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xyzThere.java

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/* Return true if the given string contains an appearance of "xyz" where the

* xyz is not directly preceeded by a period (.). So "xxyz" counts but

* "x.xyz" does not.

*/

public boolean xyzThere(String str) {

if(str.length() >= 3 && str.substring(0, 3).equals("xyz"))

return true;

for(int i = 1; i < str.length() - 2; i++) {

if(str.charAt(i - 1) != '.' && str.substring(i, i + 3).equals("xyz"))

return true;

}

return false;

}