43 lines
1.3 KiB
Java
43 lines
1.3 KiB
Java
// typeinfo/pets/Individual.java
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// (c)2021 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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package typeinfo.pets;
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import java.util.*;
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public class
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Individual implements Comparable<Individual> {
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private static long counter = 0;
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private final long id = counter++;
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private String name;
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public Individual(String name) { this.name = name; }
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// 'name' is optional:
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public Individual() {}
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@Override public String toString() {
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return getClass().getSimpleName() +
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(name == null ? "" : " " + name);
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}
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public long id() { return id; }
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@Override public boolean equals(Object o) {
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return o instanceof Individual &&
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Objects.equals(id, ((Individual)o).id);
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}
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@Override public int hashCode() {
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return Objects.hash(name, id);
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}
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@Override public int compareTo(Individual arg) {
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// Compare by class name first:
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String first = getClass().getSimpleName();
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String argFirst = arg.getClass().getSimpleName();
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int firstCompare = first.compareTo(argFirst);
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if(firstCompare != 0)
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return firstCompare;
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if(name != null && arg.name != null) {
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int secondCompare = name.compareTo(arg.name);
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if(secondCompare != 0)
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return secondCompare;
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}
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return (arg.id < id ? -1 : (arg.id == id ? 0 : 1));
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}
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}
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