creating a GUI input option

I want to create a GUI and Script input option. So I need to add an input argument flag and program logic to use Scanner if false, JOptionPane if true. But i am having trouble doing this.

This is as far as i can get my code because I cant figure out how to get the if else statements and everything to work correctly.

import javax.swing.JOptionPane;
import java.util.Scanner;
import java.util.Calendar;    

public class UtilsFL {


public static int readInt(String prompt) {



    Scanner input = new Scanner(System.in);
    int data;

    System.out.print(prompt);
    data = input.nextInt();

    return data;



    }