вот тут я накидал основных операций. Тестируйте, если будут недочеты, исправим
| Java |
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| import java.awt.Dimension;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.MenuShortcut;
import java.awt.TextArea;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.filechooser.FileNameExtensionFilter;
public class NotePad extends JFrame implements ActionListener {
private static final long serialVersionUID = 7882570594466471533L;
private TextArea text = new TextArea("", 0, 0, TextArea.SCROLLBARS_VERTICAL_ONLY);
private File file;
// menu bar
private MenuBar menuBar = new MenuBar();
// first menu bar item "File"
private Menu fileMenu = new Menu("File");
// "File" menu items
private MenuItem newFile = new MenuItem("New", new MenuShortcut(KeyEvent.VK_N));
private MenuItem openFile = new MenuItem("Open...", new MenuShortcut(KeyEvent.VK_O));
private MenuItem saveFile = new MenuItem("Save", new MenuShortcut(KeyEvent.VK_S));
private MenuItem saveAsFile = new MenuItem("Save As...", new MenuShortcut(KeyEvent.VK_S, true));
private MenuItem exitFile = new MenuItem("Exit", new MenuShortcut(KeyEvent.VK_F4));
public NotePad() {
super("New File");
add(text);
setMenuBar(menuBar);
newFile.addActionListener(this);
fileMenu.add(newFile);
openFile.addActionListener(this);
fileMenu.add(openFile);
saveFile.addActionListener(this);
fileMenu.add(saveFile);
saveAsFile.addActionListener(this);
fileMenu.add(saveAsFile);
exitFile.addActionListener(this);
fileMenu.add(exitFile);
menuBar.add(fileMenu);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setPreferredSize(new Dimension(600, 400));
pack();
}
@Override
public void actionPerformed(ActionEvent e) {
Object menuItem = e.getSource();
if (menuItem == newFile) {
newFile();
} else if (menuItem == openFile) {
openFile();
} else if (menuItem == saveFile) {
if (file != null) {
saveFile();
} else {
saveAsFile();
}
} else if (menuItem == saveAsFile) {
saveAsFile();
} else if (menuItem == exitFile) {
System.exit(0);
}
}
// creates new file
public void newFile() {
text.setText("");
setTitle("New File");
file = null;
}
// opens existing file
public void openFile() {
JFileChooser fc = new JFileChooser();
if (fc.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
try {
file = fc.getSelectedFile();
BufferedReader in = new BufferedReader(new FileReader(file));
String t = "";
String ls = System.getProperty("line.separator");
while ((t = in.readLine()) != null) {
text.append(t);
text.append(ls);
}
setTitle(file.getName());
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
// saves file
public void saveFile() {
try {
BufferedWriter out = new BufferedWriter(new FileWriter(file));
out.write(text.getText());
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
// saves file with new name
public void saveAsFile() {
JFileChooser fc = new JFileChooser();
if (fc.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
try {
file = fc.getSelectedFile();
BufferedWriter out = new BufferedWriter(new FileWriter(file));
out.write(text.getText());
setTitle(file.getName());
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new NotePad().setVisible(true);
}
});
}
} |
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