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Fundamentals · medium

34. Optional Class

Avoiding NullPointerExceptions.

1 min read2 questionsup to 50 XPtopic 34/50

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Optional is a container object which may or may not contain a non-null value.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

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Check your understanding

  1. 1. How to create empty optional?

  2. 2. Safely get value or default?

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