public class MemoSaver extends JFrame implements ActionListener
1:
2: import javax.swing.JButton;
3: import javax.swing.JFrame;
4: import javax.swing.JPanel;
5: import javax.swing.JTextArea;
6: import java.awt.Color;
7: import java.awt.Container;
8: import java.awt.BorderLayout;
9: import java.awt.FlowLayout;
10: import java.awt.event.ActionEvent;
11: import java.awt.event.ActionListener;
12:
13: public class MemoSaver extends JFrame implements ActionListener
14: {
15: public static final int WIDTH = 600;
16: public static final int HEIGHT = 300;
17: public static final int LINES = 10;
18: public static final int CHAR_PER_LINE = 40;
19:
20: private JTextArea theText;
21: private String memo1 = "No Memo 1.";
22: private String memo2 = "No Memo 2.";
23:
24: public MemoSaver( )
25: {
26: setSize(WIDTH, HEIGHT);
27: addWindowListener(new WindowDestroyer( ));
28: setTitle("Memo Saver");
29: Container contentPane = getContentPane( );
30: contentPane.setLayout(new BorderLayout( ));
31:
32: JPanel buttonPanel = new JPanel( );
33: buttonPanel.setBackground(Color.WHITE);
34: buttonPanel.setLayout(new FlowLayout( ));
35:
36: JButton memo1Button = new JButton("Save Memo 1");
37: memo1Button.addActionListener(this);
38: buttonPanel.add(memo1Button);
39:
40: JButton memo2Button = new JButton("Save Memo 2");
41: memo2Button.addActionListener(this);
42: buttonPanel.add(memo2Button);
43:
44: JButton clearButton = new JButton("Clear");
45: clearButton.addActionListener(this);
46: buttonPanel.add(clearButton);
47:
48: JButton get1Button = new JButton("Get Memo 1");
49: get1Button.addActionListener(this);
50: buttonPanel.add(get1Button);
51:
52: JButton get2Button = new JButton("Get Memo 2");
53: get2Button.addActionListener(this);
54: buttonPanel.add(get2Button);
55: contentPane.add(buttonPanel, BorderLayout.SOUTH);
56:
57: JPanel textPanel = new JPanel( );
58: textPanel.setBackground(Color.BLUE);
59:
60: theText = new JTextArea(LINES, CHAR_PER_LINE);
61: theText.setBackground(Color.WHITE);
62: textPanel.add(theText);
63: contentPane.add(textPanel, BorderLayout.CENTER);
64: }
65:
66: public void actionPerformed(ActionEvent e)
67: {
68: String actionCommand = e.getActionCommand( );
69: if (actionCommand.equals("Save Memo 1"))
70: memo1 = theText.getText( );
71: else if (actionCommand.equals("Save Memo 2"))
72: memo2 = theText.getText( );
73: else if (actionCommand.equals("Clear"))
74: theText.setText("");
75: else if (actionCommand.equals("Get Memo 1"))
76: theText.setText(memo1);
77: else if (actionCommand.equals("Get Memo 2"))
78: theText.setText(memo2);
79: else
80: theText.setText("Error in memo interface");
81: }
82:
83: public static void main(String[] args)
84: {
85: MemoSaver guiMemo = new MemoSaver( );
86: guiMemo.setVisible(true);
87: }
88: }