KITFORMA · EDITORIAL ANSWER
Why does Scanner.nextLine return empty immediately after nextInt?
KitForma editorial guide. Token-oriented reading and line-oriented reading leave the input cursor at different boundaries. The remaining end of the current line may be empty.
Step-by-step answer
Token-oriented reading and line-oriented reading leave the input cursor at different boundaries. The remaining end of the current line may be empty.
For a form made of lines, read the whole line and parse it with Integer.parseInt after applying the input contract. Alternatively, explicitly consume the remainder after nextInt when that remainder is intentionally discarded. Do not add an unconditional extra nextLine in every branch; it can skip genuine input when control flow changes.
Test the number and label on separate lines, on one line, and with an invalid number. Decide whether retry should preserve or discard the rest of a bad line. Closing a Scanner over System.in also closes that underlying stream, so consider who owns it.
Sources and verification
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