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Apr 19, 2023 · There are numerous approaches to do the conversion of an array to a list in Java. A few of them are listed below. Brute Force or Naive Method. Using Arrays.asList () Method. Using Collections.addAll () Method. Using Java 8 Stream API. Using Guava Lists.newArrayList () 1. Brute Force or Naive Method.
In other words, List<int> is not possible. You can, however, have a List<Integer> using the Integer class that wraps the int primitive. Convert your array to a List with the Arrays.asList utility method. Integer[] numbers = new Integer[] { 1, 2, 3 }; List<Integer> list = Arrays.asList(numbers);
May 11, 2024 · In this quick tutorial, we’re going to learn how to convert between an Array and a List using core Java libraries, Guava and Apache Commons Collections. This article is part of the “Java – Back to Basic” series here on Baeldung.
Oct 1, 2008 · In Java 9, you can use List.of static factory method in order to create a List literal. Something like the following: List<Element> elements = List.of(new Element(1), new Element(2), new Element(3)); This would return an immutable list containing three elements.
Java provides five methods to convert Array into a List are as follows: Native Method. Using Arrays.asList () Method. Using Collections.addAll () Method. Using Java 8 Stream API. Using Guava Lists.newArrayList () Method. Native Method. It is the simplest method to convert Java Array into a List.
May 8, 2015 · List<Integer> list = Arrays.stream(ints).collect(Collectors.toList()); Java9 has introduced this method: List<Integer> list = List.of(ints); However, this will return an immutable list that you can't add to. You need to do the following to make it mutable: List<Integer> list = new ArrayList<Integer>(List.of(ints));
Dec 1, 2019 · There are multiple ways to convert an array to a list in Java. In this article, you will learn about different ways of converting an array to a List in Java. Convert an array to a list using a loop. Let us start with a simple example that shows how to convert a primitive array int[] to a List<Integer> by using a loop:
Oct 31, 2023 · The simplest way to convert an array to a list in Java is by using the Arrays.asList() method. This function transforms your array into a list in a snap. Here’s a quick example: String[] array = {"A", "B", "C"}; List<String> list = Arrays.asList(array); // Output: // [A, B, C] In this example, we have an array of strings array.
Mar 8, 2024 · An array can be converted to an ArrayList using the following methods: 1. Using the ArrayList.add () method to Manually add the Array elements in the ArrayList: This method involves creating a new ArrayList and adding all of the elements of the given array to the newly created ArrayList using add () method.
Jan 24, 2018 · This is one of the most common ways of converting an array T[] to a List<T> using the Arrays.asList() method. It can be coded for in a single line of code as shown below. Option1.java. As we can see in the below output, members of the integerList have been copied from the integerArray. Code Output.
