2024年1月23日发(作者：)
实验内容：设计与实现一个文本编辑器，要求具有方便的图形用户界面，包括标题栏、菜单栏，菜单栏有相关的菜单和菜单项，有快捷键，具有编辑、打开、保存、复制、粘贴等功能（详细功能要求通过运行提供的字节码文件来确定，主类是JNotePadUI）。完成有关类的设计，并调试运行，给出有代表性的程序输出结果（程序运行截图）。
程序运行截图如下；
图一
1
图二
图三
2
图四
图五
3
图六
4
图三
程序代码如下：
//
import .*;
import .*;
import ansfer.*;
import .*;
import .*;
import .*;
public class JNotePadUI extends JPanel {
// 变量定义
JTextArea jta = new JTextArea("", 24, 40);
JScrollPane jsp = new JScrollPane(jta);
// 菜单条
JMenuBar jmb = new JMenuBar();
JMenu file = new JMenu("文件(F)", true);
JMenu edit = new JMenu("编辑(E)", true);
JMenu help = new JMenu("帮助(H)", true);
// 工具条
JToolBar toolBar = new JToolBar();
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// 菜单内容
JMenuItem jmi;
// 实例化剪切板
Clipboard clipbd = getToolkit().getSystemClipboard();
String text = "";
// 构造函数
public JNotePadUI() {
class newL implements ActionListener {
public void actionPerformed(ActionEvent e) {
ument(new PlainDocument());
}
}
// 打开功能
class openL implements ActionListener {
public void actionPerformed(ActionEvent e) {
JFileChooser fc = new JFileChooser();
int returnVal = alog(, "打开");
if (returnVal == E_OPTION) {
String file = ectedFile().getPath();
if (file == null) {
return;
}
// 读取文件
try {
Reader in = new FileReader(file);
char[] buff = new char[4096];
int nch;
while ((nch = (buff, 0, )) != -1) {
ument(new PlainDocument());
(new String(buff, 0, nch));
}
} catch (IOException io) {
n("IOException: " + sage());
}
} else {
return;
}
}
}
// 保存文件
class saveL implements ActionListener {
public void actionPerformed(ActionEvent e) {
JFileChooser fc = new JFileChooser();
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int returnVal = veDialog();
if (returnVal == E_OPTION) {
String savefile = ectedFile().getPath();
if (savefile == null) {
return;
} else {
String docToSave = t();
if (docToSave != null) {
FileOutputStream fstrm = null;
BufferedOutputStream ostrm = null;
try {
fstrm = new FileOutputStream(savefile);
ostrm = new BufferedOutputStream(fstrm);
byte[] bytes = null;
try {
bytes = es();
} catch (Exception e1) {
tackTrace();
}
(bytes);
} catch (IOException io) {
n("IOException: "
+ sage());
} finally {
try {
();
();
();
} catch (IOException ioe) {
n("IOException: "
+ sage());
}
}
}
}
} else {
return;
}
}
}
// 退出
class exitL implements ActionListener {
public void actionPerformed(ActionEvent e) {
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(0);
}
}
// 复制
class copyL implements ActionListener {
public void actionPerformed(ActionEvent e) {
String selection = ectedText();
StringSelection clipString = new StringSelection(selection);
tents(clipString, clipString);
}
}
// 剪切
class cutL implements ActionListener {
public void actionPerformed(ActionEvent e) {
String selection = ectedText();
StringSelection clipString = new StringSelection(selection);
tents(clipString, clipString);
eRange("", ectionStart(), jta
.getSelectionEnd());
}
}
// 粘贴
class pasteL implements ActionListener {
public void actionPerformed(ActionEvent e) {
Transferable clipData = tents();
try {
String clipString = (String) clipData
.getTransferData(Flavor);
eRange(clipString, ectionStart(), jta .getSelectionEnd());
} catch (Exception ex) {
}
}
}
// 删除
class deleteL implements ActionListener {
public void actionPerformed(ActionEvent e) {
eRange("", ectionStart(), jta
.getSelectionEnd());
}
}
//帮助
class help_h implements ActionListener{
public void actionPerformed(ActionEvent e){
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ssageDialog(jta,"记事本支持拖入文本读取n" + "由于对编码不熟悉做得n不是很好 n ", "帮助主题", ATION_MESSAGE);
}
}
//关于
class help_a implements ActionListener{
public void actionPerformed(ActionEvent e){
ssageDialog(jta," 的记事本n" + "
mail:bahargul317@" + " JAVA图形界面练习n", "关于记事本",
ATION_MESSAGE);
}
}
// 事件监听
class jtaL implements ActionListener {
public void actionPerformed(ActionEvent e) {
}
}
// 快捷键设置
(jmi = new JMenuItem("新建N", 'N'));
elerator(Stroke(_N,
_MASK));
ionListener(new newL());
(jmi = new JMenuItem("打开O", 'O'));
elerator(Stroke(_O,
_MASK));
ionListener(new openL());
(jmi = new JMenuItem("保存S", 'S'));
elerator(Stroke(_S,
_MASK));
ionListener(new saveL());
arator();
(jmi = new JMenuItem("退出X", 'X'));
elerator(Stroke(_X,
_MASK));
ionListener(new exitL());
(jmi = new JMenuItem("复制C", 'C'));
elerator(Stroke(_C,
_MASK));
ionListener(new copyL());
(jmi = new JMenuItem("剪切T", 'T'));
elerator(Stroke(_T,
_MASK));
ionListener(new cutL());
(jmi = new JMenuItem("粘帖V",'V'));
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elerator(Stroke(_V,
_MASK));
ionListener(new pasteL());
(jmi = new JMenuItem("删除D", 'D'));
elerator(Stroke(_D,
_MASK));
ionListener(new deleteL());
arator();
(jmi = new JMenuItem("帮助(H)", 'H'));
elerator(Stroke(_H,
_MASK));
ionListener(new help_h());
(jmi = new JMenuItem("关于(A)", 'A'));
elerator(Stroke(_A,
_MASK));
ionListener(new help_a());
arator();
setLayout(new BorderLayout());
monic('F');
monic('E');
monic('H');
(file);
(edit);
(help);
atable(true);
add(jmb, );
add(toolBar, );
add(jsp, );
et().setVisible(true);
etPosition(0);
}
// 关闭窗口
protected static final class appCloseL extends WindowAdapter {
public void windowClosing(WindowEvent e) {
(0);
}
}
// 主函数，程序入口
public static void main(String args[]) {
JFrame f = new JFrame();
JNotePadUI applet = new JNotePadUI();
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le("写字板 巴哈尔古力。库来西");
kground(ray);
tentPane().add(applet, );
dowListener(new appCloseL());
e(800, 500);
ible(true);
();
}
}
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