// reflection/pets/Individual.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

package reflection.pets;

import java.util.*;

public class

Individual implements Comparable<Individual> {

private static long counter = 0;

private final long id = counter++;

private String name;

public Individual(String name) { this.name = name; }

// 'name' is optional:

public Individual() {}

@Override public String toString() {

return getClass().getSimpleName() +

(name == null ? "" : " " + name);

}

public long id() { return id; }

@Override public boolean equals(Object o) {

return o instanceof Individual &&

Objects.equals(id, ((Individual)o).id);

}

@Override public int hashCode() {

return Objects.hash(name, id);

}

@Override public int compareTo(Individual arg) {

// Compare by class name first:

String first = getClass().getSimpleName();

String argFirst = arg.getClass().getSimpleName();

int firstCompare = first.compareTo(argFirst);

if(firstCompare != 0)

return firstCompare;

if(name != null && arg.name != null) {

int secondCompare = name.compareTo(arg.name);

if(secondCompare != 0)

return secondCompare;

}

return (arg.id < id ? -1 : (arg.id == id ? 0 : 1));

}

}