how to convert a list into an array in java code example

Example 1: java array to list

Integer[] spam = new Integer[] { 1, 2, 3 };
List<Integer> list = Arrays.asList(spam);

Example 2: java list to array

String[] arr = list.toArray(new String[list.size()]);

Example 3: convert list to array in java

Integer[] arr = new Integer[al.size()]; 
arr = al.toArray(arr);