Java Programming Lab (IT-306) - Important Questions

Explain the architecture of the Abstract Window Toolkit (AWT). Write a Java AWT program that creates a Frame with the following components: Label, TextField, Button, and a Panel. Arrange components appropriately and demonstrate basic event handling for the Button to read text from the TextField and display it on the Label.

Write a Java program that demonstrates the use of GridLayout and BorderLayout. The program should provide a way to switch between GridLayout and BorderLayout at runtime (for example using a Checkbox or Button). Explain how components are arranged under each layout manager and show the code that performs the layout switching.

Design an AWT program that creates a main Frame containing nested Panels. Use GridLayout to arrange buttons in one Panel and other controls (Label, TextField) in another Panel. Implement event handling so that when a button is clicked, the TextField is updated with the button label.

Explain the difference between heavyweight and lightweight GUI components in Java. Give examples of each and discuss the implications for look-and-feel, painting, and event handling.

Create a simple calculator GUI using AWT. Use BorderLayout for the main Frame and place the display TextField in the North region. Use a Panel with GridLayout for numeric and operator buttons in the Center region. Implement event handling to perform basic arithmetic operations.

Write an AWT program that demonstrates MouseListener and KeyListener. The program should update a Label with the current mouse coordinates when the mouse is moved or clicked, and update another Label when specific keys are pressed. Include code for registering listeners and handling events.

Write a Java AWT program to create a button matrix using GridLayout with dimensions $m \times n$. Each cell should contain a Button labeled by its row and column index. Implement event handling so that clicking any button displays its indices in a Label.

Design an AWT application that demonstrates the use of MenuBar, Menu, and MenuItem. Create at least two menus with multiple MenuItems and implement event handling for menu selections (e.g., File->Exit closes the application).

Describe the following AWT layout managers: FlowLayout, BorderLayout, GridLayout, and CardLayout. For each layout manager, explain how components are arranged and give one use-case scenario where it is appropriate.

Write an AWT program that uses Checkbox, CheckboxGroup, Choice, and List components. Demonstrate how to retrieve the selected values from each component and display them in a TextArea when a Button is clicked.