The
contains() method of
Java.util.ConcurrentHashMap is used to check whether if some key maps into the specified value in this table. It is a legacy method of performing a particular task. The operation is similar to containsValue() Method of ConcurrentHashMap.
Syntax:
ConcurrentHashMap.contains(Object Value)
Parameters: The method takes just one parameter
Value of Object type and refers to the value whose mapping is supposed to be checked by any key inside the map.
Return Value: The method returns boolean true if the mapping of the value is detected else false.
Below programs are used to illustrate the working of ConcurrentHashMap.containsValue() 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 value 'Geeks' present? true
Is the value 'World' present? false
Program 2: Mapping Integer Values to String Keys.
Output:
Initial Mappings are: {4=15, Geeks=20, You=30, Welcomes=25}
Is the value 'Geeks' present? true
Is the value 'World' present? false
Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.
