ywf—java

摘要： 按照ArrayList中指定的某一列进行排序private void sortArrayList(ArrayList nameAndWeight,final int index) {// Collections.sort(nameAndWeight, new Comparator() { @Override public int compare(Object o1, Object o2) { ArrayList list1 = (ArrayList) o1; A... 阅读全文

摘要： 转载：http://blog.csdn.net/gabriel80/article/details/3274747利用HashSet中不包含重复元素的性质。private void filter(ArrayList<String> list) { HashSet hSet = new HashSet(list); list.clear(); list.addAll(hSet); System.out.println(list); } 阅读全文