Java Interview Guide : 200+ Interview Questions and Answers - MultiThreading - Need for Threads and Creating Threads

The video tutorial covers the need for threads in Java, explaining how they enable parallel processing similar to an operating system. It discusses creating threads using the Thread class and Runnable interface, and how to run them. An example of a cricket statistics application illustrates the benefits of multithreading. The tutorial also revisits generics, recommending practice with examples to understand them better.

Why are threads necessary in Java applications?

• To execute multiple tasks sequentially

• To execute multiple tasks in parallel

• To simplify the code structure

• To reduce the memory usage of applications

In the cricket statistics application example, what is the main advantage of using threads?

• It reduces the total execution time by running tasks in parallel

• It simplifies the code by using fewer lines

• It increases the accuracy of the statistics

• It allows for real-time data updates

What is one way to create a thread in Java?

• By extending the Thread class

• By implementing the Threadable interface

• By using the ThreadPool class

• By using the ThreadManager class

Which method must be defined when implementing the Runnable interface?

• start

• execute

• init

• run

How do you start a thread that extends the Thread class?

• By calling the run method

• By calling the start method

• By calling the execute method

• By calling the begin method

What additional step is required when starting a thread that implements the Runnable interface?

• Create an instance of the Runnable class and pass it to a new Thread

• Directly call the run method

• No additional step is required

• Use the ThreadManager to start the thread

What is the key difference in running a thread created by extending the Thread class versus implementing the Runnable interface?

• Threads created by implementing the Runnable interface require an additional Thread instance

• Threads created by extending the Thread class do not need to be started

• Threads created by extending the Thread class run automatically

• Threads created by implementing the Runnable interface cannot be run in parallel