The Java Collections emptyNavigableMap() method is used to get a map with no elements. A Navigable map is a data structure that can hold elements with key-value pairs.
Syntax:
public static final <Key,Value> SortedMap<Key,Value> emptyNavigableMap()
where,
- key is the key element
- value is the value element
Parameters: This method will take no parameters.
Return Type: It will return an empty Navigable map that is immutable.
Example 1:
Java
// Java program to create an empty navigable mapimport java.util.*; public class GFG { // main method public static void main(String[] args) { // create an empty navigable map SortedMap<String, String> data = Collections.emptyNavigableMap(); // display System.out.println(data); }} |
Output
{}
Example 2: In this program, we will create an empty navigable map and add elements to the map. This will return an error.
Java
// Java program to show the error while using// Collections emptyNavigableMap() Methodimport java.util.*; public class GFG { // main method public static void main(String[] args) { // create an empty navigable map SortedMap<String, String> data = Collections.emptyNavigableMap(); // add 3 elements data.put("1", "ojaswi"); data.put("2", "ramya"); data.put("3", "deepu"); // display System.out.println(data); }} |
Output:
Exception in thread "main" java.lang.UnsupportedOperationException
at java.util.Collections$UnmodifiableMap.put(Collections.java:1459)
at GFG.main(GFG.java:10)
Example 3:
Java
// Java program to show the error while using// Collections emptyNavigableMap() Methodimport java.util.*; public class GFG { // main method public static void main(String[] args) { // create an empty navigable map SortedMap<Integer, Integer> data = Collections.emptyNavigableMap(); // add 3 elements data.put(1, 34); data.put(2, 45); data.put(3, 56); // display System.out.println(data); }} |
Output:
Exception in thread "main" java.lang.UnsupportedOperationException
at java.util.Collections$UnmodifiableMap.put(Collections.java:1459)
at GFG.main(GFG.java:10)
