Validating Text Input with InputVerifier - Java Swing

Java examples for Swing:Text Input Verifier

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Description

Validating Text Input with InputVerifier

Demo Code

import javax.swing.InputVerifier;
import javax.swing.JComponent;
import javax.swing.JTextField;

public class Main {
  public static void main(String[] args) {
    JTextField areaCodeField = new JTextField(3);
    areaCodeField.setInputVerifier(new InputVerifier() {
      public boolean verify(JComponent input) {
        String areaCode = areaCodeField.getText();
        if (areaCode.length() == 0) {
          return true;
        } else if (areaCode.length() != 3) {
          return false;
        }//from   w  w w  .j  a  v a2s. c  o  m

        try {
          Integer.parseInt(areaCode);
          return true;
        } catch (NumberFormatException e) {
          return false;
        }
      }
    });
  }
}

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