Pre-Initializing a HashMap with Initializers #airhacks #java #short

Java iInitializers can be used to create an immutable HashMap with initial data.

[mareksiwiec]

It's antypattern. When you initialize hashmap like that after each usage it will create anonymous extra class, in general it first step to memory leak issues.

[lilvulgate]

An other way,
new HashMap<>(Map.of(
"hello", "duke",
"world", "java"));