The emptyMap() method of Java Collections is a method that is used to return an empty map such that we can not change the data in map IE it is immutable.
Syntax:
public static final <Key,Value> Map<Key,Value> emptyMap()
where,
- key is the key element
- value is the value element
Parameters: This will not accept any parameters,
Return Type: This will return an empty map that is immutable.
Exceptions: It will not arise any exception.
Example 1:
Java
// Java program to create an empty mapimport java.util.*; public class GFG { // main method public static void main(String[] args) { // create an empty map Map<String, String> data = Collections.emptyMap(); System.out.println(data); }} |
Output
{}
Example 2:
Java
// Java program to create an// empty map and add elements// We will get an error because // the method will work on only // an empty mapimport java.util.*; public class GFG { // main method public static void main(String[] args) { // create an empty map Map<String, String> data = Collections.emptyMap(); // add element data.put("1", "python/R"); System.out.println(data); }} |
Output:
Exception in thread "main" java.lang.UnsupportedOperationException
at java.util.AbstractMap.put(AbstractMap.java:209)
at GFG.main(GFG.java:8)