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:
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:
Java
// Java code to show the implementation of// isEmpty method in SortedMap interfaceimport java.util.*;public class GfG { // Driver code public static void main(String[] args) { // Initializing a SortedMap SortedMap<String, String> map = new TreeMap<>(); System.out.println(map); System.out.println(map.isEmpty()); }} |
Output:
{}
true
Program 2: Below is the code to show the implementation of isEmpty().
Java
// Java code to show the implementation of// isEmpty method in SortedMap interfaceimport java.util.*;public class GfG { // Driver code public static void main(String[] args) { // Initializing a SortedMap SortedMap<String, String> map = new TreeMap<>(); map.put("1", "One"); map.put("3", "Three"); map.put("5", "Five"); map.put("7", "Seven"); map.put("9", "Ninde"); System.out.println(map); System.out.println(map.isEmpty()); }} |
Output:
{1=One, 3=Three, 5=Five, 7=Seven, 9=Ninde}
false
Reference: https://docs.oracle.com/javase/6/docs/api/java/util/ArrayList.html#contains(java.lang.Object)
