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  • Multithreading is nothing but the process of executing multiple threads simultaneously.
  • The Thread is fundamentally a lightweight sub-process, which is known as smallest unit of processing. Multiprocessing as well as multithreading are used to achieve multitasking.
  • But we use multithreading than multiprocessing since threads share a common memory area. Here, they do not allocate separate memory area so it saves memory, and then context-switching between the threads takes fewer times than process.
  • Multithreading is generally used in games, animation etc.
 Multithreading in Java

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Advantages of Java Multithreading

  • It doesn't block the user as threads are independent and you can perform multiple operations at same time.
  • In multithreading, we can achieve several operations together so it will save time.
  • The Threads are independent hence it doesn't affect other threads if exception occurs in a single thread.


  • It is a process of executing multiple tasks simultaneously. We use multitasking to utilize the CPU. Multitasking can be achieved by two ways:
    • Process-based Multitasking(Multiprocessing)
    • Thread-based Multitasking(Multithreading)

Process-based Multitasking (Multiprocessing)

  • Each process has its own address in memory i.e. each process allocates separate memory area.
  • Process is heavyweight.
  • Cost of communication between the processes is high.
  • Switching from one process to another require some time for saving and loading registers, memory maps, updating lists etc.

Thread-based Multitasking (Multithreading)

  • Threads share the same address space.
  • Thread is lightweight.
  • Cost of communication between the thread is low.

What is Thread in java ?

  • Thread is a lightweight sub process, a smallest unit of processing. It have a separate path of execution.
  • They are independent, if there occurs any exception in one thread, it doesn't affect other threads. It shares a common memory area.
  • Thread is executed inside the process. There is context-switching between the threads. There can be multiple processes inside the OS and a single process can have multiple threads.

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