java常用工具类集合（也有转自他人的）

/** * 设置新闻置顶,如果该新闻占用了其它新闻的置顶位,则将其它新闻置顶位顺位后移 <br> * 如果是取消置顶,则把其它位置的新闻顺位前移 * * @param publishNews * @param topPublishNewsList * @author liangda * @create 2010-10-15 下午03:01:21 */ private void sortTopList(PublishNews publishNews, List<PublishNews> topPublishNewsList) { boolean isPublishNewsTop = false; for (PublishNews pn : topPublishNewsList) { if (pn.getId() == publishNews.getId()) { isPublishNewsTop = true; break; } } // 如果之前是置顶的,缓存它旧的置顶位 int oldPublishNewsIndex = 0; if (isPublishNewsTop) oldPublishNewsIndex = ((PublishNews) getPublishNewsDao().getEntryObject(publishNews.getId())).getListIndex(); boolean overMaxIndex = false; // 如果设置的排位大于数据库里的最大排位,强制处理为最大排位加1 if (publishNews.isTopFlag() && publishNews.getListIndex() > topPublishNewsList.size()) { int maxIndex = topPublishNewsList.size() + 1; publishNews.setListIndex(maxIndex); overMaxIndex = true; } int index = publishNews.getListIndex(); if (!overMaxIndex && (publishNews.isTopFlag() && isPublishNewsTop)) { // 如果之前已经是置顶,现在还是置顶,并且没超出最大排位,则代表换位操作 for (PublishNews pn : topPublishNewsList) { if (oldPublishNewsIndex < index) { if (pn.getListIndex() <= oldPublishNewsIndex || index < pn.getListIndex()) continue; pn.setListIndex(pn.getListIndex() - 1); // 如果之前的位置比现在的位置小,其它的就顺位前移 } else if (oldPublishNewsIndex > index) { if (pn.getListIndex() < index || oldPublishNewsIndex <= pn.getListIndex()) continue; pn.setListIndex(pn.getListIndex() + 1); // 如果之前的位置比现在的位置大,其它的就顺位后移 } getPublishNewsDao().update(pn); } } else if (overMaxIndex && (publishNews.isTopFlag() && isPublishNewsTop)) { // 如果之前已经是置顶,现在还是置顶,并且超出最大排位,则代表置为末位 for (PublishNews pn : topPublishNewsList) { int pnIndex = pn.getListIndex(); if (oldPublishNewsIndex >= pnIndex || publishNews.getId() == pn.getId()) continue; pn.setListIndex(pn.getListIndex() - 1); getPublishNewsDao().update(pn); } // 把新闻的置顶位设置为最大排位 publishNews.setListIndex(topPublishNewsList.size()); } else if (publishNews.isTopFlag() && !isPublishNewsTop) { // 如果以前不是置顶,现在是置顶,代表是新添加置顶,其它的就顺位后移 for (PublishNews pn : topPublishNewsList) { if (index > pn.getListIndex()) continue; pn.setListIndex(pn.getListIndex() + 1); getPublishNewsDao().update(pn); } } else if (!publishNews.isTopFlag() && isPublishNewsTop) { // 如果该新闻之前是设置着置顶的,现在不是置顶的,代表取消置顶,把其它顺位前移 for (PublishNews pn : topPublishNewsList) { if (oldPublishNewsIndex > pn.getListIndex() || publishNews.getId() == pn.getId()) continue; pn.setListIndex(pn.getListIndex() - 1); getPublishNewsDao().update(pn); } } }