An intuitive first attempt could be: int[] input = new int[]{1,2,3,4}; List output = Arrays.asList(input); Unfortunately, this won't compile due to type incompatibility. import java.util. In this example, we created a list of integers. Convert List How to Convert String Array to List It takes a list of type String as the input and converts each entity into a string array. 4. With Java 8, you can convert a List to Array in one line using stream() and toArray() utility methods. Convert String to Array in Java 1. There are four main collection interfaces namely Set Lists, Queues, Maps. In Java 8, we can use Stream to convert a list to an array. This post will discuss how to convert primitive integer array to list of Integer using plain Java, Guava library, and Apache Commons Collections. Converting ArrayList to Array. Conversion of Arraylist to Int Array Using a for Loop. The ArrayList.get () method is a manual way of converting all the ArrayList elements to the String Array. To convert List to an array, we are using the toArray() method of List interface that returns an array of Objects. The methods are: toArray() and toArray(T[] a). for (Integer e : list)
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