import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

/**
 * Another kind of boring use of lambda
 * Again, all this really does is reduce some a few lines of code
 * Interestingly, this does require type inference in java
 * 
 * Created: Oct 7, 2023
 * @author gtowell
 */
public class LamSort {
    private class Human {
        String name;
        int age;

        public Human(String n, int a) {
            name = n;
            age = a;
        }

        public String toString() {
            return "<<" + name + ":" + age + ">>";
        }
    }

    public static void main(String[] args) {
        (new LamSort()).doo();
    }
    public void doo() {
    List<Human> humans = Arrays.asList(
      new Human("Sarah", 10), 
      new Human("Jacky", 52),
      new Human("Zelda", 33)
    );
    // without lambda implement the Comparable interface 
    Collections.sort(humans, new Comparator<Human>() {
        @Override
        public int compare(Human h1, Human h2) {
            return h1.name.compareTo(h2.name);
        }
    });
    System.out.println(humans);

    // with lambda, again, implementing the comparable interface
    // This looks like you are passing a function to the sort, which would imply that
    // lambda functions are not third class in Java. 
    // But NO. Really passing an object. 
    // Only works because the interface has ONE method.
    Collections.sort(humans, (a, b) -> a.age - b.age);
    System.out.println(humans);

}
}