Java Collections emptyMap() Method with Examples

by Online Tutorials Library July 22, 2022

Java Collections emptyMap() Method

The emptyMap() method of Java Collections class returns an empty map which is immutable.

Syntax

Following is the declaration of emptyMap() method:

Parameter

This method does not accept any parameter.

Returns

The emptyMap() method returns an empty immutable Map.

Exceptions

Compatibility Version

Java 1.5 and above

Example 1

  import java.util.*;  public class CollectionsEmptyMapExample1 {  public static void main(String[] args) {       //Create an empty Map           Map EmptyMap = Collections.emptyMap();       System.out.println(“Created Empty Map: “+EmptyMap);       }    }  ,string>

Test it Now

Output:

Created Empty Map: {}

Example 2

  import java.util.*;  public class CollectionsEmptyMapExample2 {  public static void main(String[] args) {       //Create an empty Map          Map EmptyMap = Collections.emptyMap();       System.out.println(“Created Empty Map: “+EmptyMap);       // try to add elements       EmptyMap.put(“1″,”from tutoraspire.com”);       }    }  ,string>

Test it Now

Output:

Created Empty Map: {}  Exception in thread "main" java.lang.UnsupportedOperationException  at java.base/java.util.AbstractMap.put(AbstractMap.java:209)  at myPackage.CollectionsEmptyMapExample2.main(CollectionsEmptyMapExample2.java:9)

Example 3

  import java.util.*;  public class CollectionsEmptyMapExample3 {  public static void main(String[] args) {  //Create an empty Map            Map empMap = Collections.emptyMap();        empMap.put(1, 23424);        empMap.put(2, 65776);            System.out.println(“Created empty immutable Map: “+empMap);             }    }  ,>

Test it Now

Output:

Exception in thread "main" java.lang.UnsupportedOperationException  at java.base/java.util.AbstractMap.put(AbstractMap.java:209)  at myPackage.CollectionsEmptyMapExample3.main(CollectionsEmptyMapExample3.java:7)

Next TopicJava Collections Class

addAll()asLifoQueue()binarySearch()checkedCollection()CheckedMap()checkedQueue()checkedSet()collections copy()disjoint()emptyEnumeration()fill()java list max min reverse sort synchronizedMap()

Java Collections emptyMap() Method with Examples

Java Collections emptyMap() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

Difference between Webpage and Website

PHP htmlentities() function

You may also like