CODEWITHSUNDEEP
javaswingjframe
NandoAndes
NandoAndes

Reputation: 45

Java Swing layout not appearing

I'm just getting into creating GUIs in Java, and with this basic setup, I can't get anything to appear in my JFrame:

public class Main extends JFrame {

public static void main(String[] args) {
    JFrame jframe = new JFrame();
    jframe.setSize(400,400); // setting size
    jframe.setVisible(true); // Allow it to appear
    jframe.setTitle("Lab 7");
    jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Main init = new Main(); 
}  

 public Main() {
    Container pane = getContentPane();
    pane.setBackground(Color.BLUE);
    pane.setLayout(new FlowLayout());
    JButton add = new JButton("Add");
    JButton close = new JButton("Close");
    JTextArea area = new JTextArea();
    JScrollPane scroll = new JScrollPane(area);

    add.setBounds(70, 125, 80, 20);
    close.setBounds(70, 115, 80, 20);
    pane.add(add);
    pane.add(close);
    pane.add(scroll);
    AddClick added = new AddClick();
    add.addActionListener(added);
}
}

I also tried moving all the JFrame stuff into public Main() but it caused an infinite amount of windows opening and I had to end the program each time.

Upvotes: 0

Views: 38

Answers (1)

resueman
resueman

Reputation: 10613

You're creating two separate JFrames: one is your Main class, and the other is an unrelated JFrame. Most of the customization, including adding components, happens to the Main in its constructor. But you only ever set the other JFrame to be visible.

Use your Main instance as the JFrame instead of creating another one, and the problem will be fixed.

public static void main(String[] args) {
    JFrame jframe = new Main(); //Use an instance of Main as your JFrame
    jframe.setSize(400,400); // setting size
    jframe.setVisible(true); // Allow it to appear
    jframe.setTitle("Lab 7");
    jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

Upvotes: 2

Related Questions