Eclipse project wont run

Question

I'm new to eclipse and java, I'm trying to switch between two panels with the use of a button. i want to test my project but when i try to run it it launches, gives no errors and then nothing happens.

Have i missed something that i need to do before to make this run?

This is the version i have and i downloaded it earlier today.

Eclipse IDE for Java Developers

Version: 2019-09 R (4.13.0) Build id: 20190917-1200

And below is my code if there is anything stopping it from working in there.

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.Font;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class Music_Test {

    private JFrame frame;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Music_Test window = new Music_Test();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public Music_Test() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.setBounds(100, 100, 450, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        JPanel Menu = new JPanel();
        Menu.setBounds(6, 6, 438, 266);
        frame.getContentPane().add(Menu);
        Menu.setLayout(null);
        Menu.setVisible(true);

        JPanel Select_Level = new JPanel();
        Select_Level.setBounds(6, 6, 438, 266);
        frame.getContentPane().add(Select_Level);
        Select_Level.setVisible(false);

        JButton btnSelectLevel = new JButton("Select Level");
        btnSelectLevel.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                Menu.setVisible(false);
                Select_Level.setVisible(true);
            }
        });
        btnSelectLevel.setBounds(158, 45, 117, 29);
        Menu.add(btnSelectLevel);

        JLabel lblMenu = new JLabel("Menu");
        lblMenu.setFont(new Font("Comic Sans MS", Font.BOLD, 22));
        lblMenu.setBounds(187, 17, 61, 29);
        Menu.add(lblMenu);

        JLabel lblSelectLevel = new JLabel("Select Level");
        lblSelectLevel.setFont(new Font("Comic Sans MS", Font.BOLD, 22));
        lblSelectLevel.setBounds(187, 17, 61, 29);
        Select_Level.add(lblSelectLevel);


    }
}

Answer 1

Start by using a different layout manager, FlowLayout or GridBagLayout might work better

JPanel centerPanel = new JPanel(new FlowLayout());
centerPanel.add(openReportSelection);     
centerPanel.add(closeButton); 

These layouts will honour the preferred sizes of your buttons

As for opening another window, well, you've already create one, so the process is pretty much the same. Having said that, you might consider having a look at The Use of Multiple JFrames: Good or Bad Practice? before you commit yourself to far.

A better approach might be to use a JMenuBar and JMenuItems to act as the "open" and "exit" actions. Take a look at How to Use Menus then you could use a CardLayout to switch between views instead, for example

From a pure design perspective (I know it's only practice, but perfect practice makes perfect), I wouldn't extend anything from JFrame and instead would rely on building your main GUIs around something like JPanel instead.

This affords you the flexibility to decide how to use these components, as you could add them to frames, applets or other components...

AND

Although you have implemented the actionPerformed method as per the ActionListener interface, you class is not of that that type as you haven't implemented the interface. Once you implement that interface and register it with the JButton btnAdd,

btnAdd.addActionListener(this);

the method will be called.

A more compact alternative might be to use an anonymous interface:

btnAdd.addActionListener(new ActionListener() {
   @Override
   public void actionPerformed(ActionEvent e) {
      // handle button ActionEvent & display dialog...    
   }
});

Side notes:

Using more than one JFrame in an application creates a lot of overhead for managing updates that may need to exist between frames. The preferred approach is to use a modal JDialog if another window is required. This is discussed more Here