The
AbstractMap.containsKey() method is used to check whether a particular key is being mapped into the AbstractMap or not. It takes the key element as a parameter and returns True if that element is mapped in the map.
Syntax:
AbstractMap.containsKey(key_element)
Parameters: The method takes just one parameter
key_element that refers to the key whose mapping is supposed to be checked inside a map.
Return Value: The method returns boolean true if the presence of the key is detected else false .
Below programs are used to illustrate the working of AbstractMap.containsKey() Method:
Program 1: Mapping String Values to Integer Keys.
Output:
Initial Mappings are: {20=Geeks, 25=Welcomes, 10=Geeks, 30=You, 15=4}
Is the key '20' present? true
Is the key '5' present? false
Program 2: Mapping Integer Values to String Keys.
Output:
Initial Mappings are: {4=15, Geeks=20, You=30, Welcomes=25}
Is the key 'Welcomes' present? true
Is the key 'World' present? false
Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.
