SortedMap isEmpty() method in Java with Examples
The isEmpty() method of SortedMap interface in Java is used to check if a map is having any entry for key and value pairs. If no mapping exists, then this returns true.
Syntax:Â
boolean isEmpty()
Parameters: This method has no argument.
Returns: This method returns True if the map does not contain any key-value mapping.
Note: The isEmpty() method in SortedMap is inherited from the Map interface in Java
Below programs show the implementation of int isEmpty() method:
Program 1:Â Â
Java
// Java code to show the implementation of// isEmpty method in SortedMap interfaceÂ
import java.util.*;Â
public class GfG {Â
    // Driver code    public static void main(String[] args)    {Â
        // Initializing a SortedMap        SortedMap<String, String> map            = new TreeMap<>();Â
        System.out.println(map);Â
        System.out.println(map.isEmpty());    }} |
Output:Â
{}
true
Â
Program 2: Below is the code to show the implementation of isEmpty().
Java
// Java code to show the implementation of// isEmpty method in SortedMap interfaceÂ
import java.util.*;Â
public class GfG {Â
    // Driver code    public static void main(String[] args)    {Â
        // Initializing a SortedMap        SortedMap<String, String> map            = new TreeMap<>();Â
        map.put("1", "One");        map.put("3", "Three");        map.put("5", "Five");        map.put("7", "Seven");        map.put("9", "Ninde");        System.out.println(map);Â
        System.out.println(map.isEmpty());    }} |
Output:Â
{1=One, 3=Three, 5=Five, 7=Seven, 9=Ninde}
false
Â
Reference: https://docs.oracle.com/javase/6/docs/api/java/util/ArrayList.html#contains(java.lang.Object)
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