In this example, we will see how to create an immutable ArrayList using Collections.unmodifiableList() method with an example.
Create Immutable ArrayList with Collections.unmodifiableList() Exmaple
public class ImmutableListExample {
public static void main(String[] args) {
// Creating an ArrayList of String using
List < String > fruits = new ArrayList < > ();
// Adding new elements to the ArrayList
fruits.add("Banana");
fruits.add("Apple");
fruits.add("mango");
fruits.add("orange");
fruits = Collections.unmodifiableList(fruits);
// Creating Immutable List
//fruits.add("Strawberry"); // Exception in thread "main"
// java.lang.UnsupportedOperationException<String> fruits = List.of("Banana", "Apple", "Mango", "Orange");
fruits.forEach(e - > System.out.println(e));
}
}
Output:
Banana
Apple
mango
orange
References
Java ArrayList Source Code Examples
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