builder for HashMap

Question

Guava provides us with great factory methods for Java types, such as Maps.newHashMap().

But are there also builders for java Maps?

HashM         


        

Answer 1

There is no such thing for HashMaps, but you can create an ImmutableMap with a builder:

final Map m = ImmutableMap.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 m = Maps.newHashMap(
    ImmutableMap.builder().
        put("a", 1).
        put("b", 2).
        build());