Multiple Threads calling static helper method

Question

I have a web application running on Tomcat.

There are several calculations that need to be done on multiple places in the web application. Can I make those calculations

Answer 1

If you don't have to share it you can make it thread local, then it doesn't have to be thread safe.

public class Helper {

private static final ThreadLocal obj = new ThreadLocal() {
    public SomeObject initialValue() {
        return enw SomeObject();
    }
}

public static void changeMember() {
    Helper.obj.get().changeValue();
}

public static String readMember() {
    Helper.obj.get().readValue();
}

}