Introduction:
JavaNote is a simple text-based note-taking application designed to help users create, organize, and manage their notes efficiently. With features like formatting, categorization, and basic search functionality, JavaNote provides a user-friendly interface for maintaining digital notes. This project is an excellent opportunity to practice Java programming and GUI development skills.
Key Features:
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User Authentication: Users can create accounts or log in securely to access their notes.
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Note Creation and Editing: Users can create new notes, edit existing ones, and apply basic formatting (such as bold, italic, and underline) using a user-friendly text editor.
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Categorization: Notes can be categorized into different topics or folders, allowing users to better organize their content.
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Search Functionality: Users can search for specific notes by keywords, titles, or tags.
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User Interface: A graphical user interface (GUI) will be provided for users to interact with the application. The GUI should include buttons, menus, and text areas for creating, editing, and managing notes.
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File Persistence: Notes and user data will be saved locally using file storage. Serialization can be used to save and load notes.
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Formatting Options: Implement a set of buttons or formatting shortcuts that users can use to apply formatting options to selected text in the note editor.
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Responsive Design: Design the application’s GUI to be responsive and user-friendly, ensuring that it works well on different screen sizes.
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Data Validation: Implement input validation to ensure that users enter valid data when creating or editing notes.
Source Code:
Note.java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.ArrayList;
public class NoteAppFrame extends JFrame {
private JTextArea noteTextArea;
private JComboBox<String> categoryComboBox;
private ArrayList<Note> notes;
public NoteAppFrame() {
setTitle("JavaNote - Note Taking Application");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(600, 400);
setLocationRelativeTo(null);
notes = new ArrayList<>();
noteTextArea = new JTextArea();
categoryComboBox = new JComboBox<>();
JButton createButton = new JButton("Create");
JButton editButton = new JButton("Edit");
JButton deleteButton = new JButton("Delete");
JButton saveButton = new JButton("Save");
JPanel controlPanel = new JPanel();
controlPanel.setLayout(new FlowLayout());
controlPanel.add(createButton);
controlPanel.add(editButton);
controlPanel.add(deleteButton);
controlPanel.add(saveButton);
createButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
createNote();
}
});
editButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
editNote();
}
});
deleteButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
deleteNote();
}
});
saveButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
saveNotes();
}
});
add(controlPanel, BorderLayout.NORTH);
add(new JScrollPane(noteTextArea), BorderLayout.CENTER);
loadNotes();
}
private void loadNotes() {
try {
FileInputStream fileIn = new FileInputStream("notes.ser");
ObjectInputStream in = new ObjectInputStream(fileIn);
notes = (ArrayList<Note>) in.readObject();
in.close();
fileIn.close();
populateCategoryComboBox();
} catch (IOException | ClassNotFoundException ex) {
ex.printStackTrace();
}
}
private void saveNotes() {
try {
FileOutputStream fileOut = new FileOutputStream("notes.ser");
ObjectOutputStream out = new ObjectOutputStream(fileOut);
out.writeObject(notes);
out.close();
fileOut.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
private void createNote() {
String title = JOptionPane.showInputDialog(this, "Enter note title:");
String content = noteTextArea.getText();
String category = categoryComboBox.getSelectedItem().toString();
Note note = new Note(title, content, category);
notes.add(note);
populateCategoryComboBox();
saveNotes();
noteTextArea.setText("");
JOptionPane.showMessageDialog(this, "Note created successfully!");
