具体原理和“查找某个字符或字符段在字符串中出现的次数”一样

/**
     * 查找某个字符在字符串中出现的位置信息
     *
     * @param str  待被查找的字符串
     * @param need 待查找的字符
     * @return 位置信息的一个二维数组
     */
    public static int[][] getStrIndex(String str, String need) {
        if (str == null || need == null) {
            return null;
        }
        char strArr[] = str.toCharArray();
        int needLen = need.length();
        int strLen = str.length();
        if (needLen > strLen) {
            return null;
        }
        int count = 0;
        boolean flag = true;
        List<Integer> start = new ArrayList<Integer>();
        for (int i = 0; i < strArr.length; i++) {
            StringBuilder builder = new StringBuilder();
            for (int j = 0; j < needLen; j++) {
                if ((i + j) >= strLen) {
                    flag=false;
                    break;
                }
                builder.append(strArr[i + j]);
            }
            if (!flag) {
                break;
            }
            if (builder.toString().equals(need)) {
                count++;
                start.add(i);
            }
        }
        int[][] index = new int[count][2];
        for (int i = 0; i < start.size(); i++) {
            index[i][0] = start.get(i);
            index[i][1] = start.get(i) + (needLen - 1);
        }
        return index;
    }

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