{Map<Integer,String>M2L=newHashMap<>();M2L.put(1,"New York");M2L.put(2,"Toronto");M2L.put(3,"Berlin");List<Integer>ID=M2L.keySet().stream().collect(Collectors.toList());ID.forEach(System.out::println);List<String>NAME=M2L.values().stream().collect(Collectors.toList());NAME....
out.println("Printing HashMap keys from converted list : "); for (String key : schoolKeyList) { System.out.println(key); } // 2nd Example : Converting HashMap Values into ArrayList Collection<Integer> values = schoolAgeCriteria.values(); List<Integer> schoolValueList = new ArrayList<...
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<...
1 Itereate HashMap with HashSet as values 1 About Java HashMap: when key is a Set<Integer> 1 How to convert "Hashmap values of List type" into Set? 0 Convert a HashMap<Integer, List<String>> to HashMap<String, HashSet<Integer>> 1 Add element to Set when Set is the value...
A Java Map implementation is an collection that maps keys to values. Every Map Entry contains key/value pairs, and every key is associated with exactly one value. The keys are unique, so no duplicates are possible. A common implementation of the Map interface is a HashMap: Map<Integer, St...
Java 8 – Convert Map to LIST Few Java examples to convert a Map to a List 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 ...
Then it comes down to summing tax values by this key. Using a traditional for-loop it could look like this: Map<StudentAddressKey, BigDecimal> taxByKey = new HashMap<>(); for( Student student : studentList) { taxByKey.merge(student.getAddressKey(), //or build a new one from the ...
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 ...
Few Java examples to convert a Map to a ListMap<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,...
publicstatic<K,V>List<Map.Entry<K,V>>convertToList(Map<K,V>map) { returnmap.entrySet() .stream() .collect(Collectors.toList()); } publicstaticvoidmain(String[]args) { Map<String,Integer>asciiMap=newHashMap<>(); asciiMap.put("A",65); ...