MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.InputVerifier;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.JTextComponent;

public class MainClass {
    public static void main(String args[]) throws Exception {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JTextField nameTextField = new JTextField();
        frame.add(nameTextField, BorderLayout.NORTH);
        frame.add(new JTextField(), BorderLayout.SOUTH);

        DocumentListener documentListener = new DocumentListener() {
            public void changedUpdate(DocumentEvent documentEvent) {
                printIt(documentEvent);
            }

            public void insertUpdate(DocumentEvent documentEvent) {
                printIt(documentEvent);
            }

            public void removeUpdate(DocumentEvent documentEvent) {
                printIt(documentEvent);
            }

            private void printIt(DocumentEvent documentEvent) {
                DocumentEvent.EventType type = documentEvent.getType();
                String typeString = null;
                if (type.equals(DocumentEvent.EventType.CHANGE)) {
                    typeString = "Change";
                } else if (type.equals(DocumentEvent.EventType.INSERT)) {
                    typeString = "Insert";
                } else if (type.equals(DocumentEvent.EventType.REMOVE)) {
                    typeString = "Remove";
                }
                System.out.print("Type  :   " + typeString + " / ");
                Document source = documentEvent.getDocument();
                int length = source.getLength();
                try {
                    System.out.println("Contents: " + source.getText(0, length));
                } catch (BadLocationException badLocationException) {
                    System.out.println("Contents: Unknown");
                }
            }
        };
        nameTextField.getDocument().addDocumentListener(documentListener);

        frame.setSize(250, 100);
        frame.setVisible(true);
    }
}