import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class ScrollBarDemo extends JFrame implements ActionListener {
  public static final int WIDTH = 600;
  public static final int HEIGHT = 400;
  public static final int LINES = 15;
  public static final int CHAR_PER_LINE = 30;
  private JTextArea memoDisplay;
  private String memo1;
  private String memo2;

  public static void main(String[] args)  {
    ScrollBarDemo gui = new ScrollBarDemo();
    gui.setVisible(true);
  }
  
  public ScrollBarDemo() {
    super("Scroll Bars Demo");
    setSize(WIDTH, HEIGHT);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JPanel buttonPanel = new JPanel();
    buttonPanel.setBackground(Color.LIGHT_GRAY);
    buttonPanel.setLayout(new FlowLayout());
    JButton memo1Button = new JButton("Save Memo 1");
    memo1Button.addActionListener(this);
    buttonPanel.add(memo1Button);
    JButton memo2Button = new JButton("Save Memo 2");
    memo2Button.addActionListener(this);
    buttonPanel.add(memo2Button);
    JButton clearButton = new JButton("Clear");
    clearButton.addActionListener(this);
    buttonPanel.add(clearButton);
    JButton get1Button = new JButton("Get Memo 1");
    get1Button.addActionListener(this);
    buttonPanel.add(get1Button);
    JButton get2Button = new JButton("Get Memo 2");
    get2Button.addActionListener(this);
    buttonPanel.add(get2Button);
    add(buttonPanel, BorderLayout.SOUTH);
    JPanel textPanel = new JPanel();
    textPanel.setBackground(Color.BLUE);

    memoDisplay = new JTextArea(LINES, CHAR_PER_LINE);
    memoDisplay.setBackground(Color.WHITE);
    JScrollPane scrolledText = new JScrollPane(memoDisplay);
    scrolledText.setHorizontalScrollBarPolicy(
    JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
    scrolledText.setVerticalScrollBarPolicy(
    JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    textPanel.add(scrolledText);
    add(textPanel, BorderLayout.CENTER);
  }
  
  public void actionPerformed(ActionEvent e) {
    String actionCommand = e.getActionCommand();
    if (actionCommand.equals("Save Memo 1"))
      memo1 = memoDisplay.getText();
    else if (actionCommand.equals("Save Memo 2"))
      memo2 = memoDisplay.getText();
    else if (actionCommand.equals("Clear"))
      memoDisplay.setText("");
    else if (actionCommand.equals("Get Memo 1"))
      memoDisplay.setText(memo1);
    else if (actionCommand.equals("Get Memo 2"))
      memoDisplay.setText(memo2);
    else
      memoDisplay.setText("Error in memo interface");
  }
  
}