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Apresentação sobre google collection
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Wende Mendes HiginoWende Mendes Higino
email: wende.mendes@bluesoft.com.bremail: wende.mendes@bluesoft.com.br
Google CollectionsGoogle Collections
ObjetivoObjetivo
Google CollectionsGoogle Collections
- List- List
- Set- Set
- Map- Map
- Multimap- Multimap
- Multiset- Multiset
Google CollectionsGoogle Collections
ListList
Google CollectionsGoogle Collections
Antes:
final List<String> dias = new ArrayList<String>();dias.add("Segunda");dias.add("Terça");
Agora:
final List<String> dias = Lists.newArrayList("Segunda", "Terça");
Google CollectionsGoogle Collections
MapMap
Google CollectionsGoogle Collections
Antes:
final Map<Integer, Fornecedor> fornecedores = new HashMap<Integer, Fornecedor>();fornecedores.put(1, new Fornecedor(1, "Bolha Peixes"));fornecedores.put(2, new Fornecedor(1, "Lui Bebidas"));
Agora:
final Map<Integer, Fornecedor> fornecedoresGoogle = Maps.newHashMap();fornecedoresGoogle.put(1, new Fornecedor(1, "Bolha Peixes"));fornecedoresGoogle.put(2, new Fornecedor(1, "Lui Bebidas"));
Google CollectionsGoogle CollectionsAntes:
Map<Integer, String> imutableMapAntigo;
final Map<Integer, String> mapAntigo = new HashMap<Integer, String>();mapAntigo.put(1, "Bolha");mapAntigo.put(2, "Wende");
imutableMapAntigo = Collections.unmodifiableMap(mapAntigo);
Agora:
ImmutableMap<Integer, String> immutableMap = ImmutableMap.of(1, "Bolha", 2, "Wende");
Google CollectionsGoogle Collections
Set
Google CollectionsGoogle Collections
- HashSet;
- LinkedHashSet;
- TreeSet;
- ImmutableSet
Google CollectionsGoogle Collections
Antes:
final Set<String> dias = new HashSet<String>();dias.add("Segunda");dias.add("Terça");
Ou:
final Set<String> dias = new HashSet<String>(Arrays.asList("Segunda", "Terça");
Agora:
final Set<String> dias = Sets.newHashSet("Segunda", "Terça");
Console:Terça, Segunda ou Segunda, Terça
Google CollectionsGoogle Collections
Antes:
final Set<String> dias = new LinkedHashSet<String>();dias.add("Segunda");dias.add("Terça");dias.add("Quarta");
Agora:
final Set<String> dias = Sets.newLinkedHashSet();dias.add("Segunda");dias.add("Terça");dias.add("Quarta");
Console:Segunda, Terça, Quarta
Google CollectionsGoogle Collections
Antes:
final Set<String> dias = new TreeSet<String>();dias.add("Segunda");dias.add("Terça");dias.add("Quarta");
Agora:
final Set<String> dias = Sets.newTreeSet();dias.add("Segunda");dias.add("Terça");dias.add("Quarta");
Console:Quarta, Segunda, Terça
Google CollectionsGoogle CollectionsAntes:Set<String> setAntigo = new HashSet<String>();setAntigo.add("Bolha");setAntigo.add("Wende");
Collection<String> imutableSetAntigo = Collections.unmodifiableCollection(setAntigo);
Agora:
ImmutableSet<String> immutableSet = ImmutableSet.of("Lui", "Bolha");
Google CollectionsGoogle Collections
MultimapsMultimaps
Google CollectionsGoogle Collections
Antes:
final Map<Integer, List<Fornecedor>> map = new HashMap<Integer, List<Fornecedor>>();
public void popular(final Integer fornecedorKey, final Fornecedor fornecedor) {List<Fornecedor> fornecedores = map.get(fornecedorKey); if (fornecedores == null) { fornecedores = new ArrayList<Fornecedor>(); map.put(fornecedorKey, fornecedores);} fornecedores.add(fornecedor);
}
Google CollectionsGoogle CollectionsAgora:
- ArrayListMultimap;
- LinkedListMultimap;
- TreeMultimap;
- HashMultimap;
- LinkedHashMultimap;
- ImmutableListMultimap
- ImmutableSetMultimap
