Create the Immutable ArrayList with List.of() Method Example

In this example, we will see how to create the Immutable ArrayList with Java 9 List.of() method example.

Create the Immutable List Example - Java 9 List.of() Method

Let's use List.of() static factory methods to create immutable lists.

package net.javaguides.corejava.java9;

import java.util.List;

/**
 * Java 9 Immutable List Example
 * @author Ramesh Fadatare
 *
 */
public class ImmutableListExample {

    public static void main(String[] args) {

        // Creating Immutable List
        List < String > fruits = List.of("Banana", "Apple", "Mango", "Orange");
        fruits.forEach(e - > System.out.println(e));

        // You can't add Elements Immutable List
        // fruits.add("Strawberry"); // Exception in thread "main" java.lang.UnsupportedOperationException

        // in single list
        List < String > list = List.of("A", "B", "C", "D");
        list.forEach(e - > System.out.println(e));
    }
}

Output:

Banana
Apple
mango
orange
A
B
C
D

References

• https://www.javaguides.net/2019/12/java-9-listof-method-create-immutable.html

Java ArrayList Source Code Examples

• Sort List of Integers in Ascending and Descending Order Example
• List (ArrayList) Iterator Example
• Create the Immutable ArrayList with List.of() Method Example
• Create Immutable ArrayList with Collections.unmodifiableList() Exmaple
• Java 10 - Copy List into Another List Exmaple
• Java 8 - Copy List into Another List Example
• Java - Copy a List to Another List using Collections.copy() method
• Java - Copy a List to Another List Example
• Java ArrayList spliterator() Method Example
• Java ArrayList sort() Method Example
• Java ArrayList retainAll() Method Example
• Java ArrayList removeIf() Method Example
• Java ArrayList removeAll() Method Example
• Java ArrayList remove() Method Example
• Java ArrayList lastIndexOf() Method Example
• Java ArrayList isEmpty() Method Example
• Java util ArrayList indexOf() Method Example
• Java ArrayList get() Method Example
• Java ArrayList ensureCapacity() Method Example
• Java ArrayList contains() Method Example
• Java ArrayList clone() Method Example
• Java ArrayList clear() Method Example
• Java ArrayList addAll() Method Example
• Java ArrayList add() Method Example
• Java 8 forEach() List Example
• Add Enum Values to ArrayList Example
• Join List Strings with Commas in Java
• Java Stream filter null values example
• Java ArrayList subList() Example
• Get Index of Elements in ArrayList Example
• Java ArrayList removeIf() Example
• Java ArrayList add(), get() and set() Method Example
• Iterate over ArrayList Using forEach Java
• Iterate over ArrayList using Iterator in Java
• Java ArrayList indexOf() and lastIndexOf() Example
• Search an Element in an ArrayList in Java
• Clear ArrayList in Java Example
• Java ArrayList removeAll() Method Example
• Java ArrayList remove() Method Example
• How to Iterate over ArrayList in Java
• How to Remove Element from ArrayList in Java
• How to Access Elements of ArrayList in Java
• Create ArrayList from Another ArrayList in Java
• How to Create an ArrayList and Add Elements to It