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

public class SharedModel {

  public static void main(String[] args) {
	JFrame frame = new JFrame("Shared Model");

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

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

	frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    frame.setSize(300, 300);
    frame.setVisible(true);
  }
}