Arrays.stream(ints); 1. 2. 3. 4. 5. 6. 7. 8. 使用Stream流(常用API) 首先创建一个Student类测试 public class Student { private String name; public Student(String name) { this.name = name; } public String getName() { return name; } public void setName(String name) { this.name ...
Stream<String> stream = Stream.of("work","word","sister","word") .distinct(); 1. 2. 对于流的排序,有多种sorted方法变体可用。其中一种利用操做Comparable元素的流,而另一种可以接受一个Comparator。下面是对一个字符串进行排序,是最长的字符串排到最前面: List<String> word = new ArrayList<>();...
Stream<String> stream = Stream.of("apple", "banana", "cherry"); Stream<String> sortedStream = stream.sorted(Comparator.comparingInt(String::length)); sortedStream.forEach(System.out::println); 输出结果是:apple, cherry, banana。 对自定义对象的排序: 对于自定义对象,可以通过实现Comparable接口来...
import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; public class Main { public static void main(String[] args) { List<Integer> numbers = Arrays.asList(3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5); // 对数字进行排序 List<Integer> sortedNumbers = numbers....
public static void main(String[] args) { List persons = prepareData(); // 使用Stream进行去重 List distinctPersons = persons.stream() .distinct() .collect(Collectors.toList()); // 使用Stream进行排序 List sortedPersons = persons.stream() ...
stream().collect(Collectors.toSet()); Iterator<User> iterator = collect.iterator(); while(iterator.hasNext()) { System.out.println(iterator.next().getUserId()); } 转mapMap<String, User> collect = students.stream().collect(Collectors.toMap(Student::getName, s -> s)); for (String ...
publicstaticvoidmain(String[]args){List<Tt>list=newArrayList<>();list.add(newTt(1,2));list.add(newTt(2,2));list.add(newTt(5,2));list.add(newTt(5,1));list.add(newTt(4,2));list.add(newTt(7,2));list.add(newTt(3,2));List<Tt>sortedList=list.stream().sorted(Comparator....
a.数据为null时排序在最前list=list.stream.sorted(Comparator.comparing(Student::getName),Comparator.nullsFirst(String::compareTo)).collect(Collectors.toList());b.数据为null时排序在最后list=list.stream.sorted(Comparator.comparing(Student::getName),Comparator.nullsLast(String::compareTo)).collect(Collec...
Stream的sorted() java8中,可以用Stream流的sorted()进行排序。 示例Bean 以下我们会使用这个Bean来做示例。 public class Order { private String weight; private Double price; private St