This topic is about 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
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