JAVA TECHNICAL QUESTION & ANSWERS FOR INTERVIEW PART - V ( MULTITHREADING - I )

Technoledge For You
7 Oct 202409:56

Summary

TLDRThis video covers part one of a Java interview topic focused on multithreading. It explains key concepts such as processes and threads, highlighting how multithreading enables processes to run multiple threads concurrently. The video details process-based and thread-based multitasking, thread creation methods, and the lifecycle of a thread in Java. Important methods like `currentThread()`, `getName()`, and `join()` are discussed, alongside thread states such as new, runnable, running, blocked, waiting, and terminated. It concludes with the advantages of multithreading, including improved program performance by utilizing multiple CPUs.

Takeaways

  • 📝 A process is a program under execution, transitioning from source code to its final output.
  • 💻 Multithreading in Java allows a process to create and execute multiple threads concurrently, sharing resources.
  • 🧵 A thread is a lightweight sub-process within a program, using fewer resources than a process, which helps to execute tasks concurrently.
  • ⚡ The main advantage of multithreading in Java is improved performance by utilizing multiple CPUs to speed up execution.
  • 🛠️ Threads in Java can be created either by extending the Thread class or by implementing the Runnable interface.
  • 🏃 The main thread is the default thread that runs when a Java program starts, and it often spawns other child threads.
  • 🔍 The `currentThread()` method retrieves the reference of the currently running thread, while `getName()` fetches the thread's name.
  • ⏳ The `sleep()` method is used to suspend a thread for a specific period, and the `join()` method waits for other threads to finish before terminating.
  • 🛑 The `run()` method serves as the entry point for thread execution, and the `start()` method triggers this execution.
  • 🔄 Java threads go through various states, including New, Runnable, Running, Blocked, Waiting, Timed Waiting, and Terminated, based on their execution lifecycle.

Q & A

  • What is a process in Java?

    -A process in Java is a program that is currently under execution. It starts as a source code, which is interpreted and executed, leading to a process that runs through the CPU.

  • What is multithreading in Java?

    -Multithreading in Java is a programming concept that allows a process to create and execute multiple threads concurrently, sharing the process's resources to increase efficiency and performance.

  • What is multitasking in Java?

    -Multitasking in Java is the ability of a program to perform multiple tasks simultaneously, allowing the execution of various tasks in parallel to improve program efficiency.

  • What is process-based multitasking in Java?

    -Process-based multitasking involves executing multiple independent processes simultaneously, with each process running in parallel and independently of others.

  • What is thread-based multitasking in Java?

    -Thread-based multitasking involves creating and managing lightweight sub-processes, called threads, within a program. These threads run concurrently to complete tasks faster and more efficiently.

  • What is a thread in Java?

    -A thread in Java is a lightweight sub-process that runs independently within a program. Since it uses fewer resources, it is more efficient than a full process.

  • What are the two ways to create a thread in Java?

    -The two ways to create a thread in Java are by extending the `Thread` class or by implementing the `Runnable` interface.

  • What is the main thread in Java, and why is it important?

    -The main thread is the default thread that begins executing when a Java program starts. It is important because other child threads are spawned from it, and it usually performs shutdown operations before the program terminates.

  • What method is used to get the current thread in Java?

    -The `currentThread()` method is used to obtain a reference to the currently running thread in Java.

  • What are the different states of a thread in Java?

    -The different states of a thread in Java are: New (created but not started), Runnable (ready to run), Running (currently executing), Blocked (waiting for resources), Waiting (waiting for other threads to complete), Timed Waiting (waiting for a specified time), and Terminated (finished execution).

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関連タグ
Java MultithreadingThread MethodsMultitaskingProcess ExecutionRunnable InterfaceThread StatesConcurrencyJava ThreadsPerformance OptimizationJava Programming
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