import?java.awt.*;
import?java.awt.event.*;
import?java.io.*;
import?java.awt.datatransfer.*;
public?class?NotePad01?{
public?static?void?main(String?args[])?{
TextEdit?TE?=?new?TextEdit("記事本");
}
}
class?TextEdit?extends?Frame?implements?ActionListener?{
MenuBar?m;
Menu?m1,?m2;
MenuItem?xinjian,?dakai,?baocun,?tuichu,?jianqie,?fuzhi,?zhantie;
TextArea?text;
String?filename;
FileDialog?openFD,?saveFD;
BufferedReader?in;
FileReader?read;
BufferedWriter?out;
FileWriter?writer;
Clipboard?cb;
TextEdit(String?s)?{
super(s);
m?=?new?MenuBar();
m1?=?new?Menu("File");
xinjian?=?new?MenuItem("New");
dakai?=?new?MenuItem("Open");
baocun?=?new?MenuItem("Save");
tuichu?=?new?MenuItem("Exit");
m2?=?new?Menu("Edit");
jianqie?=?new?MenuItem("Cut");
fuzhi?=?new?MenuItem("Copy");
zhantie?=?new?MenuItem("Paste");
text?=?new?TextArea();
openFD?=?new?FileDialog(this,?"Open",?FileDialog.LOAD);
saveFD?=?new?FileDialog(this,?"Save",?FileDialog.SAVE);
filename?=?"NoName";
m1.add(xinjian);
m1.addSeparator();
m1.add(dakai);
m1.addSeparator();
m1.add(baocun);
m1.addSeparator();
m1.add(tuichu);
m2.add(jianqie);
m2.addSeparator();
m2.add(fuzhi);
m2.addSeparator();
m2.add(zhantie);
m.add(m1);
m.add(m2);
//?關鍵部分，沒有為cb申請內存，下面對cb操作會出錯
cb?=?new?Clipboard("nothing");
//
setMenuBar(m);
setSize(300,?400);
setVisible(true);
add(text,?"Center");
xinjian.addActionListener(this);
dakai.addActionListener(this);
baocun.addActionListener(this);
tuichu.addActionListener(this);
jianqie.addActionListener(this);
fuzhi.addActionListener(this);
zhantie.addActionListener(this);
addWindowListener(new?WindowAdapter()?{
public?void?windowClosing(WindowEvent?e)?{
System.exit(0);
}
});
}
public?void?actionPerformed(ActionEvent?e)?{
if?(e.getSource()?==?xinjian)?{
text.setText("");
}
if?(e.getSource()?==?dakai)?{
openFD.show();
String?s;
filename?=?openFD.getDirectory()?+?openFD.getFile();
if?(filename?!=?null)?{
try?{
File?file?=?new?File(filename);
read?=?new?FileReader(file);
in?=?new?BufferedReader(read);
while?((s?=?in.readLine())?!=?null)
text.append(s?+?'\n');
in.close();
read.close();
}?catch?(IOException?e2)?{
}
}
}
if?(e.getSource()?==?baocun)?{
saveFD.show();
filename?=?saveFD.getDirectory()?+?saveFD.getFile();
if?(filename?!=?null)?{
try?{
File?file?=?new?File(filename);
writer?=?new?FileWriter(file);
out?=?new?BufferedWriter(writer);
out.write(text.getText(),?0,?(text.getText()).length());
out.close();
writer.close();
}?catch?(IOException?e2)?{
}
}
}
if?(e.getSource()?==?tuichu)?{
System.exit(0);
}
if?(e.getSource()?==?jianqie)?{
//?類text中沒有cut方法，不能使用text.cut
String?s?=?text.getSelectedText();
StringSelection?select?=?new?StringSelection(s);
cb.setContents(select,?null);
text.replaceRange("",?text.getSelectionStart(),
text.getSelectionEnd());
}
if?(e.getSource()?==?fuzhi)?{
//?同上，沒有copy這個方法
String?s?=?text.getSelectedText();
StringSelection?select?=?new?StringSelection(s);
cb.setContents(select,?null);
}
if?(e.getSource()?==?zhantie)?{
//?同上，沒有paste方法
String?s?=?"";
Transferable?t?=?cb.getContents(null);
try?{
if?(t?!=?null
&&?t.isDataFlavorSupported(DataFlavor.stringFlavor))?{
//?因為原系的剪貼板裏有多種信息,?如文字,?圖片,?文件等
//?先判斷開始取得的可傳輸的數據是不是文字,?如果是,?取得這些文字
s?=?(String)?t.getTransferData(DataFlavor.stringFlavor);
//?同樣,?因為Transferable中的DataFlavor是多種類型的,
//?所以傳入DataFlavor這個參數,?指定要取得哪種類型的Data.
//?System.out.println(s);
}
}?catch?(UnsupportedFlavorException?ex)?{
ex.printStackTrace();
}?catch?(IOException?ex)?{
ex.printStackTrace();
}
text.insert(s,?text.getCaretPosition());
}
}
}