从命令行到GUI

Question

What is the right approach to end up with a GUI Java program? Explain: I want to make a program that has a gui. Should i complete my program as command line aplplication and then creating the gui? Or start with ex WindowBuilder, Java Fx and make it as a GUI application from the beggining? Assume that i have a user input using Scanner. When i want to end up with GUI should i have to change all the code to take input from JTextField? Be more specific: I have the following code

    //Add task to the List
    public void AddToList() {
    myList.add(task.setTaskDesc());
    System.out.println("New item " + task.tascDesc + " is added in your task list!");
}

The AddToList method takes user (scanner input) and creates a task added in the list. So i have to change ALL the code to become GUI? Its a general purpose question jast to understand wich is the normal way to make a full program as most of the programs need a GUI.

Answer 1

It is best to seperate your algorithm/logic from the user interface (UI). So all input should be passed as function parameter to your logic. Later to you can then decide wether it comes from a graphical user interface (GUI) or is passed over from the commandline. Also the output should be a UI independend datastructure. Then you can visualize it later both as plan Text or graphically.

Answer 2

Well, i can tell you from my experience what i consider as a good option. You want to use the terminal or the console with System class which i consider a good option but only when you have a consola or a terminal. Well, you can use the terminal input arguments and pass them to the main function to other function wich is used in the controller class of you JavaFX application. In this case i will recomend you use only the args as a alternative mode in the inputs that your program can manage. In case that you have used nmap application as example, you can see that the inputs from the terminal can be provided from the terminal to the GUI application. But i don't recommend you to use one terminal application or one terminal input for passing values to the GUI terminal, i mean you can but i don't recommend you. In case that you want, you can pass values from the main function to as args value to the controller class and manage what do you want, or using System.in or what you want to the java controller class you can do it.

But the best option is to use sceneBuilder for bulding the application and gives the logic to the javaFXController.java class which is in charge to manage the values. The first step: To build the components from sceneBuilder always providing the fx:id and the handler name for the component.

Second step: Manage the values that you want from the GUI Third Step: Manage the values from the terminal to the application but it is trivial

Good luck!