In this example we shall show you how to convert an array to a Map. We are using the org.apache.commons.lang3.ArrayUtils class, that provides operations on arrays, primitive arrays (like int[]) and primitive wrapper arrays (like Integer[]). This class tries to handle null input gracefully. An exception will not be thrown for a null array input. To convert an array to a Map one should perform the following steps:
- Create a two-dimensional array of String items.
- Use
toMap(Object[] array)method ofArrayUtilsclass to convert the given array into a Map. - Print the values of the map,
as described in the code snippet below.
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | package com.javacodegeeks.snippets.core;import org.apache.commons.lang3.ArrayUtils;import java.util.Map;public class Array2Map { public static void main(String[] args) { // Two dimensional array of items String[][] arrayItems = {{"key0", "Item0"},{"key1", "Item1"},{"key2", "Item2"},{"key3", "Item3"},{"key4", "Item4"}}; // Convert to Map. The first index of each row of the array will be the key of the Item Map mapItems = ArrayUtils.toMap(arrayItems); // Print some value for testing System.out.println("The item with key0 is : " + mapItems.get("key0")); System.out.println("The item with key3 is : " + mapItems.get("key3")); }} |
Output:
The item with key0 is : Item0
The item with key3 is : Item3
This was an example of how to convert an array to a Map in Java.
