importjava.util.Arrays;importjava.util.List;importjava.util.Collections;publicclassMain{publicstaticvoidmain(String[]args){List<String>list=Arrays.asList("apple","orange","banana","grape");// 使用lambda表达式对list进行降序排序Collections.sort(list,(s1,s2)->s2.compareTo(s1));// 输出排序后的l...
为了使用Stream API对List数组排序,我们需要将List转换为Stream,然后进行排序操作,最后将结果转换为List。 代码示例 下面是一个使用Stream API对List数组进行排序的示例代码: importjava.util.ArrayList;importjava.util.Comparator;importjava.util.List;publicclassListSortExample{publicstaticvoidmain(String[]args){// ...
List<User> list = new ArrayList<>(LIST); list.sort((User u1, User u2) -> u1.getAge().compareTo(u2.getAge())); list.forEach(System.out::println); System.out.println(); } 2、Lambda 排序(不带参数类型) Lambda 表达式是可以不用带参数类型的,如下示例: /** * jdk8 lambda 排序,不带...
*String sort(区分大小写) */privatestaticvoidsortStringSentive(){List<String>originalList=Arrays.asList("Apache","apache","aapache","bpache","Bpache","bapache");originalList.sort(Comparator.naturalOrder());System.out.println(originalList); } 2.对数字进行排序 /** *Integer sort() */private...
判断开始时间是否相同,不同的情况下按照开始时间排序,相同的情况下按照结束时间排序。 list=list.stream().sorted((map1,map2)->{ if (map1.get("start_time").equals(map2.get("start_time").toString())) { return map2.get("end_time").toString().compareTo(map1.get("end_time").toString()...
Java8对ListListString》排序 Java 8 对 List<List> 排序 import java.util.ArrayList;import java.util.List;import java.util.stream.Collectors;/** * @author libin * @date 2018/12/14 13:36:34 */ public class Test { public static void main(String[] args) { List<List<String>> stulist = ...
publicstaticvoidmain(String[]args){Personp1=newPerson("麻子",31);Personp2=newPerson("李四",20);Personp3=newPerson("王五",26);List<Person>personList=newArrayList<Person>();personList.add(p1);personList.add(p2);personList.add(p3);//java8遍历personList.forEach(p->System.out.println(p.get...
@GetMapping("/list") publicvoidlist(){ List<InputForm>inputForms=inputFormMapper.selectList(); Map<String,IntSummaryStatistics>collect=inputForms.stream() .collect(Collectors.groupingBy(InputForm::getCreateUserName,Collectors.summarizingInt(InputForm::getStatus))); //对名字去重 Set<String>collect1=inp...
JAVA8List排序,(升序,倒序) List<Integer> integerList = Arrays.asList(4, 5, 2, 3, 7, 9); List<Integer> collect =integerList.stream() .map(i-> i *i).distinct() .collect(Collectors.toList());//Collections.sort(collect);//升序collect.sort(Comparator.reverseOrder());//倒序collect....