Yurttas/PL/OOL/Java/F/05/01/05/00/EditPad00.java

 1import javax.swing.*;
 2import java.awt.*;
 3import java.awt.event.*;
 4
 5/**
 6 *  Implements a simple note pad using Swing components.
 7 */
 8
 9public class EditPad00 {
10  public static void main(String args[]) {
11    new EditPad00();
12  }
13
14  String rememberedString;
15  JTextArea textEditArea;
16
17  public EditPad00() {
18    JFrame window = new JFrame("EditPad");
19    Container contentPane = window.getContentPane();
20
21    /* Create a text area, wrap it in a scroll pane
22       and stuff it in the content pane. */
23    textEditArea = new JTextArea();
24    JScrollPane editArea = new JScrollPane(textEditArea);
25    contentPane.add(editArea, BorderLayout.CENTER);
26
27    // Make the application exit when the window is closed by the user.
28    window.addWindowListener(new WindowAdapter() {
29      public void windowClosing(WindowEvent e) {
30        System.exit(0);
31      }
32    });
33
34    // Create actions that the user can activate
35    Action clearOperation = new AbstractAction("Clear") {
36      public void actionPerformed(ActionEvent e) {
37        textEditArea.setText("");
38      }
39    };
40
41    Action rememberOperation = new AbstractAction("Remember") {
42      public void actionPerformed(ActionEvent e) {
43        rememberedString = textEditArea.getText();
44      }
45    };
46
47    Action recallOperation = new AbstractAction("Recall") {
48      public void actionPerformed(ActionEvent e) {
49        if(rememberedString == null) return;
50        textEditArea.setText(rememberedString);
51      }
52    };
53
54    // Create the toolbar and add the actions
55    JToolBar toolbar = new JToolBar();
56    toolbar.add(clearOperation);
57    toolbar.add(rememberOperation);
58    toolbar.add(recallOperation);
59
60    contentPane.add(toolbar, BorderLayout.NORTH);
61
62    // Create the edit menu and add the actions
63    JMenu editMenu = new JMenu("Edit");
64    editMenu.add(clearOperation);
65    editMenu.add(rememberOperation);
66    editMenu.add(recallOperation);
67
68    // Put the menu in the menu bar and attach it to menubar
69    JMenuBar menubar = new JMenuBar();
70    menubar.add(editMenu);
71    window.getRootPane().setJMenuBar(menubar);
72
73    window.pack();
74    window.setVisible(true);
75  }
76
77}