GridBagLayout - JFormattedTextFields are too little?

Question

I am coding a gui in SWING:

    JLabel tLabel1 = new JLabel("Name: ");
    JFormattedTextField tTextField1 = new JFormattedTextField();
    textBoxes.add(tTextField1);
    JLabel tLabel2 = new JLabel("Maximaler Preis: ");
    JFormattedTextField tTextField2 = new JFormattedTextField();
    textBoxes.add(tTextField2);

        GridBagLayout tLayout = new GridBagLayout();
        mainFrame.getContentPane().setLayout(tLayout);
//      tLayout).setAutoCreateGaps(true);
//      tLayout.setAutoCreateContainerGaps(true);

        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        gbc.anchor = GridBagConstraints.WEST;

        mainFrame.add(new JLabel("Geben sie bitte die Kriterien für die Suche an:"), gbc);

        gbc.gridwidth = 1;
        gbc.gridy++;
        mainFrame.add(tLabel1, gbc);
        gbc.gridy++;
        mainFrame.add(tLabel2, gbc);
        gbc.gridy++;
        mainFrame.add(tLabel3, gbc);
        gbc.gridy++;
        mainFrame.add(tLabel4, gbc);

        gbc.gridx++;
        gbc.gridy = 1;
        mainFrame.add(tTextField1, gbc);
        gbc.gridy++;
        mainFrame.add(tTextField2, gbc);
        gbc.gridy++;
        mainFrame.add(tTextField3, gbc);    
        gbc.gridy++;
        mainFrame.add(tCombo, gbc);
        gbc.gridy++;
        mainFrame.add(searchButton, gbc);

        gbc.gridy++;
        gbc.gridx = 0;
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        gbc.fill = GridBagConstraints.HORIZONTAL;

        mainFrame.add(tTable, gbc); 
        mainFrame.setSize(800, 500);
        mainFrame.pack();

My text field look like that:

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How to give them a width in the GridBagLayout?

Answer 1

See JTextField.setColumns(int).