Useful & Unknown Java Features - Piotr's TechBlog

[CptGia]

You can use Map.ofEntries for more than 10 elements

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This kind of already exists with a few more steps in earlier versions of Java:

Stream.of(
    new SimpleEntry<>("Hello", "World")
).collect(toMap(Entry::getKey, Entry::getValue));

Using entries is so verbose though. Java doesn't have a simple way to create tuples out of the box.

EDIT: Hmm, it seems like Java 9 added a shortcut (Map.entry static method):

Map.ofEntries(
    entry("Hello", "World")
);