OnJava8-Examples/typeinfo/pets/Individual.java
2015-05-29 14:18:51 -07:00

47 lines
1.3 KiB
Java

//: typeinfo/pets/Individual.java
// ©2015 MindView LLC: see Copyright.txt
package typeinfo.pets;
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 &&
id == ((Individual)o).id;
}
@Override
public int hashCode() {
int result = 17;
if(name != null)
result = 37 * result + name.hashCode();
result = 37 * result + (int)id;
return result;
}
@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));
}
} ///:~