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Important Web Design and Development Short Questions

Chapter: 24
Question 1:
What does the sleep(int time) method do in Java multithreading?
Answer: The sleep(int time) method causes the currently executing thread to pause for the specified time in milliseconds. This allows other threads to execute during this pause, improving scheduling and avoiding busy waiting. It can throw InterruptedException, which must be handled using a try-catch block.
Chapter: 24
Question 2:
How can you handle InterruptedException when using sleep() method?
Answer: To handle InterruptedException when using sleep(), you must surround the sleep() method call with a try-catch block. This ensures that any interruption during the sleep period is caught and handled appropriately. Example: try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); }.
Chapter: 24
Question 3:
What is the purpose of the yield() method in Java multithreading?
Answer: The yield() method allows the currently executing thread to temporarily pause and give other threads of the same priority a chance to execute. It is used in cooperative scheduling to help balance thread execution and prevent one thread from monopolizing the CPU. If no other threads are ready, the yielding thread resumes execution.
Chapter: 24
Question 4:
How does the join() method affect thread execution in Java?
Answer: The join() method causes the currently executing thread to wait until the thread on which join() was called has finished executing. This is useful when you need to ensure that one thread completes before another proceeds. It can throw InterruptedException, which should be handled with a try-catch block.
Chapter: 24
Question 5:
What are the main thread states in Java?
Answer: The main thread states in Java are: New (thread is created but not started), Ready (thread is started and waiting to be assigned to a processor), Running (thread is currently executing), and Dead (thread has completed its execution or terminated). These states help in understanding thread lifecycle management.
Chapter: 24
Question 6:
How can you create a thread that sleeps and prints a job title alternately?
Answer: You can create such a thread by implementing the Runnable interface and overriding the run() method. Use Thread.sleep() inside the loop to introduce a delay between prints. This alternates execution between threads by letting one thread sleep while another executes. Example: for(int i=1; i<=10; i++) { Thread.sleep(100); System.out.println(job + " = " + i); }.
Chapter: 24
Question 7:
What is the difference between the main thread and additional threads in a Java program?
Answer: The main thread is created by the JVM when the program starts and executes the main() method. Additional threads are created by instantiating Thread objects or implementing the Runnable interface and can run concurrently with the main thread. The main thread can be used to manage and synchronize other threads.
Chapter: 24
Question 8:
How can you ensure that the main thread waits for other threads to complete?
Answer: Use the join() method on the threads you want to wait for. By calling t1.join() and t2.join() in the main thread, it will block until both t1 and t2 have completed their execution. This ensures that the main thread waits for these threads to finish before proceeding.
Chapter: 24
Question 9:
What happens if a thread with a higher priority is running?
Answer: Threads with higher priority are given preference by the JVM scheduler over those with lower priority. However, this does not guarantee immediate execution if the CPU is busy or other factors affect scheduling. Higher priority threads are more likely to be executed sooner than lower priority ones.
Chapter: 25
Question 10:
What is the main purpose of web applications in organizations?
Answer: Web applications are used by organizations to manage various tasks efficiently. For example, they can handle employee performance management, online course registration, and examination systems, enabling remote access and interaction while streamlining organizational processes.