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/* Given a string, does "xyz" appear in the middle of the string? To define

* middle, we'll say that the number of chars to the left and right of the

* "xyz" must differ by at most one. This problem is harder than it looks.

public boolean xyzMiddle(String str) {

if(str.length() < 3)

return false;

int start1 = str.length() / 2 - 2;

int start2 = str.length() / 2 - 1;

if(str.length() % 2 == 0) {

return str.substring(start1, start1 + 3).equals("xyz") ||

str.substring(start2, start2 + 3).equals("xyz");

}

return str.substring(start2, start2 + 3).equals("xyz");

}