An EnumMap
is similar to a Map
except that an EnumMap
only takes an enum as a key. Also, all the keys must be from a single enum type. For further details refer here.
The containsValue()
method of EnumMap
is used to check if one or more key is mapped to the specified value.
The syntax of the containsValue()
method is given below:
public boolean containsValue(Object value)
The value whose presence is to be checked is passed as an argument.
This method returns true
if the value has one or more key mapping. Otherwise, false
is returned.
The example below shows how to use the containsValue()
method.
import java.util.EnumMap;class ContainsValue {enum Days{MON, TUE, WED, THUR, FRI, SAT, SUN};public static void main( String args[] ) {EnumMap<Days, String> map = new EnumMap<>(Days.class);map.put(Days.MON, "chest");System.out.println( "The map is" + map);System.out.println("Checking if any is mapped to the value 'chest': "+ map.containsValue("chest"));System.out.println("Checking if any is mapped to the value 'arms': "+ map.containsValue("arms"));}}
In the above code:
In line 1, we import the EnumMap
class.
In line 3, we have created an enum for days of the week with the name Days
.
In line 7, we create an EnumMap
object with the name map
.
In line 8, we use the put
method to add a mapping {Days.MON="chest"}
to the map
object.
In line 10, we use the containsValue
method to check if any key is mapped to the value chest
. true
is returned as a result because in the map, the key Days.MON
is mapped to the value chest
.
In line 11, we use the containsValue
method to check if any key is mapped to the value arms
. false
is returned as a result because no key is mapped to the value arms
.