How can I initialise a static Map?

Question

How would you initialise a static Map in Java?

Method one: static initialiser
Method two: instance initialiser (anonymous subclass) or some other m

Answer 1

I would use:

public class Test {
    private static final Map MY_MAP = createMap();

    private static Map createMap() {
        Map result = new HashMap<>();
        result.put(1, "one");
        result.put(2, "two");
        return Collections.unmodifiableMap(result);
    }
}

1. it avoids an anonymous class, which I personally consider to be a bad style, and avoid
2. it makes the creation of map more explicit
3. it makes map unmodifiable
4. as MY_MAP is constant, I would name it like constant