我喜欢Kango_V的答案，但我认为它太复杂了。我认为这个更简单，也许太简单了。如果愿意，您可以用通用标记替换String，并使其适用于任何键类型。

public static <E> Map<String, E> convertListToMap(Collection<E> sourceList, ListToMapConverterInterface<E> converterInterface) {
    Map<String, E> newMap = new HashMap<String, E>();
    for( E item : sourceList ) {
        newMap.put( converterInterface.getKeyForItem( item ), item );
    }
    return newMap;
}

public interface ListToMapConverterInterface<E> {
    public String getKeyForItem(E item);
}

这样用:

        Map<String, PricingPlanAttribute> pricingPlanAttributeMap = convertListToMap( pricingPlanAttributeList,
                new ListToMapConverterInterface<PricingPlanAttribute>() {

                    @Override
                    public String getKeyForItem(PricingPlanAttribute item) {
                        return item.getFullName();
                    }
                } );

如果没有java-8，你可以在一行Commons集合和Closure类中完成这些

List<Item> list;
@SuppressWarnings("unchecked")
Map<Key, Item> map  = new HashMap<Key, Item>>(){{
    CollectionUtils.forAllDo(list, new Closure() {
        @Override
        public void execute(Object input) {
            Item item = (Item) input;
            put(i.getKey(), item);
        }
    });
}};

如果你使用Kotlin，这里有一个例子:

listOf("one", "two").mapIndexed { i, it -> i to it }.toMap()

List<Item> list;
Map<Key,Item> map = new HashMap<Key,Item>();
for (Item i : list) map.put(i.getKey(),i);

当然，假设每个Item都有一个getKey()方法，该方法返回一个正确类型的键。

一个Java 8转换List<?>的对象到Map<k, v>:

List<Hosting> list = new ArrayList<>();
list.add(new Hosting(1, "liquidweb.com", new Date()));
list.add(new Hosting(2, "linode.com", new Date()));
list.add(new Hosting(3, "digitalocean.com", new Date()));

//example 1
Map<Integer, String> result1 = list.stream().collect(
    Collectors.toMap(Hosting::getId, Hosting::getName));

System.out.println("Result 1 : " + result1);

//example 2
Map<Integer, String> result2 = list.stream().collect(
    Collectors.toMap(x -> x.getId(), x -> x.getName()));

从下面复制的代码: https://www.mkyong.com/java8/java-8-convert-list-to-map/

public class EmployeeDetailsFetchListToMap {
  public static void main(String[] args) {
    List<EmployeeDetailsFetch> list = new ArrayList<>();
    list.add(new EmployeeDetailsFetch(1L, "vinay", 25000F));
    list.add(new EmployeeDetailsFetch(2L, "kohli", 5000000F));
    list.add(new EmployeeDetailsFetch(3L, "dhoni", 20000000F));

    //adding id as key and map of id and student name
    Map<Long, Map<Long, String>> map1 = list.stream()
        .collect(
            Collectors.groupingBy(
                EmployeeDetailsFetch::getEmpId,
                Collectors.toMap(
                    EmployeeDetailsFetch::getEmpId,
                    EmployeeDetailsFetch::getEmployeeName
                )
            )
        );
    System.out.println(map1);

    //converting list into map of Student
    //Adding id as Key and Value as Student into a map
    Map<Long, EmployeeDetailsFetch> map = list.stream()
        .collect(
            Collectors.toMap(
                EmployeeDetailsFetch::getEmpId, 
                EmployeeDetailsFetch -> EmployeeDetailsFetch
            )
        );

    for(Map.Entry<Long, EmployeeDetailsFetch> m : map.entrySet()) {
      System.out.println("key :" + m.getKey() + "  Value : " + m.getValue());
    }
  }
}