Static variable

[rex tony]

Static variable Is Thread Safe?

[Jesper de Jong]

No, static variables are not automatically thread-safe. You'll have to take care of synchronization if you have multiple threads that are accessing a static variable simultaneously.

[camelia codarcea]

Hello,

Static variable should be changed inside static syncronised methods in order to be thread-safe.
Two threads that access a static syncronized method, will always block each other, regardless if they are using the same instance or two different instances.