Code RoomExtension crashes on no dot

MediumPrep Room Coding #1684

Extension crashes on no dot

Code reviewDatabases & SQLAlgorithms & data structuresMid–Senior~20 min

Review this Java method that returns the file extension (without the dot), or empty string if none.

What a strong answer looks like

Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix, specific and kind.

0:00 of about 20 min

Mark a line and say what kind of problem it is.0 findings

1String extension(String filename) {

2 int dot = filename.lastIndexOf('.');

3 return filename.substring(dot + 1);

4}

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