MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;

public class MainClass {
    public static void main(String[] args) throws Exception {
        JTextField field = new JTextField(30);

        ((AbstractDocument) (field.getDocument())).setDocumentFilter(new DocumentFilter() {
            public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr)
                    throws BadLocationException {
                System.out.println("insert");
                fb.insertString(offset, string.toUpperCase(), attr);
            }

            public void replace(FilterBypass fb, int offset, int length, String string, AttributeSet attr)
                    throws BadLocationException {
                System.out.println("replace");
                fb.replace(offset, length, string.toUpperCase(), attr);
            }
        });

        JFrame frame = new JFrame("User Information");
        frame.getContentPane().add(field);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}