indexOf : Java Glossary


A method of String for searching for a String within another. Watch your capitalisation: indexOf not index of.

indexOf does a case-sensitive compare. It comes is several versions. The ones that search for single characters are faster than the ones that search for Strings.

For long string searches, consider using the Boyer Moore algorithm, or searching for an obscure character first, then checking the candidate for a full match.


The documentation on indexOf is ambigous. You might think it returns the relative offset, where it actuality it returns
// This code returns 6:
// the index relative to the start of the origingal String,
// not relative to the substring searched starting at offset 2
out.println( "deccccdefgh".indexOf( "de", 2 ) );

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