Strings in Java: interview exercises
Strings in Java: 6 test-checked interview exercises (Reverse the words, Is it a palindrome?), each beside a worked example, with tests as you go. Free.
- Reverse the words
- Is it a palindrome?
- Character frequencies
- Caesar cipher
- Run-length encoding
- Join a list in prose
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Interview mode hides the example: solve it from memory, without the hint or the solution, and it counts as solved cold. Progress is saved in your browser, and in your account if you sign in.