If you are using Java 10 or later, you can make defensive copies of collections using functions like List.copyOf and Map.copyOf.
They make a copy which is inherently immutable. The beauty is, if the collection you are copying is already immutable, it will usually just return a reference to itself instead of making another (needless) copy.
I've been using the immutable collection classes in Google's Guava library to do the same thing for years.
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If you are using Java 10 or later, you can make defensive copies of collections using functions like
List.copyOfandMap.copyOf.They make a copy which is inherently immutable. The beauty is, if the collection you are copying is already immutable, it will usually just return a reference to itself instead of making another (needless) copy.
I've been using the immutable collection classes in Google's Guava library to do the same thing for years.
docs.oracle.com/javase/10/docs/api...
google.github.io/guava/releases/sn...
Haven’t really played with 10 yet - that sounds really handy!
Love Guava, but I like to see how far I can get without including libraries. Guava is the library that I wish was built in 😍