Java Collections emptyMap() Method with Examples
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,Â
- 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:Â
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)
