collections
TRANSCRIPT
Java.util and collection APII. Java util package.I.1. introduct
- c cha cc lp collection hu ch cho lm vic vi 1 nhm i tng. - N cng cha cc class nh ngha m cung cp ngy gi v nhiu tnh nng khc nh l tnh ton , t in. - N cng cha mt danh sch cc class v interface qun l tp d liu trn b nh.I.2. Collection Framework
- Mt collection l mt thng cha m h tr mt nhm nhiu thnh phn vo trong mt n v n. Collection tr gip lu tr, ly v thao tc d liu. - Trong java Collection Framwork cung cp mt tp interface v class cho vic lu tr v thao tc vi nhm i tng theo phng thc chun. - Collection Framwork pht trin vi mc tiu: Hight performance Interoperability (tng tc) M rng I.2.1. Collection Interface
- Cc lp con ca giao din collection: Set List Translate by [email protected] Page 1
Queue - Nhng lp collection l nhng lp chun m n thc thi giao din collection. Mt vi class thc hin y cc phng thc ca giao din trong khi mt vi class ch thc hin phn khung v c gi l lp tru tng. mt vi class l : HashSet LinkedHashSet TreeSet * ch : Map v SortedMap khng k tha t giao din collection I.2.2. mt s phng thc ca Collection Interface. Add(E obj) Contains(object obj) isEmpty() size() II. List Class and interfaceII.1. Giao din List
- Giao din List k tha t giao din collection - N cho php cc i tng trng lp c thm vo danh sch. - Cho php ngi lp trnh lm vic vi mt phn ca danh sch. - C cc phng thc cho php truy cp vo thnh phn da trn v tr, tm thnh phn ch nh v tr v v tr.II.2. ArrayList Class
- N thc thi giao din List trong Collection Framework - ArrayList ph hp vi truy cp ngu nhin m khng cn chn hoc xa thnh phn. - Contructor: ArrayList(): to mt danh sch rng, khi to danh sch lu tr 10 gi tr v c th m rng thm khi full.
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ArrayList(Collection