Java tutorial
//package com.java2s; //License from project: Open Source License import java.util.*; public class Main { @Deprecated public static void filterList(List<Map<String, Object>> list, String key) { List<Object> keys = new ArrayList<>(); for (Map<String, Object> map : list) { Object object = map.get(key); if (!keys.contains(object)) { keys.add(object); } else { list.remove(map); } } } public static Map<Object, Object> get(List<Map<Object, Object>> list, Object key) { for (Map<Object, Object> map : list) { if (map.containsKey(key)) { return map; } } return null; } }