Volatile vs Synchronized

[dvas0004]

• Volatile

  • field modifier, eg: volatile int demo = 5;
  • Used since threads can have their own copy of memory, and "volatile" ensures there's only one copy of the variable, so all threads will see the same value

• Synchronized

  • modifies code blocks or methods
  • use locks to ensure only one thread at a time can run the code
  • includes variables, i.e. there is no need for volatile on synchronized variables. (which results in more overhead)