The containsValue() method is used to check whether a particular value is being mapped by a single or more than one key in the SortedMap. It takes the value as a parameter and returns True if that value is mapped by any of the keys in the map.
Syntax:
boolean containsValue(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.
Note: The containsValue() method in SortedMap is inherited from the Map interface in Java.
Below programs illustrate the containsValue() method:
Program 1: Mapping String Values to Integer Keys.
// Java code to illustrate // the containsValue() method import java.util.*;
public class Map_Demo {
public static void main(String[] args)
{
// Creating an empty SortedMap
SortedMap<Integer, String> map
= new TreeMap<Integer, String>();
// Mapping string values to int keys
map.put( 10 , "Geeks" );
map.put( 15 , "4" );
map.put( 20 , "Geeks" );
map.put( 25 , "Welcomes" );
map.put( 30 , "You" );
// Displaying the SortedMap
System.out.println(
"Initial Mappings are: "
+ map);
// Checking for the Value 'Geeks'
System.out.println(
"Is the value 'Geeks' present? "
+ map.containsValue( "Geeks" ));
// Checking for the Value 'World'
System.out.println(
"Is the value 'World' present? "
+ map.containsValue( "World" ));
}
} |
Initial Mappings are: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You} Is the value 'Geeks' present? true Is the value 'World' present? false
Program 2: Mapping Integer Values to String Keys.
// Java code to illustrate // the containsValue() method import java.util.*;
public class Map_Demo {
public static void main(String[] args)
{
// Creating an empty SortedMap
SortedMap<String, Integer> map
= new TreeMap<String, Integer>();
// Mapping int values to string keys
map.put( "Geeks" , 10 );
map.put( "4" , 15 );
map.put( "Geeks" , 20 );
map.put( "Welcomes" , 25 );
map.put( "You" , 30 );
// Displaying the SortedMap
System.out.println(
"Initial Mappings are: "
+ map);
// Checking for the Value '10'
System.out.println(
"Is the value '10' present? "
+ map.containsValue( 10 ));
// Checking for the Value '30'
System.out.println(
"Is the value '30' present? "
+ map.containsValue( 30 ));
// Checking for the Value '40'
System.out.println(
"Is the value '40' present? "
+ map.containsValue( 40 ));
}
} |
Initial Mappings are: {4=15, Geeks=20, Welcomes=25, You=30} Is the value '10' present? false Is the value '30' present? true Is the value '40' present? false
Note: The same operation can be performed with any type of Mappings with variation and combination of different data types.
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Map.html#containsValue(java.lang.Object)