prefixAgain

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Given a string, consider the prefix string made of the first N chars of the string. Does that prefix string appear somewhere else in the string? Assume that the string is not empty and that N is in the range 1..str.length().
prefixAgain("abXYabc", 1) → true
prefixAgain("abXYabc", 2) → true
prefixAgain("abXYabc", 3) → false

public boolean prefixAgain(String str, int n)
{
   String prefix=str.substring(0,n);
   return(str.substring(n).contains(prefix));

}