Event-Driven Programming

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Questions and Answers

In event-driven programming, what primarily determines the execution flow of a program?

  • Predefined functions within the operating system.
  • The speed of the processor executing the code.
  • New user events, sensor outputs, or message passing from other programs. (correct)
  • The order in which the code is written.

Which of the following is NOT a typical application of event-driven programming?

  • Programming video games.
  • Developing graphical user interfaces.
  • Batch processing of data files. (correct)
  • Creating server applications.

What role do trigger functions play in event-driven programming?

  • They handle the graphical display of user interfaces.
  • They manage the allocation of system memory for the program.
  • They optimize the program's performance by reducing latency.
  • They determine which code to execute when a specific event occurs. (correct)

Which of the following best describes an 'event source' in event-driven programming?

<p>An object that generates events, such as a button or a text field. (C)</p> Signup and view all the answers

Which statement accurately describes the role of an event listener?

<p>It receives events from an event source and executes the appropriate handling methods. (D)</p> Signup and view all the answers

In Java AWT, what is the primary function of a 'container'?

<p>To hold and organize other components. (A)</p> Signup and view all the answers

Which of the following is a key characteristic of service-oriented event-driven programming?

<p>It focuses on creating programs that run in the backdrop of the OS to create services. (B)</p> Signup and view all the answers

What does 'Event Handling' involve in Java programming?

<p>Responding to events by registering event listeners and implementing event handling methods. (A)</p> Signup and view all the answers

Within the context of Java AWT, what is the purpose of a Layout Manager?

<p>To manage the arrangement of components within a container. (A)</p> Signup and view all the answers

Consider a GUI with a button. What steps are essential for the program to respond when the button is clicked?

<p>Implementing <code>actionPerformed()</code> and registering an event listener for the button are both necessary. (D)</p> Signup and view all the answers

A program uses GridLayout to arrange buttons. What determines the size and position of each button?

<p>The dimensions of the container and the number of rows and columns specified in the <code>GridLayout</code>. (C)</p> Signup and view all the answers

In a Java AWT application, how would you typically set up a button so that it triggers a specific action when clicked?

<p>By attaching an <code>ActionListener</code> to the button and implementing the <code>actionPerformed</code> method. (C)</p> Signup and view all the answers

Given an event-driven program for a simple calculator, what is the role of the 'equals' button click event?

<p>To trigger the calculation of the result based on the entered numbers and operator. (D)</p> Signup and view all the answers

What is the significance of setting res.setEditable(false); on a JTextArea?

<p>It prevents the user from directly typing into the text area. (D)</p> Signup and view all the answers

In event-driven programming, what is the purpose of the line f2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);?

<p>It terminates the application entirely when the close button is clicked. (B)</p> Signup and view all the answers

Flashcards

Event-Driven Programming

A programming paradigm where program execution is determined by user events, sensor outputs, or messages from other programs.

Service-Oriented

This feature creates programs for services without slowing down the computer; services run in the OS backdrop.

Trigger Functions

Functions that determine which code to perform when a specific event occurs, used to select the correct event handler.

Events

An occurrence that triggers a response in a program, such as button clicks, key presses, and mouse movements.

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Event Sources

An object that generates events, like buttons, text fields, or menus in a user interface.

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Event Listeners

An object that receives events from an event source and implements methods to handle those events.

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Component (in Java AWT)

A graphical user interface element, such as a button, text field, or label.

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Container (in Java AWT)

A component that can hold other components, such as frames, panels, and dialog boxes.

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Layout manager

An object that manages the layout of components within a container.

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FlowLayout

Arranges components in a horizontal row.

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GridLayout

Arranges components in a grid of rows and columns.

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BorderLayout

Arranges components in a border layout with five regions: north, south, east, west, and center.

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Event handling

The process of responding to events in a Java program, involving registering an event listener and implementing event handling methods.

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Study Notes

  • Event-driven programming is a paradigm where program execution is directed by user actions, sensor data, or inter-program communication.
  • It's commonly used in graphical interfaces, emphasizing user action responses.

Event-Driven programming applications

  • Event-driven programming is used in game development where objects control the program's flow.
  • It is useful in server apps when spawning service processes is undesirable.
  • It is also used in building user interfaces, particularly graphical ones.

Required Features and characteristics

  • Service-oriented approach is key and efficient, not slowing the computer
  • Trigger functions determine code execution for specific events, selecting event handlers when a specific event occurs.
  • Events, like mouse clicks or keyboard input, prompt user interaction with program objects.
  • Development is aesthetic, straightforward, and simple.

Core concepts

  • Events trigger responses like button clicks, key presses, and mouse movement.
  • Event sources, like buttons, text fields, and menus, generate the events.
  • Event listeners receive events from sources; they implement the methods that handle these events.

Component and Container relationships within Java AWT

  • Component: GUI element like a button, text field, or label.
  • Container: Component that holds other components, such as frames, panels, and dialog boxes.

Common Layout Managers in AWT

  • FlowLayout arranges components horizontally.
  • GridLayout arranges components in rows and columns.
  • BorderLayout arranges components in five regions: north, south, east, west, and center.

Event handling

  • Event handling is the process of response to events in a Java program.
  • Events are handled by registering an event listener to a component to receive those events.
  • Implementation of event handling methods like actionPerformed() caters to event responses, such as button clicks.

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