Java Thread Management Quiz

Main Thread

• Thread.currentThread() returns the currently executing thread
• The default priority for the main thread is 5
• The minimum priority is 1 and the maximum is 10

Thread Priorities

• getPriority() returns the priority of the current thread
• setPriority(int) sets the priority of the current thread
• Threads with higher priority have a better chance of being scheduled for execution over threads with lower priorities

Thread Methods

• getName() returns the name of the current thread
• setName(String) sets the name of the current thread
• start() initiates the execution of a thread, effectively calling the run() method
• interrupt() attempts to interrupt a thread, throwing an InterruptedException
• sleep(long) pauses the current thread for the specified duration, throwing an InterruptedException
• sleep(long, long) pauses the current thread for the specified duration with nanosecond precision, throwing an InterruptedException
• join() waits for the specified thread to complete execution before continuing
• wait() pauses the current thread, releasing the lock on the object and waiting for a notify() or notifyAll() call
• wait(long) pauses the current thread for the specified duration, releasing the lock on the object, waiting for a notify() or notifyAll() call and throwing an InterruptedException
• wait(long, long) pauses the current thread for the specified duration with nanosecond precision , releasing the lock on the object, waiting for a notify() or notifyAll() call and throwing an InterruptedException
• notify() wakes up a single thread waiting on the object's monitor
• notifyAll() wakes up all threads waiting on the object's monitor

Creating Threads

• There are two primary ways to create threads:
  • Extending the Thread class: Create a subclass of Thread and override the run() method with the code you want to execute in the thread.
  • Implementing the Runnable interface: Create a class that implements the Runnable interface. The Runnable interface has a single method: run(). Implement this method with the code you want to execute in the thread.

Thread Execution

• The run() method contains the code you want a thread to execute
• Threads are executed by calling the start() method on a Thread object.
• The start() method internally calls the run() method.

Thread Synchronization

• Use synchronization when you want to ensure that a method or block of code is executed by only one thread at a time.
• This prevents race conditions and ensures thread safety.

Synchronization Methods

• Using the synchronized keyword:
  • Synchronizing entire methods:
    • Declare the method as synchronized. Example: synchronized public void show() { ... }
  • Synchronizing specific blocks of code:
    • Use a synchronized block. Example:

    public void show() {
        synchronized (this) {
            // Code to be executed by only one thread at a time
        }
    }
    

GUI Components

• GUI (Graphical User Interface) components are visual elements that make up an application's user interface.
• Common examples include buttons, text fields, labels, and windows.

Test your knowledge on Java thread management concepts including thread priorities, methods, and execution management. This quiz covers key functionalities such as getting and setting thread names and priorities, as well as thread interruption techniques.