What is computeIfAbsent?
The computeIfAbsent(Key, Function) method of HashMap class is used to compute value for a given key using the given mapping function, if key is not already associated with a value (or is mapped to null) and enter that computed value in Hashmap else null.Click to see full answer. In this way, what does computeIfAbsent return?…
The computeIfAbsent(Key, Function) method of HashMap class is used to compute value for a given key using the given mapping function, if key is not already associated with a value (or is mapped to null) and enter that computed value in Hashmap else null.Click to see full answer. In this way, what does computeIfAbsent return? computeIfAbsent() is your new friend for Map in Java Unlike putIfAbsent, here the API returns the existing value or the new value, allowing you to continue working on it more fluently.Also Know, what is MAP get? The get() method of Map interface in Java is used to retrieve or fetch the value mapped by a particular key mentioned in the parameter. It returns NULL when the map contains no such mapping for the key. Return Value: The method returns the value associated with the key_element in this Map collection. Just so, is computeIfAbsent thread safe? ConcurrentHashMap is, indeed, threadsafe. But it only means that all read/write operations on such map are internally synchronized. A good practice will be to use one of the atomic methods implemented by ConcurrentHashMap , i.e: computeIfAbsent(..) , putIfAbsent(..) , etc.What is MAP entrySet return?HashMap. entrySet() method in Java is used to create a set out of the same elements contained in the hash map. It basically returns a set view of the hash map or we can create a new set and store the map elements into them.
