Create Notepad

Notepad

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+/*
+ * To change this template, choose Tools | Templates and open the template in
+ * the editor.
+ */
+package notepad;
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+import java.util.Scanner;
+import java.io.*;
+
+public class Notepad extends JFrame implements ActionListener {
+  private TextArea textArea = new TextArea("", 0,0, TextArea.SCROLLBARS_VERTICAL_ONLY);
+	private MenuBar menuBar = new MenuBar(); // first, create a MenuBar item
+	private Menu file = new Menu(); // our File menu
+	// what's going in File? let's see...
+	private MenuItem openFile = new MenuItem();  // an open option
+	private MenuItem saveFile = new MenuItem(); // a save option
+	private MenuItem close = new MenuItem(); // and a close option!
+
+	public Notepad() {
+		this.setSize(500, 300); // set the initial size of the window
+		this.setTitle("Java Notepad Tutorial"); // set the title of the window
+		setDefaultCloseOperation(EXIT_ON_CLOSE); // set the default close operation (exit when it gets closed)
+		this.textArea.setFont(new Font("Century Gothic", Font.BOLD, 12)); // set a default font for the TextArea
+		// this is why we didn't have to worry about the size of the TextArea!
+		this.getContentPane().setLayout(new BorderLayout()); // the BorderLayout bit makes it fill it automatically
+		this.getContentPane().add(textArea);
+
+		// add our menu bar into the GUI
+		this.setMenuBar(this.menuBar);
+		this.menuBar.add(this.file); // we'll configure this later
+
+		// first off, the design of the menuBar itself. Pretty simple, all we need to do
+		// is add a couple of menus, which will be populated later on
+		this.file.setLabel("File");
+
+		// now it's time to work with the menu. I'm only going to add a basic File menu
+		// but you could add more!
+
+		// now we can start working on the content of the menu~ this gets a little repetitive,
+		// so please bare with me!
+
+		// time for the repetitive stuff. let's add the "Open" option
+		this.openFile.setLabel("Open"); // set the label of the menu item
+		this.openFile.addActionListener(this); // add an action listener (so we know when it's been clicked
+		this.openFile.setShortcut(new MenuShortcut(KeyEvent.VK_O, false)); // set a keyboard shortcut
+		this.file.add(this.openFile); // add it to the "File" menu
+
+		// and the save...
+		this.saveFile.setLabel("Save");
+		this.saveFile.addActionListener(this);
+		this.saveFile.setShortcut(new MenuShortcut(KeyEvent.VK_S, false));
+		this.file.add(this.saveFile);
+
+		// and finally, the close option
+		this.close.setLabel("Close");
+		// along with our "CTRL+F4" shortcut to close the window, we also have
+		// the default closer, as stated at the beginning of this tutorial.
+		// this means that we actually have TWO shortcuts to close:
+		// 1) the default close operation (example, Alt+F4 on Windows)
+		// 2) CTRL+F4, which we are about to define now: (this one will appear in the label)
+		this.close.setShortcut(new MenuShortcut(KeyEvent.VK_F4, false));
+		this.close.addActionListener(this);
+		this.file.add(this.close);
+	}
+
+	public void actionPerformed (ActionEvent e) {
+		// if the source of the event was our "close" option
+		if (e.getSource() == this.close)
+			this.dispose(); // dispose all resources and close the application
+
+		// if the source was the "open" option
+		else if (e.getSource() == this.openFile) {
+			JFileChooser open = new JFileChooser(); // open up a file chooser (a dialog for the user to browse files to open)
+			int option = open.showOpenDialog(this); // get the option that the user selected (approve or cancel)
+			// NOTE: because we are OPENing a file, we call showOpenDialog~
+			// if the user clicked OK, we have "APPROVE_OPTION"
+			// so we want to open the file
+			if (option == JFileChooser.APPROVE_OPTION) {
+				this.textArea.setText(""); // clear the TextArea before applying the file contents
+				try {
+					// create a scanner to read the file (getSelectedFile().getPath() will get the path to the file)
+					Scanner scan = new Scanner(new FileReader(open.getSelectedFile().getPath()));
+					while (scan.hasNext()) // while there's still something to read
+						this.textArea.append(scan.nextLine() + "\n"); // append the line to the TextArea
+				} catch (Exception ex) { // catch any exceptions, and...
+					// ...write to the debug console
+					System.out.println(ex.getMessage());
+				}
+			}
+		}
+
+		// and lastly, if the source of the event was the "save" option
+		else if (e.getSource() == this.saveFile) {
+			JFileChooser save = new JFileChooser(); // again, open a file chooser
+			int option = save.showSaveDialog(this); // similar to the open file, only this time we call
+			// showSaveDialog instead of showOpenDialog
+			// if the user clicked OK (and not cancel)
+			if (option == JFileChooser.APPROVE_OPTION) {
+				try {
+					// create a buffered writer to write to a file
+					BufferedWriter out = new BufferedWriter(new FileWriter(save.getSelectedFile().getPath()));
+					out.write(this.textArea.getText()); // write the contents of the TextArea to the file
+					out.close(); // close the file stream
+				} catch (Exception ex) { // again, catch any exceptions and...
+					// ...write to the debug console
+					System.out.println(ex.getMessage());
+				}
+			}
+		}
+	}
+    // the main method, for actually creating our notepad and setting it to visible.
+    public static void main(String args[]) {
+        Notepad app = new Notepad();
+        app.setVisible(true);
+}
+}