access class members from main

Question

i'm working with swing builder in java, the form: but I can't access the components from main: how can I get access to the form components?

Answer 1

This is how I solved it

public class firstSwingForm {
private JPanel config;
private JTextField startTxt;
private JTextField dogTextField;
private JPanel mainPanel;
private JTextField a5TextField;
private JButton startBtn;
private static firstSwingForm instance;

public static void main(String args[]) {
    JFrame frame = new JFrame("App");
    instance = new firstSwingForm();
    frame.setContentPane(instance.mainPanel);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);
    instance.startBtn.setText("text can be set");

Answer 2

The issue is that your private JButton startBtn needs to be declared static in order to be accessed within the main method: private static JButton startBtn;

You should also instantiate it as a new object within the main before calling anything on it: startBtn = new JButton(...);

It's also worth noting, by convention, your class name should be FirstSwingForm , and think through whether or not those instance variables will be used elsewhere or if they can be defined within main.