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Important Web Design and Development Short Questions

Chapter: 23
Question 1:
What is the difference between sequential execution and multithreading?
Answer: Sequential execution processes instructions one at a time, where each instruction must complete before the next one begins. Multithreading allows multiple threads to run simultaneously, which can interleave their execution and achieve concurrency, making the program more efficient in handling multiple tasks.
Chapter: 23
Question 2:
How can you create a thread in Java using the Runnable interface?
Answer: To create a thread using the Runnable interface: 1) Implement the Runnable interface and provide an implementation for the run() method. 2) Instantiate a Thread object with the Runnable object. 3) Start the thread by calling start() on the Thread instance. This allows the run() method to be executed in a separate thread.
Chapter: 23
Question 3:
How do you create a thread in Java using inheritance from the Thread class?
Answer: To create a thread by inheriting from the Thread class: 1) Extend the Thread class and override the run() method with the thread’s task. 2) Instantiate the subclass of Thread. 3) Start the thread by calling start() on the instance. This method directly runs the run() method in a new thread of execution.
Chapter: 23
Question 4:
What is the role of the run() method in multithreading?
Answer: The run() method contains the code that is executed by a thread. When a thread is started, it invokes the run() method, which defines the task or behavior that the thread should perform. This method must be overridden in the Runnable interface implementation or in a subclass of Thread.
Chapter: 23
Question 5:
How does thread priority affect thread execution in Java?
Answer: Thread priority affects the order in which threads are scheduled for execution. Threads with higher priority are given preference over those with lower priority. However, the actual execution depends on the JVM and the underlying OS, which may not always respect thread priorities exactly. Threads can be assigned priorities between 1 and 10.
Chapter: 23
Question 6:
What is the default priority of a thread in Java?
Answer: The default priority of a thread in Java is Thread.NORM_PRIORITY, which is typically set to 5. This priority is assigned to a thread when it is created, and it can be changed using the setPriority(int priority) method.
Chapter: 23
Question 7:
How can you set a thread’s priority in Java?
Answer: You can set a thread's priority using the setPriority(int priority) method, where priority is an integer between Thread.MIN_PRIORITY (1) and Thread.MAX_PRIORITY (10). For example: thread.setPriority(Thread.MAX_PRIORITY);. Setting an appropriate priority can influence the thread's scheduling by the JVM.
Chapter: 23
Question 8:
What is the purpose of the Runnable interface in Java multithreading?
Answer: The Runnable interface is used to define a task that can be executed concurrently by a thread. It provides a single method, run(), that contains the code to be executed by the thread. Implementing this interface allows you to pass the task to a Thread object and manage its execution separately from the main thread.
Chapter: 23
Question 9:
Why is multithreading important for performance in Java applications?
Answer: Multithreading enhances performance by allowing multiple tasks to be performed concurrently. It helps in better utilization of CPU resources, improves application responsiveness, and can lead to faster completion of tasks by parallelizing work. This is especially beneficial in applications that handle multiple operations simultaneously.
Chapter: 24
Question 10:
How does the ReadFile class implement multithreading to read two files?
Answer: The ReadFile class implements the Runnable interface and contains the run() method to read data from a file. By creating two ReadFile objects, each associated with a different file, and passing them to separate Thread objects, you can read from first.txt and second.txt simultaneously by starting both threads.