Java Collections emptyList() Method with Examples

by Online Tutorials Library July 22, 2022

Java Collections emptyList() Method

The emptyList() method of Java Collections class is used to get a List that has no elements. These empty list are immutable in nature.

Syntax

Following is the declaration of emptyList() method:

Parameter

This method does not accept any parameter.

Returns

The emptyList() method returns an empty immutable list.

Exceptions

Compatibility Version

Java 1.5 and above

Example 1

  import java.util.*;  public class CollectionsEmptyListExample1 {  public static void main(String[] args) {       //Create an empty List           List EmptyList = Collections.emptyList();       System.out.println(“Empty list: “+EmptyList);       }    }  

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Output:

Empty list: []

Example 2

  import java.util.*;  public class CollectionsEmptyListExample2 {  public static void main(String[] args) {  //Create an empty List          List emptylist = Collections.emptyList();        System.out.println(“Created empty immutable list: “+emptylist);        //Try to add elements        emptylist.add(“A”);        emptylist.add(“B”);        }    }  

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Output:

Created empty immutable list: []  Exception in thread "main" java.lang.UnsupportedOperationException  at java.base/java.util.AbstractList.add(AbstractList.java:153)  at java.base/java.util.AbstractList.add(AbstractList.java:111)  at myPackage.CollectionsEmptyListExample1.main(CollectionsEmptyListExample1.java:9)

Example 3

  import java.util.*;  public class CollectionsEmptyListExample3 {  public static void main(String[] args) {  //Create an empty List            List empList = Collections.emptyList();        empList.add(1);        empList.add(2);            System.out.println(“Created empty immutable List: “+empList);             }    }  

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Output:

Exception in thread "main" java.lang.UnsupportedOperationException  at java.base/java.util.AbstractList.add(AbstractList.java:153)  at java.base/java.util.AbstractList.add(AbstractList.java:111)  at myPackage.CollectionsEmptyListExample3.main(CollectionsEmptyListExample3.java:8)

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Java Collections emptyList() Method with Examples

Java Collections emptyList() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

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