Interview questions-Java multithreading

Java multithreading

Multithreading basics

1. Talk about the difference between concurrency and parallelism?

   • Concurrency: Refers to two or more events occurring in the same time interval. These events occurred at the same time on a macro level, but alternately occurred on a micro level.
   • Parallel: Two or more events occur at the same time at the same time.

   E.g:

   • Single-core CPU can only execute one program at the same time, and multiple programs can only be executed concurrently
   • Multi-core CPU can execute multiple programs at the same time, and multiple programs can be executed in parallel

2. What are threads and processes?

   • Process is the basic operating unit managed by the operating system
   • A thread is a subtask that runs independently in a process

3. Please briefly describe the relationship between threads and processes?

   There can be multiple threads in a process, and multiple threads share the process's heap and method area resources, but each thread has its own program counter, virtual machine stack, and local method stack.

   and so