{"id":505,"date":"2004-03-11T16:00:00","date_gmt":"2004-03-11T07:00:00","guid":{"rendered":"\/?p=505"},"modified":"2004-03-11T16:00:00","modified_gmt":"2004-03-11T07:00:00","slug":"java2-sdk-15-tiger-generic-types","status":"publish","type":"post","link":"https:\/\/www.hiro345.net\/blogs\/hiro345\/archives\/505.html","title":{"rendered":"Java2 SDK 1.5 (Tiger) [Generic Types]"},"content":{"rendered":"

\nRef: J2SE 1.5 in a Nutshell<\/a>\n<\/p>\n

\nJ2SE 1.5 (Tiger) download<\/a> \u304b\u3089 J2SE 1.5 \u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u3066\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3088\u3046\u3002\u4e3b\u8981\u306a\u5909\u66f4\u70b9\u3092\u8a66\u3059\u306e\u306b\u5fd8\u308c\u3066\u306f\u3044\u3051\u306a\u3044\u306e\u306f\u3001javac \u30b3\u30de\u30f3\u30c9\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u3068\u304d\u306b -source 1.5 \u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3060\u3051\u3060\u3002\n<\/p>\n

javac -source 1.5 GenericTest.java<\/div>\n<\/p>\n

\nNutshell\u3067\u7d39\u4ecb\u3055\u308c\u3066\u3044\u308b\u306e\u306f\u3001\u6b21\u306e\u5185\u5bb9\u3060\u3002
\n\u30fbMetadata
\n\u30fbGeneric Types
\n\u30fbAutoboxing and Auto-unboxing of Primitive Types
\n\u30fbEnhanced for loop
\n\u30fbEnumerated types
\n\u30fbStatic Import
\n\u30fbFormatted Output
\n\u30fbFormatted Input
\n\u30fbVarargs
\n\u30fbConcurrency Utilities
\n\u30fbrmic — the rmi Compiler
\n\u30fbConcurrency Utilities
\n\u30fbScalability and Performance
\n\u30fbMonitoring and Manageability
\n\u30fbNew JVM profiling API (JSR-163)
\n\u30fbImproved Diagnostic Ability
\n\u30fbDesktop Client\n<\/p>\n

\n\u305d\u306e\u4ed6
\n\u30fbCore XML Support
\n\u30fbSupplementary Character Support
\n\u30fbJDBC RowSets\n<\/p>\n

\n\u3055\u3063\u305d\u304f\u3001\u4f8b\u3092\u307f\u3066\u307f\u3088\u3046\u3002\n<\/p>\n

<\/p>\n

Generic Types<\/h2>\n

\n\u307e\u305a\u306f\u3001Generic Types \u306b\u3064\u3044\u3066\u898b\u3066\u307f\u3088\u3046\u3002\u5f93\u6765\u306eCollections API \u3067\u306f\u3001\u96c6\u5408\u306e\u8981\u7d20\u306f\u3059\u3079\u3066Object\u578b\u3067\u3042\u308b\u3053\u3068\u3092\u524d\u63d0\u3068\u3057\u3066\u8a2d\u8a08\u3055\u308c\u3066\u3044\u305f\u306e\u3067\u3001Collection\u306e\u8981\u7d20\u306b\u5bfe\u3059\u308b\u578b\u30c1\u30a7\u30c3\u30af\u3092\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u5b9f\u8cea\u7684\u306b\u3067\u304d\u306a\u304b\u3063\u305f\u3002\u578b\u30c1\u30a7\u30c3\u30af\u3084\u30ad\u30e3\u30b9\u30c8\u306b\u3088\u308b\u8abf\u6574\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30de\u306e\u4ed5\u4e8b\u306b\u306a\u3063\u3066\u3044\u305f\u3002\u3053\u308c\u3092\u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u3084\u3089\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u8a00\u8a9e\u304c\u62e1\u5f35\u3055\u308c\u305f\u3002\u3044\u308f\u3086\u308bC++\u3067\u3044\u3046\u3068\u3053\u308d\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u6a5f\u80fd\u3060\u3002\n<\/p>\n

import java.util.ArrayList;
\npublic class GenericTest {
\n public static void main(String[] args) {
\n\t\/\/ version 1.4 code
\n\tArrayList list = new ArrayList();
\n\tlist.add(0, new Integer(12));
\n\tint total = ((Integer)list.get(0)).intValue();
\n\tSystem.out.println(“list.get(0) :”+total);<\/p>\n

