Java 11 - Collections to Array

Java 11 introduced an easy way to convert a collection to an array.

Old Way

 nameArray = nameList.toArray(new String[nameList.size()]); 

New Way

 nameArray = nameList.toArray(String[]::new); 

Consider the following example −

ApiTester.java

 import java.util.Arrays; import java.util.List; public class APITester { public static void main(String[] args) { List<String> namesList = Arrays.asList("Joe", "Julie"); // Old way String[] names = namesList.toArray(new String[namesList.size()]); System.out.println(names.length); // New way names = namesList.toArray(String[]::new); System.out.println(names.length); } } 

Output

 2 2