JFrame and SpringLayout.

[new_2_java]

Hi all,

I have a simple JFrame windows with two JLabel, two JTextField and two JButton. I use SpringLayout to display controls in on the frame. But when I run the application, the windows is displayed in a very small size. Only the two buttons are displayed. But when I maximize the window all the controls are placed properly.

So, I think, the setSize() is not functioning properly. Can someone please tell me what i am doing wrong? Appreciate your help. Here's the code for this:

public class Login extends JFrame implements ActionListener {
	public Login () {
		super("Title");
		this.getContentPane().setLayout(new BorderLayout());
		
		JPanel btnPane = new JPanel();
		btnPane.setLayout(new FlowLayout());
		
		JPanel pane = new JPanel();
		SpringLayout sp = new SpringLayout();
		pane.setLayout(sp);
		
		pane.add(lblUserName);
		pane.add(txtUserName);
		pane.add(lblPassword);
		pane.add(txtPassword);
		
        sp.putConstraint(SpringLayout.WEST, lblUserName, 70, SpringLayout.WEST, this);
        sp.putConstraint(SpringLayout.NORTH, lblUserName, 20, SpringLayout.NORTH, this);
        
        sp.putConstraint(SpringLayout.WEST, txtUserName, 5, SpringLayout.EAST, lblUserName);
        sp.putConstraint(SpringLayout.NORTH, txtUserName, 20, SpringLayout.NORTH, this);
        
        sp.putConstraint(SpringLayout.WEST, lblPassword, 70, SpringLayout.WEST, this);
        sp.putConstraint(SpringLayout.NORTH, lblPassword, 5, SpringLayout.SOUTH, lblUserName);
        
        sp.putConstraint(SpringLayout.WEST, txtPassword, 5, SpringLayout.EAST, lblPassword);
        sp.putConstraint(SpringLayout.NORTH, txtPassword, 5, SpringLayout.SOUTH, txtUserName);
        
    	btnLogin.addActionListener(this);
		btnCancel.addActionListener(this);
		
		btnPane.add(btnLogin);
		btnPane.add(btnCancel);
		
		this.getContentPane().add("Center", pane);
		this.getContentPane().add("South",btnPane);
		
	}
	public static void main (String[] args) {
		Login login = new Login();
		login.setSize(200, 300);
        login.setLocation(200,200);
		login.pack();
		login.setVisible(true);
	}
	public void actionPerformed(ActionEvent e) {
		// do some actions		
	}	
	private JLabel lblUserName = new JLabel("User name: ");
	private JTextField txtUserName = new JTextField(15);
	private JLabel lblPassword = new JLabel("Password : ");
	private JPasswordField txtPassword = new JPasswordField(15);
	
	private JButton btnLogin = new JButton("Login");
	private JButton btnCancel = new JButton("Cancel");
}

Thanks in advancve

[Fubarable]

Why are you fixated on the SpringLayout here? This can be implemented with the GridBagLayout or a combination of different layouts. Myself, I like to create two JPanels like so:

JPanel labelPanel = new JPanel(new GridLayout(0, 1, 0, 10));
JPanel fieldPanel = new JPanel(new GridLayout(0, 1, 0, 10));

and add the JLabels ("User Name:" and "Password:") to the labelPanel and the JTextField and JPasswordField to the fieldPanel. I then add these panels to the contentPane BorderLayout.WEST and BorderLayout.CENTER respectively.