Java Coding Problems

Sorting by key and value via Stream and Comparator

Once we create a Stream for a map, we can easily sort it by means of the Stream.sorted() method with or without a Comparator. This time, let's use a Comparator:

public static <K, V> Map<K, V> sortByKeyStream(    Map<K, V> map, Comparator<? super K> c) {  return map.entrySet()    .stream()    .sorted(Map.Entry.comparingByKey(c))    .collect(toMap(Map.Entry::getKey, Map.Entry::getValue,      (v1, v2) -> v1, LinkedHashMap::new));}public static <K, V> Map<K, V> sortByValueStream(    Map<K, V> map, Comparator<? super V> c) {  return map.entrySet()    .stream()    .sorted(Map.Entry.comparingByValue(c))    .collect(toMap(Map.Entry::getKey, Map.Entry::getValue,      (v1, v2) -> v1, LinkedHashMap::new));}

We need to rely on LinkedHashMap ...