Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;

public class Main {

    public static void main(String[] args) {
        JTextArea ta = new JTextArea(20, 20);
        ((AbstractDocument) ta.getDocument()).setDocumentFilter(new MyFilter());

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new BorderLayout());
        frame.add(new JScrollPane(ta));
        frame.pack();
        frame.setVisible(true);
    }
}

class MyFilter extends DocumentFilter {
    @Override
    public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attrs)
            throws BadLocationException {
        if (offset >= fb.getDocument().getLength()) {
            System.out.println("Added: " + text);
        } else {
            String old = fb.getDocument().getText(offset, length);
            System.out.println("Replaced " + old + " with " + text);
        }
        super.replace(fb, offset, length, text, attrs);
    }

    @Override
    public void insertString(DocumentFilter.FilterBypass fb, int offset, String text, AttributeSet attr)
            throws BadLocationException {
        System.out.println("Added: " + text);
        super.insertString(fb, offset, text, attr);
    }

    @Override
    public void remove(DocumentFilter.FilterBypass fb, int offset, int length) throws BadLocationException {
        System.out.println("Removed: " + fb.getDocument().getText(offset, length));
        super.remove(fb, offset, length);
    }

}