Checking string content returns unexpected results

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If “boo” is located at the end of the word, word.substring(word.indexOf("b"),word.indexOf("b")+4) will give you StringIndexOutOfBoundsException, since word.indexOf("b")+2 is the last index of the String, and substring tries to return the characters whose indices are from word.indexOf("b") to word.indexOf("b")+3.

You must check that word.indexOf("b")+4 <= word.length().

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