
       
    System.out.println("Welcome in Electro Factory AC App \nBy Dewi Setiarini 1112091000037");
    System.out.println("Date : January 7, 2013 \nTime : "+jam);
    System.out.println("Menu :\n[a] Turn On \n[b] Turn Off");
    System.out.print("Chose Menu : ");
   
    String input1 = bufferedReader.readLine();
   
  
    if (input1.equals(A))
    {
      
       System.out.println("Air Conditioner is On");
      
       System.out.print("Insert Temperature that You Want : ");
       Integer suhu = Integer.parseInt(bufferedReader.readLine());
       System.out.println("The Current Temperature is "+suhu+" Degrees Celcius");
      
       System.out.println("Comfort Sleep :\n[1] 3 Hours \n[2] 5 Hours \n[3] 7 Hours");
       System.out.print("Chose Comfort Sleep's Time : ");
      
       Integer input2 = Integer.parseInt(bufferedReader.readLine());
         
        if (input2.equals(ta))
        {
            suhu=suhu+cs1/2+cs1/2;
            System.out.println("Comfort Sleep is "+cs1+" Hours \nAC will be turn off in "+suhu+" Degrees Celcius at "+(jam+cs1)+"\nThank You, Enjoy Your Day :)");
        }
        else if(input2.equals(tb))
        {
            suhu=suhu+cs2/2+cs2/2;
            System.out.println("Comfort Sleep is "+cs2+" Hours \nAC will be turn off in "+suhu+" Degrees Celcius at "+(jam+cs2)+"\nThank You, Enjoy Your Day :)");
        }
        else if(input2.equals(tc))
        {
            suhu=suhu+cs3/2+cs3/2;
            System.out.println("Comfort Sleep is "+cs3+" Hours \nAC will be turn off in "+suhu+" Degrees Celcius at "+(jam+cs3)+"\nThank You, Enjoy Your Day :)");
        }
        else
        {
            System.out.println("Sorry, Your input is Wrong, You must insert 1, 2, or 3.");
            System.exit(0);
        }
    }
   
   
    else if(input1.equals(B))
    {
       System.out.println("Air Conditioner is Off, Thank You :)");
    }
    else
    {
        System.out.println("Sorry, Your input is Wrong, You must insert a or b.");
        System.exit(0);
    }
   
}   
}








Selamat mencoba ^_^