Is list an array in Java?

Converting between List and Array is a very common operation in Java.

The best and easiest way to convert a List into an Array in Java is to use the .toArray[] method.

Likewise, we can convert back a List to Array using the Arrays.asList[] method.

The examples below show how to convert List of String and List of Integers to their Array equivalents.

Convert List to Array of String

import java.util.ArrayList; import java.util.List; public class ConvertArrayListToArray { public static void main[String[] args] { List itemList = new ArrayList[]; itemList.add["item1"]; itemList.add["item2"]; itemList.add["item3"]; String[] itemsArray = new String[itemList.size[]]; itemsArray = itemList.toArray[itemsArray]; for[String s : itemsArray] System.out.println[s]; } }

We can use the same approach to convert List of Integers to Array of Integers, for example:

Related:

• How to loop through an ArrayList in Java
• How to remove duplicates from a list
• How to compare two ArrayLists in Java

Convert List to Array of Integers

import java.util.ArrayList; import java.util.List; public class ConvertArrayListToArray { public static void main[String[] args] { List intList = new ArrayList[]; intList.add[10]; intList.add[20]; intList.add[30]; Integer[] intArray = new Integer[intList.size[]]; intArray = intList.toArray[intArray]; for[Integer i : intArray] System.out.println[i]; } }

Convert String Array to List

You can also convert an Array back to a List. To do this, we use Arrays.asList[]. For example:

import java.util.ArrayList; import java.util.Arrays; import java.util.List; public class ConvertArrayToList { public static void main[String[] args] { String[] stringArray = {"item 1", "item 2", "item 3", "item 4"}; List stringList = new ArrayList[Arrays.asList[stringArray]]; for [String listItem : stringList] { System.out.println[listItem]; } } }

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