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copied!<p>You have to add the constraint object in the <code>add()</code></p> <p>Example :</p> <pre><code>add(username_Field, c); </code></pre> <p>Where <code>c</code> is your GridBagConstraints.</p> <p>Here is a full example :</p> <pre><code>package gui; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.WindowConstants; @SuppressWarnings("serial") public class LoginPanel extends JPanel { private static final Dimension TFIELD_SZ = new Dimension(120, 20); public LoginPanel() { super(new GridBagLayout()); final GridBagConstraints cst = new GridBagConstraints(); cst.insets = new Insets(0, 5, 0, 5); cst.weightx = 0.5; cst.weighty = 0.5; cst.anchor = GridBagConstraints.LINE_START; // Username cst.gridx = 0; cst.gridy = 0; this.add(new JLabel("Username:"), cst); cst.gridy = 1; cst.gridwidth = 2; final JTextField uTField = new JTextField(); uTField.setMinimumSize(TFIELD_SZ); uTField.setPreferredSize(TFIELD_SZ); this.add(uTField, cst); // Password cst.gridwidth = 1; cst.gridy = 2; this.add(new JLabel("Password:"), cst); cst.gridy = 3; cst.gridwidth = 2; final JTextField pwTField = new JTextField(); pwTField.setMinimumSize(TFIELD_SZ); pwTField.setPreferredSize(TFIELD_SZ); this.add(pwTField, cst); // Buttons cst.anchor = GridBagConstraints.CENTER; cst.gridy = 4; cst.gridwidth = 1; this.add(new JButton("Sign in"), cst); cst.gridx = 1; this.add(new JButton("Sign up"), cst); } public static void main(final String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { final JDialog myDialog = new JDialog(); myDialog.setTitle("Sign in"); myDialog.setSize(180, 170); myDialog.setContentPane(new LoginPanel()); myDialog.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE); myDialog.setVisible(true); } }); } } </code></pre>

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