Java Events and Handling
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Questions and Answers

What is the primary cause of an event in a graphical user interface?

  • A network request
  • A change in the state of an object (correct)
  • A request to the operating system
  • A bug in the program

    • What is the term for the code executed when an event occurs?

  • Event notifier
  • Event generator
  • Event listener
  • Event handler (correct)

    • What model does Java use to handle events?

  • Notification Event Model
  • Delegation Event Model (correct)
  • Publish-subscribe Event Model
  • Observer Event Model

    • What is the benefit of the Delegation Event Model?

    <p>Seperation of user interface logic from event generation logic</p> Signup and view all the answers

    What is the purpose of registering a listener with a source object?

    <p>To receive event notifications</p> Signup and view all the answers

    What is the first step in event handling?

    <p>The user clicks the button and the event is generated</p> Signup and view all the answers

    What is the main purpose of a Layout Manager in Java?

    <p>To arrange components in a particular manner</p> Signup and view all the answers

    What is the default layout of a frame or window in Java?

    <p>BorderLayout</p> Signup and view all the answers

    How many regions can a component be placed in using BorderLayout?

    <p>5</p> Signup and view all the answers

    Which of the following layout managers is used to arrange components in a line, one after another?

    <p>FlowLayout</p> Signup and view all the answers

    What is the name of the interface implemented by all the classes of layout managers in Java?

    <p>LayoutManager</p> Signup and view all the answers

    How many components can be placed in each region of a BorderLayout?

    <p>1</p> Signup and view all the answers

    In a Java GridLayout, what determines the number of columns in the grid?

    <p>The default value is one column per component in a row</p> Signup and view all the answers

    What is the purpose of the hgap and vgap parameters in GridLayout constructor?

    <p>To set the horizontal and vertical gaps between components</p> Signup and view all the answers

    In a Java CardLayout, how many components are visible at a time?

    <p>Only one component is visible at a time</p> Signup and view all the answers

    What is the purpose of the GridBagLayout class?

    <p>To align components vertically, horizontally or along their baseline</p> Signup and view all the answers

    What is the default horizontal and vertical gap in CardLayout?

    <p>Zero horizontal and vertical gap</p> Signup and view all the answers

    In a GridBagLayout, what is the display area of a component?

    <p>The area occupied by the component in the grid</p> Signup and view all the answers

    What is the purpose of a GridBagConstraints object in a GridBagLayout?

    <p>To manage the size of components in a grid</p> Signup and view all the answers

    How does the GridBagLayout manage the size of components?

    <p>By considering the minimum and preferred sizes of each component</p> Signup and view all the answers

    What is unique about the arrangement of components in a GridBagLayout?

    <p>Components can have different sizes and occupy multiple rows or columns</p> Signup and view all the answers

    What is the purpose of the BoxLayout class?

    <p>To arrange components either vertically or horizontally</p> Signup and view all the answers

    What determines the alignment of components in a BoxLayout?

    <p>The ComponentOrientation property of the container</p> Signup and view all the answers

    What is the purpose of the LINE_AXIS constant in the BoxLayout class?

    <p>To align components similar to the way words are aligned in a line</p> Signup and view all the answers

    In a horizontal orientation, how are components aligned based on the ComponentOrientation property of the container?

    <p>Horizontally, if the container's ComponentOrientation property is from left to right</p> Signup and view all the answers

    What is the purpose of a Container in a SWING GUI?

    <p>To provide a space where a component can be located</p> Signup and view all the answers

    What determines the alignment of components in a BoxLayout?

    <p>The axis specified in the BoxLayout constructor</p> Signup and view all the answers

    In a vertical orientation, how are components rendered?

    <p>From top to bottom, regardless of the container's ComponentOrientation property</p> Signup and view all the answers

    What is the purpose of the PAGE_AXIS alignment in BoxLayout?

    <p>To align components similar to the way text lines are put on a page</p> Signup and view all the answers

    What is the constructor of the BoxLayout class?

    <p>BoxLayout(Container c, int axis)</p> Signup and view all the answers

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