Java tutorial
import java.awt.Container; import java.awt.GridLayout; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; import javax.swing.text.Document; public class Main extends JFrame { JLabel nameLabel = new JLabel("Name:"); JLabel mirroredNameLabel = new JLabel("Mirrored:"); JTextField name = new JTextField(20); JTextField mirroredName = new JTextField(20); public Main() { this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.setLayout(new GridLayout(2, 0)); Container contentPane = this.getContentPane(); contentPane.add(nameLabel); contentPane.add(name); contentPane.add(mirroredNameLabel); contentPane.add(mirroredName); Document nameModel = name.getDocument(); mirroredName.setDocument(nameModel); pack(); setVisible(true); } public static void main(String[] args) { Main frame = new Main(); } }