Likewise, we used the map's values() method to get all the values and created an ArrayList valueList from them. Example 2: Convert Map to List using stream import java.util.*; import java.util.stream.Collectors; public class MapList { public static void main(String[] args) { Map<...
Map<String, String> map = new HashMap<>(); // Convert all Map keys to a List List<String> result = new ArrayList(map.keySet()); // Convert all Map values to a List List<String> result2 = new ArrayList(map.values()); // Java 8, Convert all Map keys to a List List<String>...
Map<String, String> map = new HashMap<>(); // Convert all Map keys to a List List<String> result = new ArrayList(map.keySet()); // Convert all Map values to a List List<String> result2 = new ArrayList(map.values()); // Java 8, Convert all Map keys to a List List<String>...
Map<Integer, Animal> map = Maps .uniqueIndex(list, Animal::getId);returnmap; }Copy Finally, we test the conversion: @TestpublicvoidgivenAList_whenConvertWithGuava_thenReturnMapWithTheSameElements(){ Map<Integer, Animal> map = convertListService .convertListWithGuava(list); assertThat( map.values...
Learn to convert Map keys and values to the array, List or Set using the ArrayList and HashSet constructors as well as Stream APIs.
HashMap<String, Enum<?>> map =newHashMap<String, Enum<?>>();//from last to first, so that in case of duplicate values, first winsfor(inti = enumValues.length; --i >= 0; ) { Enum<?> en =enumValues[i];try{ Object o=accessor.invoke(en);if(o !=null) { ...
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2.4. Apache Commons Collection’sMapUtils.populateMap() We can useMapUtilsclass present inApache Commons Collectionslibrary to create aMapfrom aList. Map<Integer,Employee>employeeMap=newHashMap<>();MapUtils.populateMap(employeeMap,uniqueEmployeeList,Employee::id); ...
We start by creating an emptyHashMapto store the resulting key-value pairs. Then, we loop through each element in theJsonArray.EachJsonElementis converted to aJsonObjectto facilitate the extraction of its fields. When using Gson, numeric values are often represented asJsonPrimitiveobjects containin...
How do I convert a map into a JSON string? How do I obtain the class name of an object? How do I delete an element from a record? How do I convert a JSON object into a HashMap? How do I convert an ArrayBuffer to a string? How do I convert the Uint8Array type to the...