There is no such thing for HashMaps, but you can create an ImmutableMap with a builder: final Map<String, Integer> m = ImmutableMap.<String, Integer>builder(). put(“a”, 1). put(“b”, 2). build(); And if you need a mutable map, you can just feed that to the HashMap constructor. final Map<String, Integer> m = Maps.newHashMap( ImmutableMap.<String, Integer>builder(). put(“a”, 1). put(“b”, … Read more
First of, as javamonkey79 explained, while Google Guava and Apache Commons do share similar features, they also both have functionality that is absent from their counterpart. Thus, limiting yourself to only one library might be unwise. That being said, if I had to choose, I’d opt to use Guava, keeping Apache Commons around for the … Read more
(Too big for comment, so I post an answer.) Personally I use whole Guava library in every Java project and when I don’t have significant and properly profiled performance problems. If you do have, for example, memory concerns like in Android environment, you can use ProGuard to get only these parts of Guava you really … Read more
Seriously, everything in Guava is useful. I’ve been using it for quite a while, and am still always discovering something new I can do with it that takes less code than doing it by hand. Some things others have not really mentioned that I love: Multimaps are just great. Any time you would use something … Read more
You are searching for a multimap, and indeed both commons-collections and Guava have several implementations for that. Multimaps allow for multiple keys by maintaining a collection of values per key, i.e. you can put a single object into the map, but you retrieve a collection. If you can use Java 5, I would prefer Guava’s … Read more
With Java 8 it is so simple so it doesn’t even need separate method anymore: List<Integer> range = IntStream.rangeClosed(start, end) .boxed().collect(Collectors.toList()); And in Java 16 or later: List<Integer> range = IntStream.rangeClosed(start, end) .boxed().toList();
From https://docs.oracle.com/javaee/7/api/javax/ws/rs/core/MediaType.html : staticjava.lang.String APPLICATION_ATOM_XML “application/atom+xml” staticMediaType APPLICATION_ATOM_XML_TYPE “application/atom+xml” staticjava.lang.String APPLICATION_FORM_URLENCODED “application/x-www-form-urlencoded” staticMediaType APPLICATION_FORM_URLENCODED_TYPE “application/x-www-form-urlencoded” staticjava.lang.String APPLICATION_JSON “application/json” staticMediaType APPLICATION_JSON_TYPE “application/json” staticjava.lang.String APPLICATION_OCTET_STREAM “application/octet-stream” staticMediaType APPLICATION_OCTET_STREAM_TYPE “application/octet-stream” staticjava.lang.String APPLICATION_SVG_XML “application/svg+xml” staticMediaType APPLICATION_SVG_XML_TYPE “application/svg+xml” staticjava.lang.String APPLICATION_XHTML_XML “application/xhtml+xml” staticMediaType APPLICATION_XHTML_XML_TYPE “application/xhtml+xml” staticjava.lang.String APPLICATION_XML “application/xml” staticMediaType APPLICATION_XML_TYPE “application/xml” staticjava.lang.String MEDIA_TYPE_WILDCARD The value of a type or subtype wildcard: … Read more
Notice that your error message only contains five K, V pairs, 10 arguments total. This is by design; the ImmutableMap class provides six different of() methods, accepting between zero and five key-value pairings. There is not an of(…) overload accepting a varags parameter because K and V can be different types. You want an ImmutableMap.Builder: … Read more
In my opinion the better choice is Guava (formerly known as Google collections): it’s more modern (has generics) it absolutely follows the Collections API requirements it’s actively maintained CacheBuilder and it’s predecessor MapMaker are just plain awesome Apache Commons Collections is a good library as well, but it has long failed to provide a generics-enabled … Read more