java 多线程（Multithreading in Java）

最新推荐文章于 2024-11-12 19:47:14 发布

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最新推荐文章于 2024-11-12 19:47:14 发布

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本文链接：https://blog.youkuaiyun.com/qq_26324601/article/details/97887331

本文深入探讨了Java中多线程与多进程的优缺点，详细解释了为何多线程能节省内存和时间，提高程序效率。通过对比过程，揭示了线程间共享内存、轻量化特性和快速上下文切换的优势。

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Multithreading in Java

1.we use multithreading than multiprocessing because threads use a shared memory area.They don't allocate separate memory area so saves memory, and context-switching between the threads takes less time than process.

Advantages of Java Multithreading

1) It doesn't block the user because threads are independent and you can perform multiple operations at the same time.

2) You can perform many operations together, so it saves time.

3) Threads are independent, so it doesn't affect other threads if an exception occurs in a single thread.

1) Process-based Multitasking (Multiprocessing)

Each process has an address in memory. In other words, each process allocates a separate memory area.
A process is heavyweight.
Cost of communication between the process is high.
Switching from one process to another requires some time for saving and loading registers, memory maps, updating lists, etc.

2) Thread-based Multitasking (Multithreading)

Note: At a time one thread is executed only.

After starting a thread, it can never be started again. If you does so, an IllegalThreadStateException is thrown. In such case, thread will run once but for second time, it will throw exception.