{"id":170,"date":"2008-06-16T11:05:00","date_gmt":"2008-06-16T11:05:00","guid":{"rendered":"http:\/\/www.tutego.de\/blog\/javainsel\/?p=170"},"modified":"2008-06-16T11:05:00","modified_gmt":"2008-06-16T11:05:00","slug":"thema-der-woche-collection-api","status":"publish","type":"post","link":"https:\/\/www.tutego.de\/blog\/javainsel\/2008\/06\/thema-der-woche-collection-api\/","title":{"rendered":"Thema der Woche: Collection-API"},"content":{"rendered":"<p>Die Collection-API enth&#228;lt grundlegende Sammlungen f&#252;r Listen, Kellerspeicher, Assoziativspeicher. Gehe &#252;ber alle Operationen der folgenden Schnittstellen:<\/p>\n<ul>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Collection.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Collection.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Collection.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/List.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/List.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/List.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Queue.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Queue.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Queue.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Set.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Set.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Set.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Map.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Map.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Map.html<\/a><\/li>\n<\/ul>\n<p>Finde je ein Beispiel f&#252;r keySet(), retainAll(), toArray(), headSet().<\/p>\n<p>Welche Implementierungseigenschaften haben die folgenden Klassen:<\/p>\n<ul>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/HashSet.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/HashSet.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/HashSet.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/TreeSet.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/TreeSet.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/TreeSet.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/ArrayList.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/ArrayList.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/ArrayList.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/LinkedList.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/LinkedList.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/LinkedList.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/PriorityBlockingQueue.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/PriorityBlockingQueue.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/PriorityBlockingQueue.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/ConcurrentLinkedQueue.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/ConcurrentLinkedQueue.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/ConcurrentLinkedQueue.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/CopyOnWriteArraySet.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/CopyOnWriteArraySet.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/CopyOnWriteArraySet.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/CopyOnWriteArrayList.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/CopyOnWriteArrayList.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/CopyOnWriteArrayList.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/ConcurrentSkipListSet.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/ConcurrentSkipListSet.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/ConcurrentSkipListSet.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/EnumMap.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/EnumMap.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/EnumMap.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/HashMap.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/HashMap.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/HashMap.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/IdentityHashMap.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/IdentityHashMap.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/IdentityHashMap.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/LinkedHashMap.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/LinkedHashMap.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/LinkedHashMap.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/ConcurrentHashMap.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/ConcurrentHashMap.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/ConcurrentHashMap.html<\/a><\/li>\n<li><a title=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/WeakHashMap.html\" href=\"http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/WeakHashMap.html\">http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/WeakHashMap.html<\/a><\/li>\n<\/ul>\n<p>F&#252;lle eine WeakHashMap mit sovielen neuen java.awt.Point-Objekten, bis es einen OutOfMemoryError gibt. Fange diesen ab und gib die Gr&#246;&#223;e der WeakHashMap aus.<\/p>\n<p>Laufe zum Verst&#228;ndnis der Implementierung folgende Szenerien im Debugger ab:<\/p>\n<ul>\n<li>Ein Element wird in die HashMap eingef&#252;gt, dann erfragt.<\/li>\n<li>In eine LinkedList bzw. ArrayList werden einige Elemente eingef&#252;gt, dann nach ihrer Position erfragt und gel&#246;scht.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Die Collection-API enth&#228;lt grundlegende Sammlungen f&#252;r Listen, Kellerspeicher, Assoziativspeicher. Gehe &#252;ber alle Operationen der folgenden Schnittstellen: http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Collection.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/List.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Queue.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Set.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/Map.html Finde je ein Beispiel f&#252;r keySet(), retainAll(), toArray(), headSet(). Welche Implementierungseigenschaften haben die folgenden Klassen: http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/HashSet.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/TreeSet.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/ArrayList.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/LinkedList.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/PriorityBlockingQueue.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/ConcurrentLinkedQueue.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/CopyOnWriteArraySet.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/CopyOnWriteArrayList.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/ConcurrentSkipListSet.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/EnumMap.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/HashMap.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/IdentityHashMap.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/LinkedHashMap.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/concurrent\/ConcurrentHashMap.html http:\/\/java.sun.com\/javase\/6\/docs\/api\/java\/util\/WeakHashMap.html F&#252;lle eine WeakHashMap mit [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[13],"tags":[],"class_list":["post-170","post","type-post","status-publish","format-standard","hentry","category-die-wochentliche-dosis-java"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/posts\/170","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/comments?post=170"}],"version-history":[{"count":0,"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/posts\/170\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/media?parent=170"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/categories?post=170"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tutego.de\/blog\/javainsel\/wp-json\/wp\/v2\/tags?post=170"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}