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To use JLabel and other Swing components, we first need to import the required libraries. Add the following import statements at the beginning of your Java program: ```java import javax.swing.JFrame; import javax.swing.JLabel; ```

Before creating a JLabel, we need a container, which is typically a JFrame. Create a new JFrame: ```java JFrame frame = new JFrame("JLabel Example"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); ```

Create a new JLabel and set its initial text and size. Then, add it to the JFrame: ```java JLabel label = new JLabel("Hello, World!"); label.setBounds(50, 50, 100, 30); frame.add(label); ```

Set the size of the JFrame and make it visible: ```java frame.setSize(300, 200); frame.setLayout(null); frame.setVisible(true); ```

To change the size of the JLabel after it has been created, use the `setBounds()` method, providing new values for X, Y, width, and height: ```java label.setBounds(50, 50, 200, 30); ``` This line of code will update the width of the JLabel from 100 to 200. Here is the complete Java program to create a JFrame with a JLabel, and then change the size of the JLabel: ```java import javax.swing.JFrame; import javax.swing.JLabel; public class JLabelSizeExample { public static void main(String[] args) { // Create a JFrame JFrame frame = new JFrame("JLabel Example"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Create and add a JLabel to the JFrame JLabel label = new JLabel("Hello, World!"); label.setBounds(50, 50, 100, 30); frame.add(label); // Display the JFrame frame.setSize(300, 200); frame.setLayout(null); frame.setVisible(true); // Change the size of the JLabel label.setBounds(50, 50, 200, 30); } } ```