@param value the value for the entry, may be null
@param key the key for the entry, may be null
@description constructs a new entry with the specified key and given value.
file : https_github_com_apache_commons-collections_git/src/main/java/org/apache/commons/collections4/keyvalue/UnmodifiableMapEntry.java
file : https_github_com_apache_commons-collections_git/src/main/java/org/apache/commons/collections4/keyvalue/DefaultMapEntry.java