contoh tebak umur

package javaapplication1;
import java.io.*;
class baca
{
    public static String bacaString ()
    {
        int karakter;
        String str="";
        boolean selesai = false;
        while (!selesai)
        {
            try
            {
                karakter = System.in.read ();
                if (karakter<0 || (char) karakter =='\n')
                {
                    selesai = true;
                }
                else if ( (char) karakter !='r')
                {
                    str = str + (char) karakter;
                }
            }
            catch (java.io.IOException e)
            {
                System.err.println("ada kesalahan");
                selesai = true;
            }
        }
        return str;
    }
}
public class Main{
    public static void main(String [] fu){
        System.out.println("masukkan usia anda ..?");
        String a = baca.bacaString();
        int awal = Integer.parseInt(a);
        if (awal<=12)
        {
            System.out.println("o0o...masih SD toch..!!! ");
        }
        else if (awal<=15)
        {
          System.out.println("oo..udah SMP toch ..!!!");
        }
        else if (awal<=18)
        {
            System.out.println("waduch dah SMA nich..!!!");
        }
        else{
           System.out.println("wew...anda sudah tua nich.") ;
        }
     }
 }