The containsKey() method of java.util.concurrent.ConcurrentSkipListMap is an in-built function in Java which returns a true boolean value if the specified element is present in this map otherwise it returns false.
Syntax:
public boolean containsKey(Object ob)
Parameter: The function accepts a single mandatory parameter ob which specifies the key whose presence in this map is to be tested.
Return Value: The function returns true if this map contains a mapping for the specified key.
Below programs illustrate the above method:
Program 1:
// Java Program Demonstrate containsKey() // 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);
// Checks if 9 is present in the map
if (mpp.containsKey( 9 ))
System.out.println( "9 is present"
+ " in the mpp." );
else
System.out.println( "9 is not present"
+ " in the mpp." );
}
} |
Program 2:
// Java Program Demonstrate containsKey() // 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);
// Checks if 4 is present in the map
if (mpp.containsKey( 4 ))
System.out.println( "4 is present"
+ " in the mpp." );
else
System.out.println( "4 is not present"
+ " in the mpp." );
}
} |