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Sort a list that places nulls first in Java
Let us create a list first with string elements. Some of the elements are null in the List:
List<String> list = Arrays.asList("Jack", null, "Thor", null, "Loki", "Peter", null, "Hulk");
Now, sort the above list and place nulls first with nullsFirst:
list.sort(Comparator.nullsFirst(String::compareTo));
The following is an example to sort a List that places nulls first:
Example
import java.util.Arrays; import java.util.Comparator; import java.util.List; public class Demo { public static void main(String... args) { List<String> list = Arrays.asList("Jack", null, "Thor", null, "Loki", "Peter", null, "Hulk"); System.out.println("Initial List = "+list); list.sort(Comparator.nullsFirst(String::compareTo)); System.out.println("List placing nulls first = "+list); } }
Output
Initial List = [Jack, null, Thor, null, Loki, Peter, null, Hulk] List placing nulls first = [null, null, null, Hulk, Jack, Loki, Peter, Thor]
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