66 lines
1.9 KiB
Java
66 lines
1.9 KiB
Java
// collections/MapOfList.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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// {java collections.MapOfList}
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package collections;
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import typeinfo.pets.*;
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import java.util.*;
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public class MapOfList {
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public static final Map<Person, List< ? extends Pet>>
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petPeople = new HashMap<>();
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static {
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petPeople.put(new Person("Dawn"),
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Arrays.asList(
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new Cymric("Molly"),
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new Mutt("Spot")));
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petPeople.put(new Person("Kate"),
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Arrays.asList(new Cat("Shackleton"),
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new Cat("Elsie May"), new Dog("Margrett")));
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petPeople.put(new Person("Marilyn"),
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Arrays.asList(
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new Pug("Louie aka Louis Snorkelstein Dupree"),
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new Cat("Stanford"),
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new Cat("Pinkola")));
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petPeople.put(new Person("Luke"),
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Arrays.asList(
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new Rat("Fuzzy"), new Rat("Fizzy")));
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petPeople.put(new Person("Isaac"),
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Arrays.asList(new Rat("Freckly")));
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}
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public static void main(String[] args) {
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System.out.println("People: " + petPeople.keySet());
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System.out.println("Pets: " + petPeople.values());
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for(Person person : petPeople.keySet()) {
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System.out.println(person + " has:");
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for(Pet pet : petPeople.get(person))
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System.out.println(" " + pet);
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}
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}
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}
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/* Output:
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People: [Person Dawn, Person Kate, Person Isaac, Person
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Marilyn, Person Luke]
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Pets: [[Cymric Molly, Mutt Spot], [Cat Shackleton, Cat
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Elsie May, Dog Margrett], [Rat Freckly], [Pug Louie aka
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Louis Snorkelstein Dupree, Cat Stanford, Cat Pinkola],
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[Rat Fuzzy, Rat Fizzy]]
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Person Dawn has:
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Cymric Molly
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Mutt Spot
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Person Kate has:
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Cat Shackleton
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Cat Elsie May
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Dog Margrett
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Person Isaac has:
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Rat Freckly
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Person Marilyn has:
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Pug Louie aka Louis Snorkelstein Dupree
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Cat Stanford
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Cat Pinkola
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Person Luke has:
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Rat Fuzzy
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Rat Fizzy
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*/
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