}
private void editNote() {
int selectedNoteIndex = notes.size() > 0 ? categoryComboBox.getSelectedIndex() : -1;
if (selectedNoteIndex >= 0) {
Note selectedNote = notes.get(selectedNoteIndex);
selectedNote.setContent(noteTextArea.getText());
saveNotes();
JOptionPane.showMessageDialog(this, "Note edited successfully!");
} else {
JOptionPane.showMessageDialog(this, "No note selected.");
}
}
private void deleteNote() {
int selectedNoteIndex = notes.size() > 0 ? categoryComboBox.getSelectedIndex() : -1;
if (selectedNoteIndex >= 0) {
notes.remove(selectedNoteIndex);
populateCategoryComboBox();
saveNotes();
noteTextArea.setText("");
JOptionPane.showMessageDialog(this, "Note deleted successfully!");
} else {
JOptionPane.showMessageDialog(this, "No note selected.");
}
}
private void populateCategoryComboBox() {
categoryComboBox.removeAllItems();
for (Note note : notes) {
categoryComboBox.addItem(note.getTitle());
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame frame = new NoteAppFrame();
frame.setVisible(true);
});
}
}
NoteAppFrame.java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.ArrayList;
public class NoteAppFrame extends JFrame {
private JTextArea noteTextArea;
private JComboBox<String> categoryComboBox;
private ArrayList<Note> notes;
public NoteAppFrame() {
setTitle("JavaNote - Note Taking Application");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(600, 400);
setLocationRelativeTo(null);
notes = new ArrayList<>();
noteTextArea = new JTextArea();
categoryComboBox = new JComboBox<>();
JButton createButton = new JButton("Create");
JButton editButton = new JButton("Edit");
JButton deleteButton = new JButton("Delete");
JButton saveButton = new JButton("Save");
JPanel controlPanel = new JPanel();
controlPanel.setLayout(new FlowLayout());
controlPanel.add(createButton);
controlPanel.add(editButton);
controlPanel.add(deleteButton);
controlPanel.add(saveButton);
createButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
createNote();
}
});
editButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
editNote();
}
});
deleteButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
deleteNote();
}
});
saveButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
saveNotes();
}
});
add(controlPanel, BorderLayout.NORTH);
add(new JScrollPane(noteTextArea), BorderLayout.CENTER);
loadNotes();
}
private void loadNotes() {
try {
FileInputStream fileIn = new FileInputStream("notes.ser");
ObjectInputStream in = new ObjectInputStream(fileIn);
notes = (ArrayList<Note>) in.readObject();
in.close();
fileIn.close();
populateCategoryComboBox();
} catch (IOException | ClassNotFoundException ex) {
ex.printStackTrace();
}
}
private void saveNotes() {
try {
FileOutputStream fileOut = new FileOutputStream("notes.ser");
ObjectOutputStream out = new ObjectOutputStream(fileOut);
out.writeObject(notes);
out.close();
fileOut.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
private void createNote() {
String title = JOptionPane.showInputDialog(this, "Enter note title:");
String content = noteTextArea.getText();
String category = categoryComboBox.getSelectedItem().toString();
Note note = new Note(title, content, category);
notes.add(note);
populateCategoryComboBox();
saveNotes();
noteTextArea.setText("");
JOptionPane.showMessageDialog(this, "Note created successfully!");
}
private void editNote() {
int selectedNoteIndex = notes.size() > 0 ? categoryComboBox.getSelectedIndex() : -1;
if (selectedNoteIndex >= 0) {
Note selectedNote = notes.get(selectedNoteIndex);
selectedNote.setContent(noteTextArea.getText());
saveNotes();
JOptionPane.showMessageDialog(this, "Note edited successfully!");
} else {
JOptionPane.showMessageDialog(this, "No note selected.");
}
}
private void deleteNote() {
int selectedNoteIndex = notes.size() > 0 ? categoryComboBox.getSelectedIndex() : -1;
if (selectedNoteIndex >= 0) {
notes.remove(selectedNoteIndex);
populateCategoryComboBox();
saveNotes();
noteTextArea.setText("");
JOptionPane.showMessageDialog(this, "Note deleted successfully!");
} else {
JOptionPane.showMessageDialog(this, "No note selected.");
}
}
private void populateCategoryComboBox() {
categoryComboBox.removeAllItems();
for (Note note : notes) {
categoryComboBox.addItem(note.getTitle());
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame frame = new NoteAppFrame();
frame.setVisible(true);
});
}
}
Output:
