Java Thread Methods
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Questions and Answers

What is the purpose of the join() method in a thread?

  • To start a thread’s execution
  • To join the start of a thread’s execution to the end of another thread’s execution (correct)
  • To pause a thread’s execution
  • To terminate a thread’s execution

    • What is the return type of the currentThread() method?

  • Object
  • Void
  • Thread (correct)
  • Runnable

    • How can you create a custom thread in Java?

  • By creating a new instance of the Thread class
  • By extending the Thread class (correct)
  • By implementing the Thread interface
  • By overriding the start() method

    • What is the method used to start a Java thread?

    <p>start()</p> Signup and view all the answers

    What is the purpose of the Runnable interface in Java?

    <p>To define tasks for threads</p> Signup and view all the answers

    What is the outcome of calling the start() method on a thread?

    <p>The thread starts running immediately</p> Signup and view all the answers

    What is the purpose of the run() method in a Java Thread subclass?

    <p>To define the code to be executed by the thread</p> Signup and view all the answers

    How can you create a Thread in Java?

    <p>By extending the Thread class or implementing the Runnable interface</p> Signup and view all the answers

    What is the only method in the Runnable interface?

    <p>run()</p> Signup and view all the answers

    What will happen after the run() method is executed by the thread?

    <p>The thread will stop executing</p> Signup and view all the answers

    How many ways can you implement the Runnable interface?

    <p>3</p> Signup and view all the answers

    What is the result of calling the start() method on a Thread object?

    <p>The thread will execute the run() method in a separate thread</p> Signup and view all the answers

    What is the primary focus of JSF in creating web pages?

    <p>Creating reusable UI components</p> Signup and view all the answers

    What is the default view handler in JSF 2.0 and later versions?

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

    What is required at the top of any XHTML document used in JSF?

    <p>An XML namespace declaration</p> Signup and view all the answers

    What is the primary role of the FacesServlet in JSF?

    <p>Handling HTTP requests</p> Signup and view all the answers

    What is the main difference between JSP and JSF?

    <p>JSP is a lower-level technology, while JSF is a higher-level technology</p> Signup and view all the answers

    What is the relationship between Facelets and XHTML?

    <p>Facelets uses XHTML for creating web pages</p> Signup and view all the answers

    What happens to the lock when a thread calls the wait() method?

    <p>The lock is released prior to waiting and reacquired prior to returning</p> Signup and view all the answers

    What is the purpose of the notify() method?

    <p>To send a notification to one waiting thread</p> Signup and view all the answers

    What happens when a thread calls the notifyAll() method?

    <p>All waiting threads are woken up and execute simultaneously</p> Signup and view all the answers

    What is the order of execution in the given demo?

    <p>The main thread starts executing first</p> Signup and view all the answers

    What is the difference between notify() and notifyAll() methods?

    <p>notify() wakes up one thread, notifyAll() wakes up all threads</p> Signup and view all the answers

    What happens to the lock when a thread calls the notify() method?

    <p>The lock is not given up until the notifier’s synchronized block has completed</p> Signup and view all the answers

    What is a feature of Swing controls that allows for separation of visual appearance from internal representation?

    <p>Easy Customization</p> Signup and view all the answers

    What is the purpose of the JFrame class in a Java GUI application?

    <p>To create and manage top-level windows</p> Signup and view all the answers

    What is the name of the class used to create a labeled button in Swing?

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

    What can be changed during runtime in a Swing GUI application?

    <p>The visual appearance of controls</p> Signup and view all the answers

    What is the purpose of the JLabel class in Swing?

    <p>To place text in a container</p> Signup and view all the answers

    What is a benefit of using Swing in Java application programming?

    <p>It offers a wide range of advanced GUI controls</p> Signup and view all the answers

    Study Notes

    Java Thread Creation

    • A Java Thread can be created by subclassing the Thread class or by implementing the Runnable interface.
    • A Thread subclass can be created by extending the Thread class and overriding the run() method.
    • An anonymous subclass of Thread can be created using an anonymous class.
    • A Runnable interface can be implemented using a Java class, an anonymous class, or a Java Lambda.

    Thread Methods

    • wait(): makes the thread wait until it gets a notification, releasing the lock prior to waiting and reacquiring the lock prior to returning.
    • notify(): sends a notification to one of the waiting threads, waking it up and allowing it to execute the remaining task.
    • notifyAll(): sends a notification to all the waiting threads, waking them up and allowing them to execute simultaneously.

    Inter-Thread Communication

    • wait(), notify(), and notifyAll() methods are used for inter-thread communication.

    Java Swing

    • Swing is a Java API for creating graphical user interfaces (GUIs).
    • Swing offers advanced controls like Tree, TabbedPane, slider, colorpicker, and table controls.
    • Swing controls can be easily customized, separating visual appearance from internal representation.
    • The look and feel of Swing GUI applications can be changed during runtime, offering flexibility in appearance.

    Swing Components

    • JFrame is a class used to create and manage top-level windows in a Java GUI application.
    • JButton is a class used to create a labeled button.

    Java Swing Example

    • A simple Swing example involves creating a button and adding it to a JFrame object.

    Java Thread Methods

    • join(): joins the start of a thread's execution to the end of another thread's execution, ensuring a thread does not start running until another thread ends.
    • currentThread(): returns a reference to the currently executing thread object.

    Creating Threads in Java

    • Java provides a Thread class that can be extended to create custom threads.
    • Java also provides a Runnable interface to define tasks for threads.

    JSP vs JSF

    • JSP (Java Server Pages) is a technology for generating HTML from Java code.
    • JSF (JavaServer Faces) is a technology for creating reusable UI components.
    • JSF provides a high-level, declarative approach to building web user interfaces.

    Facelets

    • Facelets is an XML-based view technology used in JSF to build User Interfaces in web applications.
    • Facelets uses XHTML for creating web pages.
    • Facelets supports XML namespace declarations to use different tag libraries to add components to a web page.
    • XHTML is a markup language based on HTML that follows the XML syntax.

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    Test your knowledge of Java thread methods, including the join() method and the currentThread() method. Learn how to create threads and understand their execution in Java application programming.

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