Java Swing Simple Exercise is Completed.

out/production/JavaSwingSimpleExercise/readme-part-1.md

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+## Exercise 1: Click Counter Application
+
+### Description & Goal
+
+Create a simple GUI application that tracks how many times a user clicks a button and displays the count in real time. This exercise reinforces the basics of Swing components and event handling.
+
+### Code Breakdown
+
+**Part 1: Field Declarations**
+Define the UI components and a counter variable.
+
+```java
+public class ClickCounterApp extends JFrame implements ActionListener {
+    private JLabel counterLabel;    // Displays the click count
+    private JButton clickButton;    // Button to register clicks
+    private int count = 0;          // Stores the current count
+}
+```
+
+*Explanation:* We declare a `JLabel` for showing the count, a `JButton` for clicks, and an integer `count` initialized to 0.
+
+**Part 2: Constructor Setup**
+Initialize and arrange components in the window.
+
+```java
+public ClickCounterApp() {
+    setTitle("Click Counter");
+    counterLabel = new JLabel("Clicks: 0", SwingConstants.CENTER);
+    clickButton = new JButton("Click Me");
+    clickButton.addActionListener(this);
+
+    setLayout(new BorderLayout());
+    add(counterLabel, BorderLayout.CENTER);
+    add(clickButton, BorderLayout.SOUTH);
+}
+```
+
+*Explanation:* In the constructor we set the title, create the label and button, attach an `ActionListener` to the button, choose a `BorderLayout`, and place the label at center and button at bottom.
+
+**Part 3: Event Handling**
+Update count and label text when the button is clicked.
+
+```java
+@Override
+public void actionPerformed(ActionEvent e) {
+    count++;  // Increment the click counter
+    counterLabel.setText("Clicks: " + count);
+}
+```
+
+*Explanation:* The `actionPerformed` method is called on each click. We increase `count` by one and refresh the label text to reflect the new value.
+
+**Part 4: Application Entry Point**
+Launch the GUI on the Event Dispatch Thread.
+
+```java
+public static void main(String[] args) {
+    SwingUtilities.invokeLater(() -> new ClickCounterApp().setVisible(true));
+}
+```
+
+*Explanation:* Using `SwingUtilities.invokeLater` ensures thread safety by creating and showing the GUI on the Swing event thread.
+---
+### output of the code:
+
+<img src="./images/img-1-1.png" alt="..." width="400"/>
+<img src="./images/img-1-2.png" alt="..." width="400"/>

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 {
+    private JLabel counterLabel;
+    private JButton clickButton;
+    private int count = 0;
+
+    public E1() {
+        setTitle("Click Counter");
+        setSize(300, 200);
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+        counterLabel = new JLabel("Clicks: 0", SwingConstants.CENTER);
+        clickButton = new JButton("Click Me");
+        clickButton.addActionListener(this);
+
+        setLayout(new BorderLayout());
+        add(counterLabel, BorderLayout.CENTER);
+        add(clickButton, BorderLayout.SOUTH);
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        count++;
+        counterLabel.setText("Clicks: " + count);
+    }
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(() -> {
+            E1 app = new E1();
+            app.setVisible(true);
+        });
+    }
+}

part-2/E2.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+public class E2 extends JFrame implements ActionListener {
+    private JTextField nameField;
+    private JButton greetButton;
+    private JLabel messageLabel;
+
+    public E2() {
+        setTitle("Greeting Form");
+        nameField = new JTextField(15);
+        greetButton = new JButton("Greet");
+        messageLabel = new JLabel("Enter your name and press Greet.", SwingConstants.CENTER);
+
+        greetButton.addActionListener(this);
+
+        JPanel inputPanel = new JPanel();
+        inputPanel.add(new JLabel("Name:"));
+        inputPanel.add(nameField);
+        inputPanel.add(greetButton);
+
+        setLayout(new BorderLayout());
+        add(inputPanel, BorderLayout.NORTH);
+        add(messageLabel, BorderLayout.CENTER);
+
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setSize(400, 200);
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        String name = nameField.getText().trim();
+        if (name.isEmpty()) {
+            messageLabel.setText("Please enter a name.");
+        } else {
+            messageLabel.setText("Hello, " + name + "!");
+        }
+    }
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(() -> new E2().setVisible(true));
+    }
+}

part-3/E3.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+public class E3 extends JFrame implements ActionListener {
+    private JPanel mainPanel;
+    private JButton redButton;
+    private JButton greenButton;
+    private JButton blueButton;
+
+    public E3() {
+        setTitle("Theme Color Selector");
+
+        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);
+
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setSize(400, 200);
+    }
+
+    @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) {
+        SwingUtilities.invokeLater(() -> new E3().setVisible(true));
+    }
+}

part-4/E4.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+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() {
+        setTitle("User  Registration");
+        setSize(500, 350);
+        setDefaultCloseOperation(EXIT_ON_CLOSE);
+        setLocationRelativeTo(null);
+
+        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 bg = new ButtonGroup();
+        bg.add(rbMale);
+        bg.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);
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        String name = txtName.getText();
+        String email = txtEmail.getText();
+        String gender = rbMale.isSelected() ? "Male" : rbFemale.isSelected() ? "Female" : "Unspecified";
+        String interests = "";
+        if (cbJava.isSelected()) interests += "Java ";
+        if (cbPython.isSelected()) interests += "Python ";
+        if (cbCpp.isSelected()) interests += "C++ ";
+
+        JOptionPane.showMessageDialog(this,
+                "Name: " + name + "\n" +
+                        "Email: " + email + "\n" +
+                        "Gender: " + gender + "\n" +
+                        "Interests: " + interests,
+                "Registration Details", JOptionPane.INFORMATION_MESSAGE);
+    }
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(() -> new E4().setVisible(true));
+    }
+}