Explore Advanced Java Concepts: Complete Code Examples & Learning Resources

Advanced Java Programs

1. Login Form Using AWT Components

import java.awt.*;
import java.awt.event.*;

public class LoginFormAWT extends Frame implements ActionListener {
    TextField username, password;
    Label l1, l2, msg;
    Button login;

    LoginFormAWT() {
        setTitle("Login Form");
        setSize(300, 200);
        setLayout(new FlowLayout());

        l1 = new Label("Username:");
        l2 = new Label("Password:");
        username = new TextField(20);
        password = new TextField(20);
        password.setEchoChar('*');

        login = new Button("Login");
        login.addActionListener(this);

        add(l1); add(username);
        add(l2); add(password);
        add(login);

        msg = new Label();
        add(msg);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        msg.setText("Logged in as: " + username.getText());
    }

    public static void main(String[] args) {
        new LoginFormAWT();
    }
}
    

2. Form Using List and Choice

import java.awt.*;

public class ListChoiceFormAWT extends Frame {
    List languageList;
    Choice countryChoice;

    ListChoiceFormAWT() {
        setTitle("List and Choice Form");
        setSize(300, 200);
        setLayout(new FlowLayout());

        languageList = new List(3);
        languageList.add("Java");
        languageList.add("C++");
        languageList.add("Python");

        countryChoice = new Choice();
        countryChoice.add("India");
        countryChoice.add("USA");
        countryChoice.add("UK");

        add(new Label("Select Language:"));
        add(languageList);
        add(new Label("Select Country:"));
        add(countryChoice);

        setVisible(true);
    }

    public static void main(String[] args) {
        new ListChoiceFormAWT();
    }
}
    

3. Simple Calculator Using GridLayout

import java.awt.*;
import java.awt.event.*;

public class CalculatorGridLayout extends Frame implements ActionListener {
    TextField display;
    Button[] numButtons;
    Button add, sub, mul, div, eq;
    double num1, num2, result;
    String operator;

    CalculatorGridLayout() {
        setTitle("Simple Calculator");
        setLayout(new GridLayout(4, 4));
        display = new TextField();
        add(display);

        numButtons = new Button[10];
        for (int i = 0; i < 10; i++) {
            numButtons[i] = new Button(String.valueOf(i));
            numButtons[i].addActionListener(this);
            add(numButtons[i]);
        }

        add = new Button("+"); add.addActionListener(this);
        sub = new Button("-"); sub.addActionListener(this);
        mul = new Button("*"); mul.addActionListener(this);
        div = new Button("/"); div.addActionListener(this);
        eq = new Button("="); eq.addActionListener(this);

        add(add); add(sub); add(mul); add(div); add(eq);

        setSize(300, 300);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        String command = e.getActionCommand();
        if (command.charAt(0) >= '0' && command.charAt(0) <= '9') {
            display.setText(display.getText() + command);
        } else if (command.equals("+") || command.equals("-") || command.equals("*") || command.equals("/")) {
            num1 = Double.parseDouble(display.getText());
            operator = command;
            display.setText("");
        } else if (command.equals("=")) {
            num2 = Double.parseDouble(display.getText());
            switch (operator) {
                case "+": result = num1 + num2; break;
                case "-": result = num1 - num2; break;
                case "*": result = num1 * num2; break;
                case "/": result = num1 / num2; break;
            }
            display.setText(String.valueOf(result));
        }
    }

    public static void main(String[] args) {
        new CalculatorGridLayout();
    }
}
    

4. Card Deck Using CardLayout

import java.awt.*;
import java.awt.event.*;

public class CardLayoutExample extends Frame implements ActionListener {
    CardLayout card;
    Button b1, b2, b3;
    Panel cardPanel;

    CardLayoutExample() {
        setTitle("CardLayout Example");
        card = new CardLayout(40, 30);
        cardPanel = new Panel();
        cardPanel.setLayout(card);

        b1 = new Button("Panel 1");
        b2 = new Button("Panel 2");
        b3 = new Button("Panel 3");

        Panel p1 = new Panel();
        p1.add(new Label("This is Panel 1"));
        Panel p2 = new Panel();
        p2.add(new Label("This is Panel 2"));
        Panel p3 = new Panel();
        p3.add(new Label("This is Panel 3"));

        cardPanel.add(p1, "Panel 1");
        cardPanel.add(p2, "Panel 2");
        cardPanel.add(p3, "Panel 3");

        add(cardPanel);
        setLayout(new FlowLayout());

        b1.addActionListener(this);
        b2.addActionListener(this);
        b3.addActionListener(this);

        add(b1);
        add(b2);
        add(b3);

        setSize(400, 400);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        card.next(cardPanel);
    }

    public static void main(String[] args) {
        new CardLayoutExample();
    }
}
    

5. Menu Bar with Submenu (AWT)

5. Menu Bar with Submenu (AWT)

import java.awt.*;
import java.awt.event.*;

public class MenuBarAWTExample extends Frame {
    MenuBar menuBar;
    Menu fileMenu, editMenu, viewMenu;
    MenuItem newItem, openItem, exitItem;

