![]() Set result = highestKey != null ? highestKey.getValue() : Set. By calling keySet () method, you can get set object with all key values. Import static .* Įntry> highestKey = map.entrySet().stream() How to get all keys from HashMap - Java HashMap Programs Program: How to get all keys from HashMap Description: Below example shows how to get all keys from the given HashMap. Mapping() is used to make sure we get the keys of the original map as the value in the new map, whithout this we would get the entries as values.įinally, the last null check is needed in case of an empty map, because there won't be any last entry.Ī fully working example including imports: import By doing this, we can get the highest value by using lastEntry(). I want to get the key of a HashMap using the value. As a result, only keys of the created HashMap will be displayed on the console: Only want to get the values. By stating that it should collect into a TreeMap, it will be sorted according to it's keys. Get key from a HashMap using the value duplicate Ask Question Asked 11 years, 8 months ago Modified 6 years, 9 months ago Viewed 165k times 31 This question already has answers here : Java Hashmap: How to get key from value (39 answers) Closed 5 years ago. This method returns the set of all HashMap keys. ![]() ![]() By grouping by the value of the entries we can collect into a new map. It is pretty similar to HashTable, but the HashMap is unsynchronized and also allows to stole one null key. The HashMap class is available under the java.util package. Here we stream() over the entries in the map. Java HashMap How to Get Value from Key By Rahul Ap2 Mins Read Write a Java program to get value from the hashmap corresponding to a key. key is the first parameter, so in your put, 'one' is the key. Set result = highestKey != null ? highestKey.getValue() : Set.of() collect(groupingBy(Entry::getValue, TreeMap::new, mapping(Entry::getKey, toSet()))) ![]() Another way to achieve this by only processing the elements once could be to use an appropriate collector: Entry> highestKey = map.entrySet().stream() ![]()
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