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4: Collections.unmodifiableList(new XYZList(myArray)).Create the List bypassing the Array as a parameter in the constructor of the List with the help of Arrays. Algorithm: Get the Array to be converted. That is a proper read‑only version of the array: the List returned contains the contents of the array but (I think) can be altered only by reassigning elements in the original array. In this method, the Array is passed as the parameter into the List constructor with the help of the Arrays.asList() method. 3: Collections.unmodifiableList(Arrays.asList(myArray)).We have seen however that the set() method can be used: did it alter the original array? That is rather like a read‑only version of the array but in a List. That gives you a List containing the exact contents of the array at the time of creation both can be changed independently because they are completely separate from each other. It acts like a list wrapped around an array, it provides a list view to an array. Public static List copy(List dst, List src) ) ) The java Arrays.asList function returns a fixed-size list that contains a java Array. It acts like a list wrapped around an array, it provides a list view.

#ARRAYS ASLIST HOW TO#

Then, we explained how to accomplish the same objective using external libraries.Dear mates, I have the following problem I actually do not totally understand. The java Arrays.asList function returns a fixed-size list that contains a java Array. In this tutorial, we will learn about asList(). In this article, we investigated multiple ways to convert an array to a list in Java.įirst, we illustrated several ways of converting arrays to lists using JDK. Arrays.asList() method creates a fixed-size List from the elements/objects or array that we pass as argument. The asList() method of class is used to return a fixed-size list backed by the specified array. Simarily, since it’s an exernal library, we have to add it’s dependency in pom.xml first. List integerList = new ArrayList(integerArray.length) ĬollectionUtils.addAll(integerList, integerArray) Let’s see it in action: public static void usingArraysAsList() The most easiest and straightforward approach to getting a mutable list from an array of elements is to use Arrays.asList() method. Let’s go down the rabbit hole and discover each method in detail. When we use the asList() method with the Collection.toArray(). Java 7 provides several classes and methods to turn an array into a list. It is the method of the Java Arrays class that belongs to java.util package. This method acts as a bridge between array-based and collection-based APIs, in combination with Collection.toArray (). La lista devuelta es serializable e implementa RandomAccess. The asList () method of class is used to return a fixed-size list backed by the specified array. Este método actúa como un puente entre las API basadas en arrays y las basadas en colecciones, en combinación con Collection.toArray (). If you are looking for the other way around, our article on how to convert a list to array does a great job in covering the topic. El método asList () de la clase se usa para devolver una lista de tamaño fijo respaldada por la array especificada. To conclude, we will look at some external libraries such as Guava and Apache Commons. Then, we are going to demonstrate how to achieve the same objective using Java 8 and above. ¿Qué es arrays asList en Java El método asList () de la clase java. In this article, we are going to cover in-depth all possible ways to convert an array into a list in Java.įirst, we will start by exploring different approaches that were introduced before Java 8.