Can volatile variable be defined as static in java?

Question

Can I declare something like this??

static volatile boolean first=false;

Answer 1

yes, you can.

static boolean first=false;

When you are declaring a static variable, there will be only one copy for all the objects, no matter how many objects of the class are created. Each thread would have its own cached copy.

If it is volatile, Thread should go to memory each time and gets the updated value of the variable.

static volatile boolean first=false;

It will

force the thread to read each time the memory directly

to find the value of the variable first.