public class pruebaSubstring{
    public static void main(String[] args) {
        String cadena_a,cadena_b,cadena_c="GeekyTheory";
          //substring(beginIndex,endIndex)
        cadena_a = cadena_c.substring(0,5);
          //subtring(beginIndex)
        cadena_b = cadena_c.substring(5);
    }
}