public void convert_list_to_map_with_java () { Listmovies = new ArrayList(); movies.add(new Movie(1, "The Shawshank Redemption")); movies.add(new Movie(2, "The Godfather")); MapmappedMovies = new HashMap(); for (Movie movie : movies) { mappedMovies.put(movie.getRank(), movie);...
代码示例:将List转换为LinkedHashMap 接下来我们来看一个将List<String>转换为LinkedHashMap<String, Integer>的示例,其中键为字符串,值为字符串长度。 importjava.util.ArrayList;importjava.util.LinkedHashMap;importjava.util.List;importjava.util.Map;publicclassListToLinkedHashMap{publicstaticvoidmain(String[]...
请注意,这个示例假设List中的Person对象没有重复的id。如果有重复的id,并且你需要处理这种情况,你可以在convertToMap方法中添加适当的逻辑来处理key冲突。
importjava.util.Arrays;importjava.util.LinkedHashMap;importjava.util.List;importjava.util.stream.Stream;publicclassListToLinkedHashMapExample{publicLinkedHashMap<String,Integer>convertListToLinkedHashMap(List<String>list){LinkedHashMap<String,Integer>linkedHashMap=newLinkedHashMap<>();Stream<String>stream...
Java 8 – Convert List to Map package com.mkyong.java8 public class Hosting { private int Id; private String name; private long websites; public Hosting(int id, String name, long websites) { Id = id; this.name = name; this.websites = websites; ...
import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.commons.collections.MapUtils; public class Convert { public static void main(String[] args) { //1.数组转换为list,map String[] arr = {"123","456","789","123"}; ...
public void convert_list_to_map_with_java8_lambda () { Listmovies = new ArrayList(); movies.add(new Movie(1, "The Shawshank Redemption")); movies.add(new Movie(2, "The Godfather")); MapmappedMovies = movies.stream().collect(
Java List Java ArrayListExample 1: Convert Map to List import java.util.*; public class MapList { public static void main(String[] args) { Map<Integer, String> map = new HashMap<>(); map.put(1, "a"); map.put(2, "b"); map.put(3, "c"); map.put(4, "d"); map.put(5...
public void convert_list_to_map_with_java () { List<Movie> movies = new ArrayList<Movie>();movies.add(new Movie(1, "The Shawshank Redemption"));movies.add(new Movie(2, "The Godfather"));Map<Integer, Movie> mappedMovies = new HashMap<Integer, Movie>();for (Movie movie : movies) ...
importjava.util.ArrayList;importjava.util.HashMap;importjava.util.List;importjava.util.Map;publicclassRobustStringToMapConverter{publicstaticMap<String,List<String>>convertToMap(Stringinput){Map<String,List<String>>resultMap=newHashMap<>();String[]pairs=input.split(",");for(Stringpair:pairs){String...