Last2.java

package Warmup2;

public class Last2 {
	/*
	 * https://codingbat.com/prob/p178318 Given a string, return the count of the
	 * number of times that a substring length 2 appears in the string and also as
	 * the last 2 chars of the string, so "hixxxhi" yields 1 (we won't count the end
	 * substring).
	 * 
	 * last2("hixxhi") → 1 last2("xaxxaxaxx") → 1 last2("axxxaaxx") → 2
	 */

	public int last2(String str) {
		if (str.length() < 2)
			return 0;

		String end = str.substring(str.length() - 2);
		int count = 0;

		for (int i = 0; i < str.length() - 2; i++) {
			String sub = str.substring(i, i + 2);
			if (sub.equals(end)) { // Use .equals() with strings
				count++;
			}
		}

		return count;
	}

}