Java

List.of Is Unmodifiable in Java

JavaCollectionsImmutableintermediate

List.of returns an unmodifiable list. Any mutation throws at runtime rather than being caught by the compiler.

expected output

cannot modify
[a, b]

Why practise typing this

Typing collections code builds muscle memory for the symbols and indentation Java uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.

More Java practice

Browse all Java snippets →