static HashMap Vs static block

[kri shan]

I want to cache the data first time from the static block / HashMap, then use it from the cache. Which is the best option static HashMap / static block ?

[Jeff Verdegan]

It's not really clear what you're asking, and "best" never has one simple answer, but one reasonable approach to what I think you're talking about is:

private static final Map<X, Y> map = new HashMap<X, Y>();

static {
  map.put(a, b);
  map.put(c,d);
  ...
}