Explain the meaning of volatile identifier in Java?

Question

Java

Gentlemen, I can not understand the meaning of the volatile identifier, please explain in simple words. The following is not clear, if several threads use 1 object and the changed data is often stored in the cache, then wouldn't it be easier to assign the static modifier to the object? Thanks in advance.

Answer 1

wouldn't it be easier to assign the static modifier to the object?

No, it's not easier. A static field belongs to the class itself (the object of the class), not to objects. How will you modify it?
volatile allows you to see changes to a variable in all threads at once, but do not forget that this is only true for atomic operations!
If you are looking for a specific solution to a specific problem - look towards AtomicInteger, AtomicLong, etc. if you need something similar to counters, towards ReentrantLock if you have some kind of shared resource, and towards ConcurrentHashMap if you have a collection that many threads should work with ...