GUI using netbeans. Where to create ArrayList

Question

i am using netbeans to create my GUI. I got the following class

• MainUI.java
• Person.java
• Gender.java (Enum)

Inside my MainUI.java are the codes auto generated by netbeans for my UI.

I want to create an ArrayList which will add a Person object into the arraylist when a JButton is clicked.

Where should i place the code ArrayList<Person> list = new ArrayList<Person>(); ?

public class MainUI extends javax.swing.JFrame {

OR

public static void main(String args[]) { .

If i put it in static void main, i could not access the arraylist from my eventhandler code in MainUI etends javax.swing.JFrame

Answer 1

Create a class where you store variables that should be accessed from anywhere in your program.

class Global {
    public static ArrayList<Object> list = new ArrayList<>();
    private Global(){}
}

You would access it like this:

GLobal.list.add(new Object());

Answer 2

我看不到每个实现的内容，建议将其放在MainUI类中，因为每次按下按钮并在MainUI实现该按钮时都会使用MainUI 。