JavaSwing

part-1/Main.java

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+import javax.swing.*;
+import java.awt.*;
+
+public class Main {
+    public static void main(String[] args) {
+        JFrame frame = new JFrame("Click Counter");
+        JLabel label = new JLabel("Clicks: 0");
+        label.setHorizontalAlignment(SwingConstants.CENTER);
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.setSize(300, 100);
+        frame.setLayout(new BorderLayout());
+        frame.setResizable(false);
+        JButton button = new JButton("Click Me");
+        frame.add(button, BorderLayout.SOUTH);
+        frame.add(label, BorderLayout.CENTER);
+        frame.setVisible(true);
+        final int[] count = {0};
+        button.addActionListener( e-> {
+            count[0]++;
+            label.setText("clicks: " + count[0]);
+        });
+    }
+}

part-1/out/production/part-1/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-2/Main.java

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+import javax.swing.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class Main {
+    public static void main(String[] args) {
+
+        JFrame frame = new JFrame();
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.setSize(400, 200);
+        frame.setLayout(null);
+
+
+        JLabel label = new JLabel("Enter your name and press greet");
+        label.setBounds(100, 100, 200, 50);
+        frame.add(label);
+
+        JLabel label2 = new JLabel("Name :");
+        label2.setBounds(50, 50, 100, 50);
+        frame.add(label2);
+
+        JTextField textField = new JTextField();
+        textField.setBounds(100, 50, 100, 50);
+        textField.setOpaque(true);
+        frame.add(textField);
+
+        JButton button = new JButton("Greet");
+        button.setBounds(200, 50, 80, 40);
+        frame.add(button);
+        frame.setVisible(true);
+        button.addActionListener(e -> {
+            String name = textField.getText();
+            label.setText("Hello "+name);
+        });
+
+
+    }
+}