    MenuBarAWTExample() {
        setTitle("Menu Bar Example");
        setSize(400, 300);
        
        menuBar = new MenuBar();

        fileMenu = new Menu("File");
        newItem = new MenuItem("New");
        openItem = new MenuItem("Open");
        exitItem = new MenuItem("Exit");

        fileMenu.add(newItem);
        fileMenu.add(openItem);
        fileMenu.add(exitItem);

        editMenu = new Menu("Edit");
        viewMenu = new Menu("View");

        menuBar.add(fileMenu);
        menuBar.add(editMenu);
        menuBar.add(viewMenu);

        setMenuBar(menuBar);

        setVisible(true);
    }

    public static void main(String[] args) {
        new MenuBarAWTExample();
    }
}

6. Swing Applet with ScrollPane and JComboBox

6. Swing Applet with ScrollPane and JComboBox

import javax.swing.*;
import java.awt.*;

public class ScrollComboBoxApplet extends JApplet {
    public void init() {
        String[] languages = { "English", "Marathi", "Hindi", "Sanskrit" };
        JComboBox comboBox = new JComboBox<>(languages);

        JTextArea textArea = new JTextArea(5, 20);
        JScrollPane scrollPane = new JScrollPane(textArea);

        add(comboBox, BorderLayout.NORTH);
        add(scrollPane, BorderLayout.CENTER);
    }
}

7. JTree Example

7. JTree Example

import javax.swing.*;
import javax.swing.tree.DefaultMutableTreeNode;

public class JTreeExample extends JFrame {
    public JTreeExample() {
        setTitle("JTree Example");

        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
        DefaultMutableTreeNode child1 = new DefaultMutableTreeNode("Child 1");
        DefaultMutableTreeNode child2 = new DefaultMutableTreeNode("Child 2");

        root.add(child1);
        root.add(child2);

        JTree tree = new JTree(root);
        add(new JScrollPane(tree));

        setSize(300, 300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String[] args) {
        new JTreeExample();
    }
}

8. JTable Example

8. JTable Example

import javax.swing.*;
import java.awt.*;

public class JTableExample extends JFrame {
    public JTableExample() {
        setTitle("JTable Example");

        String[][] data = {
            { "1", "John", "25" },
            { "2", "Anna", "30" },
            { "3", "Paul", "28" }
        };

        String[] columnNames = { "ID", "Name", "Age" };

        JTable table = new JTable(data, columnNames);
        add(new JScrollPane(table), BorderLayout.CENTER);

        setSize(400, 300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String[] args) {
        new JTableExample();
    }
}

9. JProgressBar Example

9. JProgressBar Example

import javax.swing.*;

public class JProgressBarExample extends JFrame {
    JProgressBar progressBar;

    JProgressBarExample() {
        setTitle("JProgressBar Example");
        progressBar = new JProgressBar(0, 100);
        progressBar.setValue(0);
        progressBar.setStringPainted(true);

        add(progressBar);

        setSize(400, 100);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);

        fillProgressBar();
    }

    private void fillProgressBar() {
        int i = 0;
        try {
            while (i <= 100) {
                progressBar.setValue(i);
                Thread.sleep(100);
                i += 5;
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        new JProgressBarExample();
    }
}

10. Handling Key Events in Applet

10. Handling Key Events in Applet

import java.awt.*;
import java.awt.event.*;

public class KeyEventApplet extends Applet implements KeyListener {
    String msg = "";

    public void init() {
        addKeyListener(this);
    }

    public void keyPressed(KeyEvent ke) {
        msg = "Key Pressed: " + ke.getKeyChar();
        repaint();
    }

    public void keyReleased(KeyEvent ke) {
        msg = "Key Released: " + ke.getKeyChar();
        repaint();
    }

    public void keyTyped(KeyEvent ke) {
        msg = "Key Typed: " + ke.getKeyChar();
        repaint();
    }

    public void paint(Graphics g) {
        g.drawString(msg, 20, 50);
    }
}

11. Handling Mouse Events with MouseListener

import java.awt.*;
import java.awt.event.*;

public class MouseEventExample extends Frame implements MouseListener {
    String msg = "";

    MouseEventExample() {
        addMouseListener(this);
        setSize(300, 300);
        setVisible(true);
    }

    public void mouseClicked(MouseEvent e) {
        msg = "Mouse Clicked";
        repaint();
    }

    public void mouseEntered(MouseEvent e) {
        msg = "Mouse Entered";
        repaint();
    }

    public void mouseExited(MouseEvent e) {
        msg = "Mouse Exited";
        repaint();
    }

    public void mousePressed(MouseEvent e) {
        msg = "Mouse Pressed";
        repaint();
    }

    public void mouseReleased(MouseEvent e) {
        msg = "Mouse Released";
        repaint();
    }

    public void paint(Graphics g) {
        g.drawString(msg, 50, 50);
    }

    public static void main(String[] args) {
        new MouseEventExample();
    }
}

