Java去重

1.數組去重：

private static String[] quChong(String[] arr) { ArrayList<String> list  = new ArrayList<String>(); for (String str : arr) { if(!list.contains(str)) list.add(str); } String[] newArr = list.toArray(new String[list.size()]); return newArr; }

2.ArrayList去重：

private static ArrayList<String> quChong(ArrayList<String> list) { ArrayList<String> newList  = new ArrayList<String>(); for (String str : list) { if(!newList.contains(str)) newList.add(str); } return newList; }
 private static ArrayList<String> quChong(ArrayList<String> list){ Set<String> set = new HashSet<String>(arrayList); //若關心元素在ArrayList中的順序，可以用LinkedHashSet
 list.clear(); list.addAll(set); return list; }