Java 8 New Hashmap

For example, the combined key would be donut.1, donut.2, and so on. This jdk 8 change applies only to hashmap, linkedhashmap and concurrenthashmap. Java 8 introduced lamda concept which is in funcitonal programming.

We can “flatten,” i.e., convert from nested map structure to a single map structure: It provides the basic implementation of the map interface of java. The initial default capacity of java hashmap class is 16 with a load factor of 0.75.

Java hashmap is non synchronized.

For demonstration, the phone directory map contains the names as keys and numbers as values. Concurrenthashmap (int initialcapacity) creates a new, empty map with an initial table size accommodating the specified number of elements without the need to dynamically resize. A combined key usually concatenates the two keys from the nested structure with a dot in between. We can put a value with using a key and also we can access this value using that.