12. Login Form Using JTextField and JPasswordField (Swing)

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class LoginFormExample extends JFrame implements ActionListener {
    JTextField usernameField;
    JPasswordField passwordField;

    LoginFormExample() {
        setTitle("Login Form");
        setLayout(new GridLayout(3, 2));

        JLabel usernameLabel = new JLabel("Username:");
        JLabel passwordLabel = new JLabel("Password:");

        usernameField = new JTextField();
        passwordField = new JPasswordField();

        JButton loginButton = new JButton("Login");
        loginButton.addActionListener(this);

        add(usernameLabel);
        add(usernameField);
        add(passwordLabel);
        add(passwordField);
        add(loginButton);

        setSize(300, 150);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        String username = usernameField.getText();
        String password = new String(passwordField.getPassword());
        System.out.println("Username: " + username);
        System.out.println("Password: " + password);
    }

    public static void main(String[] args) {
        new LoginFormExample();
    }
}

13. Handling KeyPressed, KeyReleased, KeyTyped in Applet

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

public class KeyEventApplet extends Applet implements KeyListener {
    String msg = "";

    public void init() {
        addKeyListener(this);
        setFocusable(true);
        requestFocus();
    }

    public void keyPressed(KeyEvent e) {
        msg = "Key Pressed: " + e.getKeyChar();
        repaint();
    }

    public void keyReleased(KeyEvent e) {
        msg = "Key Released: " + e.getKeyChar();
        repaint();
    }

    public void keyTyped(KeyEvent e) {
        msg = "Key Typed: " + e.getKeyChar();
        repaint();
    }

    public void paint(Graphics g) {
        g.drawString(msg, 20, 50);
    }
}

14. Handling MouseMotionListener Events

import java.awt.*;
import java.awt.event.*;

public class MouseMotionListenerExample extends Frame implements MouseMotionListener {
    String msg = "";

    MouseMotionListenerExample() {
        addMouseMotionListener(this);
        setSize(400, 300);
        setVisible(true);
    }

    public void mouseDragged(MouseEvent e) {
        msg = "Mouse Dragged at: " + e.getX() + ", " + e.getY();
        repaint();
    }

    public void mouseMoved(MouseEvent e) {
        msg = "Mouse Moved at: " + e.getX() + ", " + e.getY();
        repaint();
    }

    public void paint(Graphics g) {
        g.drawString(msg, 50, 50);
    }

    public static void main(String[] args) {
        new MouseMotionListenerExample();
    }
}

15. Use of WindowAdapter Class

import java.awt.*;
import java.awt.event.*;

public class WindowAdapterExample extends Frame {
    WindowAdapterExample() {
        setTitle("Window Adapter Example");
        setSize(300, 200);
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent we) {
                System.exit(0);
            }
        });
        setVisible(true);
    }

    public static void main(String[] args) {
        new WindowAdapterExample();
    }
}

16. Arithmetic Operations in Applet

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

public class ArithmeticApplet extends Applet implements ActionListener {
    TextField num1, num2, result;
    Button addButton, subButton;

    public void init() {
        num1 = new TextField(5);
        num2 = new TextField(5);
        result = new TextField(5);
        result.setEditable(false);
        
        addButton = new Button("Add");
        subButton = new Button("Subtract");
        
        add(num1);
        add(num2);
        add(addButton);
        add(subButton);
        add(result);
        
        addButton.addActionListener(this);
        subButton.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e) {
        int number1 = Integer.parseInt(num1.getText());
        int number2 = Integer.parseInt(num2.getText());

        if (e.getSource() == addButton) {
            result.setText(String.valueOf(number1 + number2));
        } else if (e.getSource() == subButton) {
            result.setText(String.valueOf(number1 - number2));
        }
    }
}

17. Use of InetAddress Class

import java.net.*;

public class InetAddressExample {
    public static void main(String[] args) {
        try {
            InetAddress ip = InetAddress.getLocalHost();
            System.out.println("Current IP address: " + ip.getHostAddress());
            System.out.println("Host Name: " + ip.getHostName());
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }
}

18. Use of URL and URLConnection

import java.io.*;
import java.net.*;

public class URLConnectionExample {
    public static void main(String[] args) {
        try {
            URL url = new URL("http://www.example.com");
            URLConnection urlConnection = url.openConnection();
            BufferedReader in = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
            String inputLine;

            while ((inputLine = in.readLine()) != null) {
                System.out.println(inputLine);
            }
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

19. Database Interaction with JDBC

import java.sql.*;

public class JDBCExample {
    public static void main(String[] args) {
        try {
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/testdb", "username", "password");
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT * FROM users");

            while (rs.next()) {
                System.out.println("User ID: " + rs.getInt("id"));
                System.out.println("Username: " + rs.getString("username"));
            }
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

20. Servlet Program for Authentication

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class LoginServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        PrintWriter out = response.getWriter();
        response.setContentType("text/html");

        if ("admin".equals(username) && "admin123".equals(password)) {
            out.println("
Login Successful
");
        } else {
            out.println("
Invalid Credentials
");
        }
    }
}