중복제거

List<String> as = new ArrayList<String>(); //중복키구분용 리스트
List<Map<String,Object>> asd = new ArrayList<Map<String,Object>>(); // 원본값들어있는리스트
List<Map<String,Object>> asd2 = new ArrayList<Map<String,Object>>(); // 중복제거된값이들어갈리스트
for(Map<String,Object> m : asd) {
	String a = (String)m.get("key3");
	if(!as.contains(a)) {
		as.add(a);
		asd2.add(m);
	}
}

Set<Map<String, String>> set = new HashSet<Map<String, String>>(list);
List<Map<String, String>> list2 = new ArrayList<Map<String, String>>(set);

정렬

//lambda + List.sort
list.sort((o1,o2)->{
	String date1 = o1.get("eventTime");
	String date2 = o2.get("eventTime");
	return date1.compareTo(date2);
)};
// 이름(String) 오름차순
Collections.sort(list, new Comparator<HashMap<String, Object>>() {
	@Override
	public int compare(HashMap<String, Object> o1, HashMap<String, Object> o2) {
		String name1 = (String) o1.get("name");
		String name2 = (String) o2.get("name");
		return name1.compareTo(name2);
	}
});
// 나이(Integer) 내림차순
Collections.sort(list, new Comparator<HashMap<String, Object>>() {
	@Override
	public int compare(HashMap<String, Object> o1, HashMap<String, Object> o2) {
		Integer age1 = (Integer) o1.get("age");
		Integer age2 = (Integer) o2.get("age");
		return age2.compareTo(age1);
	}
});
// 점수(Double) 오름차순
Collections.sort(list, new Comparator<HashMap<String, Object>>() {
	@Override
	public int compare(HashMap<String, Object> o1, HashMap<String, Object> o2) {
		Double score1 = (Double) o1.get("score");
		Double score2 = (Double) o2.get("score");
		return score1.compareTo(score2);
	}
});