JavaInteractiveIntermediate
Java Code Lab
Catch the == string trap and a ConcurrentModificationException, order the compile-and-run steps and complete collection code.
Topics you will practise
- Strings
- Iteration
- How Java runs
- Keywords
- Collections
5 activities. Check each answer to see an explanation.
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How this works
Do, then check
Each activity (find the bug, fill the blanks, put in order, match pairs) is checked when you press Check answer, followed by an explanation.
Fresh order each time
Items are shuffled on every attempt, so retrying tests understanding instead of memory of positions.
Skip and hints
Skip an activity or use a hint when one is available. Skipped activities count as skipped in your results.
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Topics covered
- Strings
- Iteration
- How Java runs
- Keywords
- Collections