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
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ArrayList
Java
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