第1个回答 2010-07-26
最正统的做法是自定义一个比较器,如下所示
public class ArticleComparator implements Comparator {
public int compare(Object o1, Object o2) {
Article c1 = (Article) o1;
Article c2 = (Article) o2;
if (c1.getGxrq().getTime() > c2.getGxrq().getTime()) {
return 1;
}
return -1;
}
}
主代码这样既可
List<Article> list1 = new ArrayList<Article>();
/*.....添加数据.......*/
List<Article> list2 = new ArrayList<Article>();
/*.....添加数据.......*/
list1.addAll(list2);
ArticleComparator articleComparator = new ArticleComparator();
Collections.sort(list1, articleComparator);
第2个回答 2015-09-10
将两个list合并
List<Article> list1 = new ArrayList<Article>();
List<Article> list2 = new ArrayList<Article>();
list1.addAll(list2);
Collections.sort(list,new ReverseSort());
//自定义反向排序比较器
class ReverseSort implements Comparator{
public int compare(Object obj1,Object obj2) {
Article user1 = (Article)obj1;
Article user2 = (Article)obj2;
return -user1.gxrq.compareTo(user2.gxrq);
}
}
第3个回答 2010-07-26
放到一个list中排序就可以了
List<Article> list = new ArrayList<Article>();
list.addAll(list1);
list.addAll(list2);
然后2层循环就可以了
第4个回答 2010-07-26
List<String> list = new ArrayList<String>();
list.add("6");
list.add("5");
list.add("");
list.add("3");
list.add("1");
list.add("2");
list.add("4");
Collections.sort(list);