How to convert int[] into List<Integer> in Java?

How to Convert int[] into List<Integer> in Java?

So, you want to convert an int[] into a List<Integer> in Java, huh? Well, you've come to the right place! 🙌

The Problem

First things first, let's understand the problem at hand. You have an int[] array, and you want to convert it into a List<Integer> collection. The challenge here is that Java doesn't provide a straightforward way to do this conversion. 😲

The Common Approach: Looping Through the Array

The most common solution to this problem is to loop through the int[] array and add each element to a List<Integer> one by one. While this approach gets the job done, it might not be the most efficient or elegant solution. 🔄

int[] intArray = {1, 2, 3, 4, 5};
List<Integer> intList = new ArrayList<>();

for (int i : intArray) {
    intList.add(i);
}

The Java 8 Stream Solution

But fear not, my friend! Java 8 comes to the rescue with its powerful Stream API. Using streams, we can simplify the conversion process in just a single line of code. 😎

int[] intArray = {1, 2, 3, 4, 5};
List<Integer> intList = Arrays.stream(intArray).boxed().collect(Collectors.toList());

Let's break down this magical line of code:

• Arrays.stream(intArray) creates a stream of integers from the int[] array.

• .boxed() converts each primitive int element into its corresponding wrapper class Integer.

• .collect(Collectors.toList()) collects the Stream elements into a List<Integer>.

The Guava Library Solution

If you're a fan of the Guava library, you're in luck! Guava provides a handy method called Ints.asList() for converting an int[] into a List<Integer>. 🎉

int[] intArray = {1, 2, 3, 4, 5};
List<Integer> intList = Ints.asList(intArray);

Using Guava, you can achieve the conversion in a concise and readable manner.

The Call-to-Action

There you have it, folks! You now have multiple ways to convert an int[] into a List<Integer> in Java. So go ahead and give them a try in your next coding adventure. 😄

Which method did you find the most appealing? Have you encountered any other cool ways to solve this problem? Let me know in the comments below! Let's share our knowledge and make the Java community even stronger! 💪

Remember, coding is all about learning and exploring new possibilities. Keep embracing the challenges, and keep coding like a 🚀 rockstar! 💻💥