AbstractMap containsValue() Method in Java with Examples
Last Updated :
24 Oct, 2018
The
containsValue() method of the
AbstractMap is used to check whether a particular value is being mapped by a single or more than one key in the AbstractMap. It takes the Value as a parameter and returns True if that value is mapped by any of the keys in the map.
Syntax:
AbstractMap.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.
Below programs are used to illustrate the working of AbstractMap.containsValue() Method:
Program 1: Mapping String Values to Integer Keys.
Java
// Java code to illustrate
// the containsValue() method
import java.util.*;
public class Abstract_Map_Demo {
public static void main(String[] args)
{
// Creating an empty AbstractMap
AbstractMap<Integer, String>
abs_map = new HashMap<Integer, String>();
// Mapping string values to int keys
abs_map.put(10, "Geeks");
abs_map.put(15, "4");
abs_map.put(20, "Geeks");
abs_map.put(25, "Welcomes");
abs_map.put(30, "You");
// Displaying the AbstractMap
System.out.println("Initial Mappings are: "
+ abs_map);
// Checking for the Value 'Geeks'
System.out.println("Is the value"
+ " 'Geeks' present? "
+ abs_map.containsValue("Geeks"));
// Checking for the Value 'World'
System.out.println("Is the value"
+ " 'World' present? "
+ abs_map.containsValue("World"));
}
}
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.
Java
// Java code to illustrate
// the containsValue() method
import java.util.*;
public class Abstract_Map_Demo {
public static void main(String[] args)
{
// Creating an empty AbstractMap
AbstractMap<String, Integer>
abs_map = new HashMap<String, Integer>();
// Mapping int values to string keys
abs_map.put("Geeks", 10);
abs_map.put("4", 15);
abs_map.put("Geeks", 20);
abs_map.put("Welcomes", 25);
abs_map.put("You", 30);
// Displaying the AbstractMap
System.out.println("Initial Mappings are: "
+ abs_map);
// Checking for the Value '10'
System.out.println("Is the value"
+ " '10' present? "
+ abs_map.containsValue(10));
// Checking for the Value '30'
System.out.println("Is the value"
+ " '30' present? "
+ abs_map.containsValue(30));
// Checking for the Value '40'
System.out.println("Is the value"
+ " '40' present? "
+ abs_map.containsValue(40));
}
}
Output:
Initial Mappings are: {4=15, Geeks=20, You=30, Welcomes=25}
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.