ArrayList<String> result = new ArrayList<String>(); for(String s: sources){ if(Collections.frequency(reslut, s) < 1) result.add(s); }
LinkedHashSet<String> set = new LinkedHashSet<String>(rules); ArrayList<String> newRules = new ArrayList<String>(set);
针对对象类型:
去除ArrayList<Object>里面的重复记录 http://www.cnblogs.com/jizha/p/java_arraylist_duplicate.html
/** * 将列表中重复的用户移除,重复指的是userid相同 * @param userList * @return */ public ArrayList<UserInfo> removeDuplicteUsers(ArrayList<UserInfo> userList){ Set<UserInfo> s= new TreeSet<UserInfo>(new Comparator<UserInfo>(){ @Override public int compare(UserInfo o1, UserInfo o2) { return o1.userId.compareTo(o2.userId); } }); s.addAll(userList); return new ArrayList<UserInfo>(s); }