import java.io.IOException;
import java.io.*;
import java.util.Scanner;

public class Menu {
    Scanner scan = new Scanner(System.in);
    int selection;

    public int GetSelection()
   {
       selection = scan.nextInt();
       return selection;
   }

    public void display()
    {

          System.out.println("Please choose an option from the following:");
          System.out.println("[1] Convert Decimal to Binary");
          System.out.println("[2] Convert Decimal to Hexadecimal");
          System.out.println("[3] Convert Binary to Decimal");
          System.out.println("[4] Convert Binary to Hexadecimal");
          System.out.println("[5] Convert Hexadecimal to Decimal");
          System.out.println("[6] Convert Hexadecimal to Binary");
          System.out.println("[0] Exit");

          System.out.println("n");
          System.out.println("You entered: " + selection);
   }

}


----------------------------
import java.io.*;
import java.lang.*;
import java.util.Scanner;


public class Driver
{

    public static void main(String[] args)throws IOException {

            LineWriter lw = new LineWriter("csis.txt");
            int selection;

            Decimal dec = new Decimal();
            Binary bin = new Binary();
            Hexadecimal hex = new Hexadecimal();
            Menu menu = new Menu();


        do{
            menu.display();

            selection=menu.GetSelection();

            switch (selection){

            case '1':{ dec.getDec();
                      break;}
            case '2':{ dec.getHex();
                      break;}
            case '3':{ bin.getBin();
                      break;}
            case '4':{ bin.getHex();
                      break;}
            case '5':{ hex.getHex();
                      break;}
            case '6': { hex.getDec();
                      break;  }
            //default: System.out.println("Error: Unrecognized Selection");
            //          break;

           }
        }while (selection !=0);
    }
}

switch(selection){

case '1':
    System.out.println("Hello World from char");
    break;

case 1:
    System.out.println("Hello World from int");
    break;
}