collect(toList())方法由Stream里的值生成一个列表,是一个及早求值操作。可以理解为Stream向Collection的转换。 注意这边的toList()其实是Collectors.toList(),因为采用了静态倒入,看起来显得简洁。 List<String> collected = Stream.of("a", "b", "c") .collect(Collectors.toList()); assertEquals(Arrays.as...
那么Java 8的用户怎么写呢?我看到也有网友直接给出了Java 8下的方法,就如下面这样: List<String>result=list.stream().filter(e->e.contains("didispace.com")).filter(e->e.length()>17).collect(Collectors.toList()); #Stream.toList()和Collectors.toList()的区别 ...
Stream<String>language = Stream.of("java", "python", "C++","php","java"); List<String>listResult = language.collect(Collectors.toList()); result.forEach(System.out::println); 1. 2. 3. 4. 5. //2.stream()代替流 List<String>list = Arrays.asList("java", "python", "C++","php...
从Java16开始,Stream有了直接toList方法, java8时候常用的方法是stringList.stream().filter(number -> Long.parseLong(number) > 1).collect(Collectors.toList())。 Stream toList() /** *Accumulatestheelementsofthisstreamintoa{@codeList}.Theelementsin *thelistwillbeinthisstream'sencounterorder,ifoneex...
Java 8 – Convert a Stream to LIST package com.mkyong.java8; import java.util.List; import java.util.stream.Collectors; import java.util.stream.Stream; public class Java8Example1 { public static void main(String[] args) { Stream<String> language = Stream.of("java", "python", "node")...
userList = userList.stream().filter(user -> user.getDepartment() =="研发部").collect(Collectors.toList()); //遍历用户列表 userList.forEach(System.out::println); } 执行结果: 1.3 findAny() 和 findFirst() 使用findAny() 和 findFirst() 获取第一条数据。
4、Map<String,UserInfo> 转 List<String>、List<UserInfo> // 取Map中的所有value 结果:List<UserInfo> userInfoList = retMap.values().stream().collect(Collectors.toList()); // 取Map中所有key 结果:List<String> strList = retMap.keySet().stream().collect(Collectors.toList());...
public static voidmain(String[]args){Map<Integer,String>map=newHashMap<>();map.put(10,"apple");map.put(20,"orange");map.put(30,"banana");map.put(40,"watermelon");map.put(50,"dragonfruit");System.out.println("\n1. Export Map Key to List...");List<Integer>result=map.entrySet...
; List<String> upperCaseNames = names.stream().map(String::toUpperCase).collect(Collectors.toList...
public class StreamTest {public static void main(String[] args) {String[] strArr = { "abcd", "bcdd", "defde", "fTr" };List<String> strList = Arrays.stream(strArr).map(String::toUpperCase).collect(Collectors.toList());List<Integer> intList = Arrays.asList(1, 3, 5, 7, 9, ...