Code example for DefaultFormatterFactory

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    public JTextField getNameTextField() {
        if (nameTextField == null) {
            DefaultFormatter formatter = new DefaultFormatter();
            formatter.setOverwriteMode(false);
            nameTextField = new JFormattedTextField(new DefaultFormatterFactory(formatter));
            nameTextField.addPropertyChangeListener("value", this);
        } 
        return nameTextField;
    } 
 
    public JLabel getNameLabel() {
        if (nameLabel == null) {
            nameLabel = new JLabel("Diagram Name: ");
        } 
        return nameLabel;
    } 
 
    public void configureDiagram(Diagram diagram) {
        this.diagram = diagram;
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