在开始之前,首先确保你已经安装了Java 8或更高版本的JDK。 示例代码 AI检测代码解析 importjava.util.ArrayList;importjava.util.Comparator;importjava.util.List;publicclassStudent{privateStringname;privateintscore;publicStudent(Stringname,intscore){this.name=name;this.score=score;}publicStringgetName(){return...
Collections.sort(list, Comparator.comparing(Object::getName)); //倒序 Collections.sort(list, Comparator.comparing(Object::getName).reversed()); //多条件排序 Collections.sort(list, Comparator.comparing(Object::getName).thenComparing(Object::getAge)); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 2...
package TestSort; import java.math.BigDecimal; import java.util.Arrays; import java.util.Comparator; import java.util.List; import java.util.stream.Collectors; public class Sort { public static void main(String[] args) { Listlist = Arrays.asList( new Obj("政府", null), new Obj("政府",...
TheStream.sortedmethod returns a stream consisting of the elements of this stream, sorted according to the providedComparator. For ordered streams, the sort is stable. For unordered streams, no stability guarantees are made. The method does not modify the original list; it returns a new sorted ...
stream.sort耗时:62ms List.sort()耗时:7ms 由此可见list原生排序性能更好。 能证明吗? 证据错了。 再把demo变换一下,先输出stream.sort List<Integer> userList = new ArrayList<>();Random rand = new Random();for (inti =0; i < 10000 ; i++) {userList.add(rand.nextInt(1000));} ...
packagecom.flying.basicKnowledge.stream; importlombok.Data; importorg.junit.BeforeClass; importorg.junit.Test; importjava.time.LocalDate; importjava.util.ArrayList; importjava.util.Comparator; importjava.util.List; importjava.util.stream.Collectors; ...
TheCollections.sort()method works well with lists of objects that implement theComparableinterface, like String, Integer, andDate. It’s a simple, quick way to sort a list in Java. However, it’s not without its limitations. TheCollections.sort()method sorts in ascending order by default, ...
Sorting Custom Objects with Stream.sorted(Comparator<? super T> comparator) In all of the previous examples, we've worked with Comparable types. However, if we're working with some custom objects, which might not be Comparable by design, and would still like to sort them using this method ...
import java.util.stream.Collectors; import java.util.List; import java.util.ArrayList; class HelloWorld { public static void main(String[] args) { AgeRange ageRange = new AgeRange(); ageRange.setBegin(1); ageRange.setEnd(18); Person p1 = new Person(); ...
selectuser_id,user_namefromorderwherepay_time>='2022-11-01'andpay_time<'2022-12-01'orderbygoods_amountdesclimit10; 这种处理逻辑,不用Stream API,实现代码大致如下: publicstaticList<User>getTop10Users()throwsParseException{List<Order>orders=getOrders();// 过滤出双11订单List<Order>filteredOrders=new...