Java HashMap.get() is a method in the Java HashMap class that retrieves the value associated with a given key. If the key is present in the map, it returns the corresponding value; otherwise, it returns null. Introduced in Java 1995 with Java 1.2, get() is commonly used in applications that require fast access to data by key, such as caching and look-up table systems.

https://docs.oracle.com/javase/8/docs/api/java/util/HashMap.html