\t\/\/ version 1.5 code
\n\tArrayList genericList = new ArrayList();
\n\tgenericList.add(0, new Integer(20));
\n\ttotal = genericList.get(0).intValue(); \/\/ \u30ad\u30e3\u30b9\u30c8\u306e\u5fc5\u8981\u306a\u3044
\n\tSystem.out.println(“genericList.get(0):”+total);
\n }
\n}<\/div>\n

\n\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u3068\u304d\u306b\u306f\u3001version 1.4 \u306e\u65b9\u3067\u306f warning \u304c\u51fa\u529b\u3055\u308c\u308b\u3002\u3069\u3093\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u51fa\u529b\u3055\u308c\u308b\u304b\u3082\u898b\u308b\u305f\u3081\u306b\u3001\u8a73\u7d30\u8868\u793a\u3067\u304d\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u6307\u5b9a\u3057\u3066\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u307f\u3088\u3046\u3002<\/p>\n

javac -source 1.5 -Xlint:unchecked GenericTest.java<\/div>\n

\n\u5b9f\u884c\u3059\u308b\u306b\u306f\u3001\u666e\u901a\u306b java \u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u3048\u3070\u3044\u3044\u3002\u3061\u306a\u307f\u306b\u3001Java2 1.4 \u3067\u306f Generic type \u3092\u4f7f\u3063\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3055\u305b\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u3088\u3046\u3060\u3002Beta1 \u3067\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b -source 1.5 \u3092\u6307\u5b9a\u3059\u308b\u3068\u3001-target \u30aa\u30d7\u30b7\u30e7\u30f3\u3067 1.4 \u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u3002\n<\/p>\n

$ java GenericTest
\nlist.get(0) :12
\ngenericList.get(0):20<\/div>\n

Autoboxing and Auto-unboxing of Primitive Types<\/h2>\n

\nGeneric Types \u306e\u3068\u3053\u308d\u3067\u51fa\u3066\u304d\u305f\u304c\u3001\u3053\u308c\u307e\u3067\u306f\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u5909\u6570\u3078\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u76f4\u63a5\u4ee3\u5165\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u304b\u3063\u305f\u3057\u3001\u53c2\u7167\u578b\u5909\u6570\u3078\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306e\u5024\u3092\u4ee3\u5165\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u304b\u3063\u305f\u3002genericList.add(0, new Integer(20)); \u3084, int total = genericList.get(0).intValue(); \u306f\u826f\u3044\u4f8b\u3060\u30021.5\u304b\u3089\u306f\u3001\u3053\u308c\u3089\u306e\u4ee3\u5165\u304c\u7c21\u5358\u306b\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3002\n<\/p>\n

import java.util.ArrayList;
\npublic class AutoboxingTest {
\n public static void main(String[] args) {
\n\t\/\/ version 1.5 code
\n\tArrayList genericList = new ArrayList();
\n\tgenericList.add(0, 20); \/\/ int \u304b\u3089 Integer\u3078\u306f\u81ea\u52d5\u5909\u63db
\n\tint total = genericList.get(0); \/\/ Integer\u304b\u3089int\u3078\u306f\u81ea\u52d5\u5909\u63db
\n\tSystem.out.println(“genericList.get(0):”+total);
\n }
\n}<\/div>\n

