Better Map Constructor

Question

Is there a more streamlined way to do the following?

Map map = new HashMap();
map.put(\"a\", \"apple\");
map.put(         


        

Answer 1

Java 9 adds Map.of, such as:

Map map = Map.of("a", "apple", "b", "bear", "c", "cat");

Up to 10 entries are supported. For more entries you can use the overload taking Entry:

Map map 
    = Map.ofEntries
        (Map.entry("a", "apple")
        , Map.entry("b", "bear")
        , Map.entry("c", "cat"));

Note that these methods do not return a HashMap. It returns an optimized immutable map.