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What is AbstractMap.containsKey() in Java?
Hammad Nasir
AbstractMap.containsKey() in Java is a method of the AbstractMap class. The method is used to check whether a key is mapped into the AbstractMap or not.
Syntax
public boolean containsKey(Object key)
Parameters
The function takes in one parameter.
key: the key whose mapping is to be examined inside a map.
Return value
-
The function returns a
Booleanvalue. -
The function returns
trueifAbstractMapincludes a mapping for key. -
Otherwise,
falseis returned.
Code
import java.util.*;
public class Abstract_Map_Class{
public static void main(String[] args)
{
// empty AbstractMap is created
AbstractMap<Integer, String> temp_absMap1 = new TreeMap<Integer, String>();
// populating temp_absMap1
temp_absMap1.put(1, "Hello");
temp_absMap1.put(2, "from");
temp_absMap1.put(3, "Educative");
System.out.println("Displaying temp_absMap1 : " + temp_absMap1);
System.out.println("** Checking temps_absMap1 to see if key 1 is present **");
System.out.println("Result : " + temp_absMap1.containsKey(1));
System.out.println("** Checking temps_absMap1 to see if key 4 is present **");
System.out.println("Result : " + temp_absMap1.containsKey(4));
}
}RELATED TAGS
java
map
mapping
key
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CONTRIBUTOR
Hammad Nasir
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