\n\u5b9f\u884c\u306f\u7c21\u5358\u3002\u3053\u306e\u8a18\u8ff0\u304c\u3067\u304d\u308b\u3068\u3001\u30b3\u30fc\u30c9\u81ea\u4f53\u306f\u304b\u306a\u308a\u3059\u3063\u304d\u308a\u3059\u308b\u3002(\u3053\u308c\u3067\u3001\u521d\u5b66\u8005\u306b\u306f\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u3092\u6559\u3048\u306a\u304f\u3066\u3082\u3088\u304f\u306a\u308b\u306e\u304b\u306a\u3002\u305d\u3046\u3059\u308b\u3068\u3044\u308d\u3044\u308d\u3068\u521d\u671f\u306e\u8aac\u660e\u304c\u7d71\u4e00\u3057\u3066\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u306e\u3067\u5b09\u3057\u3044\u306e\u3060\u3051\u308c\u3069\u3002\u305d\u308c\u3068\u3082\u3001\u9006\u306b\u96e3\u3057\u304f\u611f\u3058\u308b\u3088\u3046\u306b\u306a\u308b\u3060\u308d\u3046\u304b)\n<\/p>\n

$ java AutoboxingTest
\ngenericList.get(0):20<\/div>\n

Enumerated types<\/h2>\n

\u53cd\u8986\u51e6\u7406\u3092\u3059\u308b\u3068\u304d\u306b\u3001java.util.Iterator \u3092\u4f7f\u3063\u3066\u3044\u305f\u5834\u5408\u304c\u7d50\u69cb\u3042\u308b\u3060\u308d\u3046\u304c\u3001\u3053\u308c\u306f\u6c7a\u307e\u308a\u304d\u3063\u305f\u51e6\u7406\u306b\u306a\u308b\u306e\u3067\u3001\u3082\u3063\u3068\u7c21\u5358\u306b\u4f7f\u3048\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306b\u3001\u7c21\u6613\u8a18\u8ff0\u304c\u63d0\u4f9b\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3002\n<\/p>\n

import java.util.ArrayList;
\nimport java.util.Iterator;
\npublic class EnhancedForLoopTest {
\n public static void main(String[] args) {
\n\tArrayList list = new ArrayList();
\n\tlist.add(20);
\n\tlist.add(40);
\n\tlist.add(60);<\/p>\n

\/\/ Iterator
\n\tfor (Iterator i = list.iterator(); i.hasNext();) {
\n\t Integer value = (Integer)i.next();
\n\t System.out.println(value);
\n\t}<\/p>\n

\/\/ Enhanced for loop
\n \/\/ \u53d6\u6271\u3046\u96c6\u5408\u306f list, \u8981\u7d20\u306f Integer\u578b\u3067 i\u3067\u53c2\u7167
\n\tfor (Integer i : list) {
\n\t System.out.println(i);
\n\t}
\n }
\n}<\/p><\/div>\n

\n\u3053\u308c\u3082\u5b9f\u884c\u306f\u7c21\u5358\u3002\u898b\u6163\u308c\u308b\u307e\u3067\u3061\u3087\u3063\u3068\u9055\u548c\u611f\u304c\u3042\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u304c\u3001\u3069\u3093\u306a\u96c6\u5408\u306b\u5bfe\u3057\u3066\u53cd\u8986\u51e6\u7406\u3092\u3057\u3066\u3044\u308b\u306e\u304b\u7406\u89e3\u3059\u308b\u306e\u306b\u5fc5\u8981\u306a\u60c5\u5831\u304c\u4e00\u76ee\u3067\u308f\u304b\u308b\u306e\u3067\u3001\u7a4d\u6975\u7684\u306b\u4f7f\u3063\u3066\u884c\u304f\u3079\u304d\u3060\u308d\u3046\u3002\n<\/p>\n

$ java EnhancedForLoopTest
\n20
\n40
\n60
\n20
\n40
\n60<\/div>\n","protected":false},"excerpt":{"rendered":"

Ref: J2SE 1.5 in a Nutshell J2SE 1.5 (Tiger) download \u304b\u3089 J2SE 1.5 \u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u3066\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3088\u3046\u3002\u4e3b\u8981\u306a\u5909\u66f4\u70b9\u3092\u8a66\u3059\u306e\u306b\u5fd8\u308c\u3066\u306f\u3044\u3051\u306a\u3044\u306e\u306f\u3001jav … \u7d9a\u304d\u3092\u8aad\u3080 →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-505","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/posts\/505","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/comments?post=505"}],"version-history":[{"count":0,"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/posts\/505\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/media?parent=505"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/categories?post=505"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hiro345.net\/blogs\/hiro345\/wp-json\/wp\/v2\/tags?post=505"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}