Given a string s that represents the name of a file, write a code fragment to de

Question

Given a string s that represents the name of a file, write a code fragment to determine its file extension. The file extension is the substring following the last period. For example, the file type of monalisa.jpg is jpg, and the file type of mona.lisa.png is png.

Given a string s that represents the name of a file, write a code fragment to determine its file extension. The file extension is the substring following the last period. For example, the file type of monalisa.jpg is jpg, and the file type of mona.lisa.png is png.

Explanation / Answer

String extension = s.substring(s.lastIndexOf('.') + 1);

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