WordAnalyzer.java

package com.nytimes.android.buggyapp;

public class WordAnalyzer {

    public WordAnalyzer() {

    }
    
    public char firstRepeatedCharacter(String word) {
        for (int i = 0; i < word.length(); i++) {
            char ch = word.charAt(i);
            if (ch == word.charAt(i + 1))
                return ch;
        }
        return 0;
    }

    public char firstMultipleCharacter(String word) {
        for (int i = 0; i < word.length(); i++) {
            char ch = word.charAt(i);
            if (find(word, ch, i) >= 0)
                return ch;
        }
        return 0;
    }

    private int find(String word, char c, int pos) {
        for (int i = pos; i < word.length(); i++) {
            if (word.charAt(i) == c) {
                return i;
            }
        }
        return -1;
    }

    public int countRepeatedCharacters(String word) {
        int c = 0;
        for (int i = 1; i < word.length() - 1; i++) {
            if (word.charAt(i) == word.charAt(i + 1)) {
                if (word.charAt(i - 1) != word.charAt(i)) {
                    c++;
                }
            }
        }
        return c;
    }
}