Input Verifier Example : Data Validation « Swing Components « Java

Input Verifier Example

Code revised from Desktop Java Live:

import javax.swing.BorderFactory;
import javax.swing.InputVerifier;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

import com.jgoodies.forms.builder.DefaultFormBuilder;
import com.jgoodies.forms.layout.FormLayout;

public class InputVerifierExample extends JPanel {
    private JLabel validationLabel;

    public InputVerifierExample() {
        DefaultFormBuilder formBuilder = new DefaultFormBuilder(new FormLayout("right:pref, 3dlu, p:g"));
        formBuilder.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

        JTextField javaField = new JTextField();
        JTextField swingField = new JTextField();
        this.validationLabel = new JLabel();

        javaField.setInputVerifier(new StrictInputVerifier("Java"));
        swingField.setInputVerifier(new StrictInputVerifier("Swing"));

        formBuilder.append("Java Field:", javaField);
        formBuilder.append("Swing Field:", swingField);
        formBuilder.append(validationLabel, 3);


    private class StrictInputVerifier extends InputVerifier {
        private String validString;

        public StrictInputVerifier(String validString) {
            this.validString = validString;

        public boolean verify(JComponent input) {
            JTextField textField = (JTextField) input;
            if (validString.equals(textField.getText())) {
                return true;
            } else {
                validationLabel.setText("Field must only contain " + this.validString);
                return false;

    public static void main(String[] a){
      JFrame f = new JFrame("Input Verifier Example");
      f.add(new InputVerifierExample());

 277 k)

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