多语言网站建设,视频拍摄教学,北京seo,怎样建网站最快1. 数组转集合
//数组转集合
String[] split quickRechargeAmount.split(,);
ListString stringList Stream.of(split).collect(Collectors.toList()); 2. 对List集合数据内容进行分组
//对List集合数据内容进行分组
MapString, ListLiveAppGi…1. 数组转集合
//数组转集合
String[] split quickRechargeAmount.split(,);
ListString stringList Stream.of(split).collect(Collectors.toList()); 2. 对List集合数据内容进行分组
//对List集合数据内容进行分组
MapString, ListLiveAppGiftResponse collectList giftResponseList.stream().collect(Collectors.groupingBy(LiveAppGiftResponse::getGiftTypeName)); 3. 匹配两个集合内相等的元素生成新的集合
//匹配两个集合内相等的元素生成新的集合
private ListAppLiveUserRankResponse getUserRankInfo(ListLiveUserRankCache dayRankCacheList, Integer anchorId) {ListAppLiveUserInfoResponse userRewardList appLiveRewardMapper.getUserRewardList(CommonContext.get().getSiteId(), anchorId);if (CollectionTool.isNotEmpty(dayRankCacheList) CollectionTool.isNotEmpty(userRewardList)) {//组装用户与排行榜信息ListAppLiveUserRankResponse userRankList dayRankCacheList.stream().map(dayRankCache - userRewardList.stream().filter(userReward - Objects.equals(userReward.getUserId(), dayRankCache.getUserId())).findFirst().map(m - {AppLiveUserRankResponse appLiveUserRank new AppLiveUserRankResponse();appLiveUserRank.setRank(dayRankCache.getRank());appLiveUserRank.setScore(dayRankCache.getScore());appLiveUserRank.setAvatarUrl(m.getAvatarUrl());appLiveUserRank.setNickName(m.getNickName());return appLiveUserRank;}).orElse(null)).filter(Objects::nonNull).collect(Collectors.toList());return userRankList;}return null;
} 4. 根据A集合某元素去对比B集合某元素生成过滤后的B集合
//根据A集合某元素去对比B集合某元素生成过滤后的B集合
public ListUser selectUnassignedGameList(ListUser userBList) {// 查询所有用户信息ListUser userAList this.list();// 获取userBList的中所有用户信息并对比后排除userAList已存在用户信息ListUser list userBList.stream().filter(b - !userAList.stream().map(a- a.getUId()).collect(Collectors.toList()).contains(b.getUId())).collect(Collectors.toList());return list;} 5. 集合内某一元素比对特定条件进行排序 //查询当前账户币种信息集合ListLiveCustomerWallet customerWalletList customerWalletMapper.search(Criteria.add(LiveCustomerWallet.PROP_CUSTOMER_ID, Operator.EQ, model.getUserId()), Order.asc(LiveCustomerWallet.PROP_CURRENCY));if (CollectionTool.isNotEmpty(customerWalletList)){//先按指定币种排序然后再主货币排序再按币种排序String mainCurrency BaseCacheTool.getSysSite(model.getSiteId()).getMainCurrency();if (!mainCurrency.equals(model.getCurrency())){customerWalletList.sort((o1, o2) - {int i o1.getCurrency().equals(mainCurrency) ? 0 : 1;int i2 o2.getCurrency().equals(mainCurrency) ? 0 : 1;return i - i2;});}customerWalletList.sort((o1, o2) - {int i o1.getCurrency().equals(model.getCurrency()) ? 0 : 1;int i2 o2.getCurrency().equals(model.getCurrency()) ? 0 : 1;return i - i2;});} 6. 集合去重
//使用java steam进行去重
ListInteger list numbersList.stream().distinct().collect(Collectors.toList());//将重复的列表添加到 LinkedHashSet然后将内容返回到列表中
LinkedHashSetInteger hashSet new LinkedHashSet(numbersList); 7. 对集合进行分页并模糊查询
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;public class ListTest {public static void main(String[] args) {ListUser list new ArrayList();list.add(new User(zhangsan, 18));list.add(new User(lisi, 19));list.add(new User(wangwu, 20));list.add(new User(zhaoliu, 21));String searchName h;// 是否全部匹配,还是 局部包含匹配Boolean globalMatch Boolean.FALSE;//获取当前页int pageNumber 1;//一页返回多少条int pageSize 2;ListUser stringList list.stream().filter(l - globalMatch?l.getName().equals(searchName):l.getName().contains(searchName))//根据年龄升序排序.sorted(Comparator.comparing(User::getAge)).collect(Collectors.toList());//一页 返回二条ListUser pageList stringList.stream().skip((pageNumber-1)*pageSize).limit(pageSize).collect(Collectors.toList());System.out.println(返回总条数:stringList.size()当前页为:pageNumber每页显示条数:pageSize);System.out.println(本次返回的数据为:);pageList.forEach(System.out::println);}
}
class User{private String name;private Integer age;public User(String name, Integer age) {this.name name;this.age age;}public String getName() {return name;}public void setName(String name) {this.name name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age age;}Overridepublic String toString() {return User{ name name \ , age age };}
}
