ConcurrentSkipListMap containsValue() method in Java with Examples

The containsValue() method of java.util.concurrent.ConcurrentSkipListMap is an in-built function in Java which returns true if this map maps one or more keys to the specified value. The method returns null if there is no key to be mapped. The method throws NullPointerException when the specified value is null.

Syntax:

public boolean containsValue(Object ob)

Parameter: The function accepts a single mandatory parameter ob which specifies the value whose presence is to be tested.

Return Value: The function returns true if mapping exists or else returns false.

Exception: The method throws NullPointerException when the specified value is null.



Below programs illustrate the above method:

Program 1:

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// Java Program Demonstrate containsValue()
// method of ConcurrentSkipListMap
  
import java.util.concurrent.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        // Initializing the map
        ConcurrentSkipListMap<Integer, Integer>
            mpp = new ConcurrentSkipListMap<Integer,
                                            Integer>();
  
        // Adding elements to this map
        for (int i = 1; i <= 5; i++)
            mpp.put(i, i);
  
        // checking whether onject present in map
        System.out.println(mpp.containsValue(4));
    }
}

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Output:

true

Program :

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// Java Program Demonstrate containsValue()
// method of ConcurrentSkipListMap
  
import java.util.concurrent.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        // Initializing the map
        ConcurrentSkipListMap<Integer, Integer>
            mpp = new ConcurrentSkipListMap<Integer,
                                            Integer>();
  
        // Adding elements to this map
        for (int i = 1; i <= 5; i++)
            mpp.put(i, i);
  
        // checking whether onject present in map
        System.out.println(mpp.containsValue(7));
    }
}

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Output:

false

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListMap.html#containsValue-java.lang.Object-



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