//file: SharedModel.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SharedModel extends JFrame {

  public SharedModel(  ) {
    super("SharedModel v1.0");
    setSize(300, 300);
    setLocation(200, 200);

    JTextArea areaFiftyOne = new JTextArea(  );
    JTextArea areaFiftyTwo = new JTextArea(  );
    areaFiftyTwo.setDocument(areaFiftyOne.getDocument(  ));
    JTextArea areaFiftyThree = new JTextArea(  );
    areaFiftyThree.setDocument(areaFiftyOne.getDocument(  ));

    Container content = getContentPane(  );
    content.setLayout(new GridLayout(3, 1));
    content.add(new JScrollPane(areaFiftyOne));
    content.add(new JScrollPane(areaFiftyTwo));
    content.add(new JScrollPane(areaFiftyThree));
    setVisible(true);
  }

  public static void main(String[] args) {
    JFrame f = new SharedModel(  );
    f.addWindowListener(new WindowAdapter(  ) {
      public void windowClosing(WindowEvent we) { System.exit(0); }
    });
    f.setVisible(true);
  }
}