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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.

//

//xyzThere("abcxyz") → true

//xyzThere("abc.xyz") → false

//xyzThere("xyz.abc") → true

public boolean xyzThere(String str) {

if (str.length()<3)

return false;

if (str.substring(0,3).equals("xyz"))

return true;

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

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

return true;

}

return false;

}