无法访问扩展 JPanel 的 class 的公共成员

Question

Here is my class

import javax.swing.*;
import java.util.Map;

public class NewOrLoadPanel extends JPanel {
    public DefaultComboBoxModel<String> usernameChoiceList;
    public JRadioButton newCloset = new JRadioButton();
    public JRadioButton loadCloset = new JRadioButton();
    public JButton next;
    public JComboBox usernameChoice;
    ButtonGroup newOrLoad = new ButtonGroup();

    public NewOrLoadPanel(XMLParsed choices) {
        initComponents(choices);
    }

    private void initComponents(XMLParsed choices) {

        newCloset.setText("New Closet File");
        newCloset.setActionCommand("new");
        loadCloset.setText("Load Closet from File...");
        loadCloset.setActionCommand("load");
        newOrLoad.add(newCloset);
        newOrLoad.add(loadCloset);
        next = new JButton("Next");
        add(loadCloset);
        add(newCloset);
        JLabel inputLabel = new JLabel("Choose a username from the list below: ");
        add(inputLabel);

        usernameChoiceList = new DefaultComboBoxModel<>();
        for (Map.Entry<String, String> mapEntry : choices.hexUsernameMap.entrySet()) {
            usernameChoiceList.addElement(mapEntry.getKey());
        }
        usernameChoice = new JComboBox(usernameChoiceList);
        add(usernameChoice);

    }
    public String getSelectedAction() {
        return newOrLoad.getSelection().getActionCommand();
    }
}

I'm using the following code to create it and I am trying to access the user input from the panel components.

private void newOrLoadChooser() {
        hexUserObject = new XMLParsed();
        JPanel dialogPanel = new NewOrLoadPanel(hexUserObject);
        int result = JOptionPane.showConfirmDialog(null, dialogPanel, "", JOptionPane.OK_CANCEL_OPTION);
        boolean userChoice = dialogPanel.getComponent(1).isFocusOwner();
        if (userChoice == true) { // new file
            newClosetChooser();
            myInv = new ParsedInventory(hexValue, username);
            validateFolders(myInv.getUsername());
        }
        else {
            myInv = loadInventoryFile();
            validateFolders(myInv.getUsername());

        }

    }

note: some of these variables have global scope in the class calling this function. So the code compiles and runs, and shows the dialog etc.

I'm trying to make userChoice reflect the radio button selection. However, I cannot access the radio buttons directly via dialogPanel.newCloset or dialogPanel.loadCloset as it tells me it does not exist.

So I tried making the button group a public attribute, too. And tried retrieving the String using dialogPanel.newOrLoad.getSelection().getActionCommand() but that also was acting like it didn't exist.

So I tried making that getter for the getActionCommand() as above and it can't find that public function either.

I have other classes that extend JPanel that have accessible public attributes. I don't get what's wrong here. All I can think is that the dialogPanel is getting destroyed when the dialog closes, except in my debugger it's still showing all the components existing. And well, if it is the case that those things aren't persisting.. how do I fix this? I'd prefer not to build the panel inside my function as I want to keep things clean.

Answer 1

I think you can use NewOrLoadPanel type directly instead of JPanel :

NewOrLoadPanel dialogPanel = new NewOrLoadPanel(hexUserObject);

int result = JOptionPane.showConfirmDialog(null, dialogPanel, "", JOptionPane.OK_CANCEL_OPTION);
boolean isLoadCloset = dialogPanel.loadCloset.isSelected();
boolean isNewCloset = dialogPanel.newCloset.isSelected();