Thread safety for static variables

Question

class ABC implements Runnable {
    private static int a;
    private static int b;
    public void run() {
    }
}

I have a Java class as above. I hav

Answer 1

Depends on what needs to be thread-safe. For these int primitives, you'll need either to replace them with AtomicInteger's or only operate with them within synchronized method or block. If you need to make your cross-thread Hashtable thread-safe, you don't need to do anything, as it already is synchronized.