Unexpected Behavior When Using Java 17 Stream API with Custom Comparator
I'm trying to debug I need some guidance on I can't seem to get I'm sure I'm missing something obvious here, but I've been banging my head against this for hours. I'm experiencing unexpected behavior when using the `Stream` API in Java 17 with a custom comparator for sorting a list of objects. I have a class `Person` with two fields: `name` and `age`. I want to sort a list of `Person` objects first by `age` and then by `name`. Here’s the code I’m using: ```java import java.util.*; import java.util.stream.*; class Person { String name; int age; Person(String name, int age) { this.name = name; this.age = age; } } public class Main { public static void main(String[] args) { List<Person> people = Arrays.asList( new Person("Alice", 30), new Person("Bob", 25), new Person("Eve", 30), new Person("Charlie", 25) ); List<Person> sortedPeople = people.stream() .sorted(Comparator.comparingInt(Person::age) .thenComparing(Person::name)) .collect(Collectors.toList()); sortedPeople.forEach(p -> System.out.println(p.name + " " + p.age)); } } ``` When I run this code, I expect the output to be sorted by age first and then by name, but the output seems to be random: ``` Bob 25 Charlie 25 Alice 30 Eve 30 ``` As you can see, the two `Person` objects with age 25 are sorted by name, but it seems that they are not in the expected order. I’ve tried checking the logic in the comparator, and it seems correct to me. Could this be an issue with how `Comparator.comparingInt` and `thenComparing` work together? Or am I missing something regarding the sorting behavior in streams? Any insights would be greatly appreciated! Thanks in advance! My development environment is macOS. Am I missing something obvious? I'm working with Java in a Docker container on Debian. Any help would be greatly appreciated! I'm coming from a different tech stack and learning Java. I'd love to hear your thoughts on this. My team is using Java for this CLI tool.