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A guide on how to effectively initialize a `List Short ` in one line in Java using streams and collections.
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How to Initialize List<Short> in One Line in Java?

In the world of Java programming, efficiently managing collections of data is essential. One common requirement is to initialize a List<Short> in a succinct manner. However, many developers encounter challenges in doing this, especially when trying to leverage more modern methods of collection initialization. In this post, we'll examine how to properly initialize a list of shorts in just one line, which can make your code cleaner and more efficient.

The Problem

You might be attempting to create a List<Short> in Java using the following syntax:

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However, this approach raises a compilation error, typically stating: "Cannot resolve constructor 'ArrayList(java.util.List<E>)'". This happens because you're trying to directly instantiate an ArrayList with a list of integers, which won't automatically convert them to shorts.

The Solution

To solve this problem, we can make use of Java Streams. This method allows for in-line conversions and is very effective for initializing lists with different data types. By using the Stream.of() method, we can convert integers to shorts and collect them into a list. Here is how you can do it:

Step-by-Step Guide

Import Required Packages:
Make sure to import the necessary classes at the top of your Java file:

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Use Stream for Conversion:
You can initiate a List<Short> in one line like this:

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Explanation

Stream.of(): This method creates a stream of the specified integers.

map() Method: The map() function applies a transformation to each element. Here, we're casting each integer to a short using value -> (short) value.intValue().

collect() Method: Finally, we use collect(Collectors.toList()) to gather the results into a List<Short>.

Complete Example

Here’s how your complete Java code may look:

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Output

When you run the above example, the output will be:

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Conclusion

Initializing a List<Short> in Java can be achieved efficiently using Java Streams. This approach not only resolves the issues of type conversion but also produces a clean and readable code structure. By embracing such techniques, you can enhance your coding practices and effortlessly manage collections in Java.

Implementing this one-liner can simplify your code and improve productivity as you no longer need to handle conversions in multiple steps.

Happy coding!