数组中连续重复数据删选且记下所在索引-demo

转载自 https://www.oschina.net/question/943923_2218485 这个问题中的一个回复，感谢大哥

public static void main(String[] args) {
    List<String> list = Arrays.asList("a", "b", "a", "a", "a", "d", "d", "b");
    HashMap<String, Object> map = new HashMap<>(15);
    Iterator<String> it = list.iterator();
    if (!it.hasNext()) {
        System.out.println("集合中没有元素！");
    }
    String s = it.next();
    if (s == null) {
        s = "空字符串";
    }
    int cont = 0;
    int index = 0;
    while (it.hasNext()) {
        String temp = it.next();
        if (temp == null) {
            temp = "空字符串";
        }
        if (s.equals(temp)) {
            cont++;
        } else {
            System.out.println("\"" + s + "\"出现了" + (cont + 1) + "次");
            indexMapBuild(cont, index, s, map);
            s = temp;
            cont = 0;
        }
        index++;
    }
    System.out.println("\"" + s + "\"出现了" + (cont + 1) + "次");
    indexMapBuild(cont, index, s, map);
}

private static void indexMapBuild(int cont, int index, String s, HashMap<String, Object> map) {
    if (cont + 1 >= 2) {
        System.out.println("所在的开始索引：" + (index - cont));
        System.out.println("所在的结束索引：" + index);
        ArrayList<Object> indexList = new ArrayList<>();
        indexList.add(index - cont);
        indexList.add(index);
        map.put(s, indexList);
    }
}