Swing exercises done

part-1/E1.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class E1 extends JFrame implements ActionListener {
+    JButton button;
+    JLabel label;
+    private int clickCount = 0;
+
+    public E1() {
+        button = new JButton("Click Me");
+        button.setPreferredSize(new Dimension(200, 50));
+        label = new JLabel("Clicks: 0", SwingConstants.CENTER);
+
+        button.addActionListener(this);
+
+        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
+        this.setLayout(new BorderLayout());
+        this.setTitle("Click Counter");
+        this.setSize(400, 400);
+        this.getContentPane().setBackground(new Color(255, 182, 193));
+        this.add(button, BorderLayout.SOUTH);
+        this.add(label, BorderLayout.CENTER);
+        this.setVisible(true);
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        if (e.getSource() == button) {
+            clickCount++;
+            label.setText("Clicks: " + clickCount);
+        }
+    }
+    public static void main(String[] args) {
+        new E1();
+    }
+}

part-2/E2.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class E2 extends JFrame implements ActionListener {
+    private JButton button;
+    private JLabel label;
+    private JTextField textField;
+
+    public E2() {
+        button = new JButton("Greet");
+        button.setPreferredSize(new Dimension(100, 20));
+        button.addActionListener(this);
+
+        label = new JLabel("Enter your name and press Greet", SwingConstants.CENTER);
+        textField = new JTextField(20);
+
+        JPanel inputPanel = new JPanel(new FlowLayout(FlowLayout.CENTER, 10, 10));
+        inputPanel.add(new JLabel("Name:"));
+        inputPanel.add(textField);
+        inputPanel.add(button);
+
+        JPanel mainPanel = new JPanel(new BorderLayout(10, 10));
+        mainPanel.add(label, BorderLayout.SOUTH);
+        mainPanel.add(inputPanel, BorderLayout.CENTER);
+
+        this.setTitle("Greeting Form");
+        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        this.setSize(400, 200);
+        this.add(mainPanel);
+        this.setVisible(true);
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        String name = textField.getText().trim();
+        if (name.isEmpty()) {
+            label.setText("Please enter a name.");
+        } else {
+            label.setText("Hello, " + name + "!");
+        }
+    }
+
+    public static void main(String[] args) {
+        new E2();
+    }
+}

part-3/E3.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class E3 extends JFrame implements ActionListener {
+    private JPanel mainPanel;
+    private JButton redButton;
+    private JButton greenButton;
+    private JButton blueButton;
+
+    public E3() {
+
+        mainPanel = new JPanel();
+
+        redButton = new JButton("Red");
+        greenButton = new JButton("Green");
+        blueButton = new JButton("Blue");
+
+        redButton.setActionCommand("RED");
+        greenButton.setActionCommand("GREEN");
+        blueButton.setActionCommand("BLUE");
+
+        redButton.addActionListener(this);
+        greenButton.addActionListener(this);
+        blueButton.addActionListener(this);
+
+        JPanel buttonPanel = new JPanel();
+        buttonPanel.add(redButton);
+        buttonPanel.add(greenButton);
+        buttonPanel.add(blueButton);
+
+        setLayout(new BorderLayout());
+        add(buttonPanel, BorderLayout.NORTH);
+        add(mainPanel, BorderLayout.CENTER);
+
+        this.setTitle("Theme Color Selector");
+        this.setSize(400, 300);
+        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        this.setLocationRelativeTo(null);
+        this.setVisible(true);
+
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        switch (e.getActionCommand()) {
+            case "RED":
+                mainPanel.setBackground(Color.RED);
+                break;
+            case "GREEN":
+                mainPanel.setBackground(Color.GREEN);
+                break;
+            case "BLUE":
+                mainPanel.setBackground(Color.BLUE);
+                break;
+        }
+    }
+    public static void main(String[] args) {
+        new E3();
+    }
+}

part-4/E4.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class E4 extends JFrame implements ActionListener {
+    private JTextField txtName;
+    private JTextField txtEmail;
+    private JPasswordField txtPassword;
+    private JRadioButton rbMale, rbFemale;
+    private JCheckBox cbJava, cbPython, cbCpp;
+    private JButton btnSubmit;
+    private GridBagConstraints gbc;
+
+    public E4() {
+        JPanel panel = new JPanel(new GridBagLayout());
+        gbc = new GridBagConstraints();
+        gbc.insets = new Insets(5, 5, 5, 5);
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+
+        gbc.gridx = 0; gbc.gridy = 0;
+        panel.add(new JLabel("Name:"), gbc);
+        gbc.gridx = 1;
+        txtName = new JTextField(20);
+        panel.add(txtName, gbc);
+
+        gbc.gridx = 0; gbc.gridy = 1;
+        panel.add(new JLabel("Email:"), gbc);
+        gbc.gridx = 1;
+        txtEmail = new JTextField(20);
+        panel.add(txtEmail, gbc);
+
+        gbc.gridx = 0; gbc.gridy = 2;
+        panel.add(new JLabel("Password:"), gbc);
+        gbc.gridx = 1;
+        txtPassword = new JPasswordField(20);
+        panel.add(txtPassword, gbc);
+
+        gbc.gridx = 0; gbc.gridy = 3;
+        panel.add(new JLabel("Gender:"), gbc);
+        gbc.gridx = 1;
+        rbMale = new JRadioButton("Male");
+        rbFemale = new JRadioButton("Female");
+        ButtonGroup genderGroup = new ButtonGroup();
+        genderGroup.add(rbMale);
+        genderGroup.add(rbFemale);
+        JPanel genderPanel = new JPanel();
+        genderPanel.add(rbMale);
+        genderPanel.add(rbFemale);
+        panel.add(genderPanel, gbc);
+
+        gbc.gridx = 0; gbc.gridy = 4;
+        panel.add(new JLabel("Interests:"), gbc);
+        gbc.gridx = 1;
+        cbJava = new JCheckBox("Java");
+        cbPython = new JCheckBox("Python");
+        cbCpp = new JCheckBox("C++");
+        JPanel interestPanel = new JPanel();
+        interestPanel.add(cbJava);
+        interestPanel.add(cbPython);
+        interestPanel.add(cbCpp);
+        panel.add(interestPanel, gbc);
+
+        gbc.gridx = 1; gbc.gridy = 5;
+        gbc.anchor = GridBagConstraints.CENTER;
+        btnSubmit = new JButton("Submit");
+        btnSubmit.addActionListener(this);
+        panel.add(btnSubmit, gbc);
+
+        add(panel);
+
+        this.setTitle("User Registration");
+        this.setSize(500, 350);
+        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
+        this.setLocationRelativeTo(null);
+        this.setVisible(true);
+
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        String name = txtName.getText();
+        String email = txtEmail.getText();
+        String gender = rbMale.isSelected() ? "Male" :
+                rbFemale.isSelected() ? "Female" : "Unspecified";
+        StringBuilder interests = new StringBuilder();
+        if (cbJava.isSelected()) interests.append("Java ");
+        if (cbPython.isSelected()) interests.append("Python ");
+        if (cbCpp.isSelected()) interests.append("C++ ");
+
+        JOptionPane.showMessageDialog(this,
+                "Name: " + name + "\n" +
+                        "Email: " + email + "\n" +
+                        "Gender: " + gender + "\n" +
+                        "Interests: " + interests.toString().trim(),
+                "Registration Details",
+                JOptionPane.INFORMATION_MESSAGE
+        );
+    }
+    public static void main(String[] args) {
+        new E4();
+    }
+}