30 Questions
What is the purpose of the join() method in a thread?
To join the start of a thread’s execution to the end of another thread’s execution
What is the return type of the currentThread() method?
Thread
How can you create a custom thread in Java?
By extending the Thread class
What is the method used to start a Java thread?
start()
What is the purpose of the Runnable interface in Java?
To define tasks for threads
What is the outcome of calling the start() method on a thread?
The thread starts running immediately
What is the purpose of the run() method in a Java Thread subclass?
To define the code to be executed by the thread
How can you create a Thread in Java?
By extending the Thread class or implementing the Runnable interface
What is the only method in the Runnable interface?
run()
What will happen after the run() method is executed by the thread?
The thread will stop executing
How many ways can you implement the Runnable interface?
3
What is the result of calling the start() method on a Thread object?
The thread will execute the run() method in a separate thread
What is the primary focus of JSF in creating web pages?
Creating reusable UI components
What is the default view handler in JSF 2.0 and later versions?
Facelets
What is required at the top of any XHTML document used in JSF?
An XML namespace declaration
What is the primary role of the FacesServlet in JSF?
Handling HTTP requests
What is the main difference between JSP and JSF?
JSP is a lower-level technology, while JSF is a higher-level technology
What is the relationship between Facelets and XHTML?
Facelets uses XHTML for creating web pages
What happens to the lock when a thread calls the wait() method?
The lock is released prior to waiting and reacquired prior to returning
What is the purpose of the notify() method?
To send a notification to one waiting thread
What happens when a thread calls the notifyAll() method?
All waiting threads are woken up and execute simultaneously
What is the order of execution in the given demo?
The main thread starts executing first
What is the difference between notify() and notifyAll() methods?
notify() wakes up one thread, notifyAll() wakes up all threads
What happens to the lock when a thread calls the notify() method?
The lock is not given up until the notifier’s synchronized block has completed
What is a feature of Swing controls that allows for separation of visual appearance from internal representation?
Easy Customization
What is the purpose of the JFrame class in a Java GUI application?
To create and manage top-level windows
What is the name of the class used to create a labeled button in Swing?
JButton
What can be changed during runtime in a Swing GUI application?
The visual appearance of controls
What is the purpose of the JLabel class in Swing?
To place text in a container
What is a benefit of using Swing in Java application programming?
It offers a wide range of advanced GUI controls
Study Notes
Java Thread Creation
- A Java Thread can be created by subclassing the
Threadclass or by implementing theRunnableinterface. - A
Threadsubclass can be created by extending theThreadclass and overriding therun()method. - An anonymous subclass of
Threadcan be created using an anonymous class. - A
Runnableinterface 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(), andnotifyAll()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
-
JFrameis a class used to create and manage top-level windows in a Java GUI application. -
JButtonis a class used to create a labeled button.
Java Swing Example
- A simple Swing example involves creating a button and adding it to a
JFrameobject.
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
Threadclass that can be extended to create custom threads. - Java also provides a
Runnableinterface 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.
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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