Google CollectionsGoogle CollectionsAgora:
final Multimap<Integer, Fornecedor> multimap = ArrayListMultimap.create();
public void popular(final Integer fornecedorKey, final Fornecedor fornecedor) {multimap.put(fornecedorKey, fornecedor);
}
Google CollectionsGoogle Collections
final Multimap<Integer, Fornecedor> multimap = ArrayListMultimap.create();
multimap.put(1, "Lui");multimap.put(2, "Wende");multimap.put(2, "Wende");multimap.put(2, "Wende");multimap.put(1, "Andre");multimap.put(2, "Bolha");
Console:1 = {Lui, André}2 = {Wende, Wende, Wende, Bolha}
Google CollectionsGoogle Collections
final Multimap<Integer, String> multimap = HashMultimap.create();multimap.put(1, "Lui");multimap.put(2, "Bolha");multimap.put(2, "Wende");multimap.put(2, "Wende");multimap.put(2, "Wende");multimap.put(1, "Andre");
Console:1 = {André, Lui}2 = {Wende, Bolha}
Google CollectionsGoogle Collections
final Multimap<Integer, String> multimap = LinkedHashMultimap.create();multimap.put(1, "Lui");multimap.put(2, "Bolha");multimap.put(2, "Wende");multimap.put(2, "Wende");multimap.put(2, "Wende");multimap.put(1, "Andre");
Console:1 = {Lui, André}2 = {Bolha, Wende}
Google CollectionsGoogle Collections
final Multimap<Integer, String> multimap = TreeMultimap.create();multimap.put(1, "Lui");multimap.put(2, "Bolha");multimap.put(2, "Wende");multimap.put(2, "Wende");multimap.put(2, "Wende");multimap.put(1, "Andre");
Console:1 = {André, Lui}2 = {Bolha, Wende}
Google CollectionsGoogle CollectionsAgora:
Multimap<Integer, String> multimap = ImmutableListMultimap.of(1, "Lui", 2, "Wende", 1, "China", 1, "Lui");
Console: 1 = { Lui, China, Lui } 2 = { Wende }
Google CollectionsGoogle CollectionsAgora:
Multimap<Integer, String> multimap = ImmutableSetMultimap.of(1, "Lui", 2, "Wende", 1, "China", 1, "Lui");
Console: 1 = { Lui, China} 2 = { Wende }
Google CollectionsGoogle Collections
MultisetsMultisets
Google CollectionsGoogle Collections
- HashMultiset - LinkedHashMultiset
- TreeMultiset
- EnumMultiset
Google CollectionsGoogle CollectionsAgora:
Multiset<String> nomes = HashMultiset.create();nomes.add("Wende");nomes.add("China", 3);nomes.add("Bolha");
Google CollectionsGoogle Collections
for (final String nome : nomes) {System.out.println(nome);
}
O que será impresso ???
Google CollectionsGoogle Collections
Console:
Wende, Bolha, China, China, China
Google CollectionsGoogle Collections
System.out.println(nomes.elementSet());Console:
Wende, Bolha, China
System.out.println(nomes.count("China"));Console:
3
System.out.println(nomes.size());Console:
5
Google CollectionsGoogle Collectionsenum Fornecedor {
BolhaPeixes, DouglasCafe}
final EnumMultiset<Fornecedor> fornecedores = EnumMultiset.create(Fornecedor.class);
fornecedores.add(Fornecedor.BolhaPeixes);fornecedores.add(Fornecedor.BolhaPeixes);fornecedores.add(Fornecedor.BolhaPeixes);fornecedores.add(Fornecedor.DouglasCafe);
System.out.println(fornecedores.elementSet());
Console:BolhaPeixes, DouglasCafe
Google CollectionsGoogle Collections
Também tenho estas opções:
final Multiset<String> nomes = LinkedHashMultiset.create();
final Multiset<String> nomes = TreeMultiset.create();
ImagensImagens
http://www.flickr.com/photos/dannysullivan/272645770/http://www.flickr.com/photos/northbaywanderer/121971249/http://www.fl ickr.com/photos/colm/551068416/http://www.fl ickr.com/photos/vermininc/2335148856/http://www.fl ickr.com/photos/caveman_92223/3185534518/http://www.fl ickr.com/photos/fdecomite/2908653728/
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