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Jul 2, 2009 · System.out.println(lst.size()); This will create a list of integers: List<Integer> lst = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10); If you already have the array of ints, there is not quick way to convert, you're better off with the loop.
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.
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.
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);
Dec 1, 2010 · How to convert an int[] array to a List? Direct answer using modern Java features: int[] array = {1, 2}; List<Integer> list = IntStream.of(array).boxed().toList(); System.out.println(list.contains(1)); // true Note: toList() is available since Java 16. An alternative since Java 8 would be collect(Collectors.toList()).
Feb 2, 2024 · Convert an int Array to ArrayList Using Java 8 Stream. Convert an int Array to an ArrayList Using an Enhanced for Loop in Java. Convert an int Array to a List of Integer Objects Using Guava. This tutorial introduces how we can convert an array of primitive int to an ArrayList in Java.
Apr 8, 2024 · Since Java 8, we can use the Stream API. We can provide a one-line solution using a Stream: int[] input = new int[]{1,2,3,4}; List<Integer> output = Arrays.stream(input).boxed().collect(Collectors.toList()); Alternatively, we could use IntStream:
Sep 14, 2022 · This post will discuss how to convert primitive integer array to list of Integer using plain Java, Guava library, and Apache Commons Collections.
Jan 24, 2018 · Below are the steps developers can use to convert the int array to a list of Integer. Convert the specified primitive array to a sequential stream using the Arrays.stream() method. Box each element of the stream to an Integer using the IntStream.boxed() method. Use the Collectors.toList() method to accumulate the input elements into a new List.
Dec 1, 2019 · In Java 8+, you can use the Stream API to convert an array to a list, as shown below: int[] years = {2015, 2016, 2017, 2018, 2019, 2020}; // convert array to list List<Integer> list = Arrays.stream( years).boxed().collect(Collectors.toList()); // print list elements. list.forEach(System. out ::println);
