Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u3001static\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3057\u3070\u3057\u3070\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002Java\u306estatic\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001Java\u3067\u306e\u30af\u30e9\u30b9\u30ec\u30d9\u30eb\u306e\u5909\u6570\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002static\u5909\u6570\u3068\u30e1\u30bd\u30c3\u30c9\u306f\u30af\u30e9\u30b9\u306e\u4e00\u90e8\u3067\u3042\u308a\u3001\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u306f\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n
\u4ee5\u4e0b\u306e\u753b\u50cf\u3067\u793a\u3055\u308c\u3066\u3044\u308b\u3088\u3046\u306b\u3001Java\u306estatic\u30ad\u30fc\u30ef\u30fc\u30c9\u306f5\u3064\u306e\u30b1\u30fc\u30b9\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u305d\u306e\u3046\u3061\u306e4\u3064\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u304c\u30015\u3064\u76ee\u306e\u30b1\u30fc\u30b9\u306fJava 8\u3067\u5c0e\u5165\u3055\u308c\u3001Java 8\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5909\u66f4\u3067\u8b70\u8ad6\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
<\/p>\n
<\/p>\n
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Java\u306e\u9759\u7684\u30e1\u30bd\u30c3\u30c9
\n\u9759\u7684\u5909\u6570\u3068\u540c\u69d8\u306b\u3001\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u3082\u30af\u30e9\u30b9\u306b\u6240\u5c5e\u3057\u3001\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306b\u6240\u5c5e\u3057\u307e\u305b\u3093\u3002\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u306f\u30af\u30e9\u30b9\u306e\u9759\u7684\u5909\u6570\u306e\u307f\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3001\u30af\u30e9\u30b9\u306e\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u306e\u307f\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u901a\u5e38\u3001\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ed6\u306e\u30af\u30e9\u30b9\u304c\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u306a\u304f\u4f7f\u7528\u3067\u304d\u308b\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u3001Collections\u30af\u30e9\u30b9\u3084Java\u306eWrapper\u30af\u30e9\u30b9\u3001\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9\u306b\u306f\u591a\u304f\u306e\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002java\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u30dd\u30a4\u30f3\u30c8\u3067\u3042\u308bmain()\u30e1\u30bd\u30c3\u30c9\u81ea\u4f53\u3082\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002
\n\/\/\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u306e\u4f8b
\npublic static void setCount(int count) {
\nif(count > 0)
\nStaticExample.count = count;
\n}<\/p>\n
\/\/\u9759\u7684\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30e1\u30bd\u30c3\u30c9
\npublic static int addInts(int i, int…js){
\nint sum=i;
\nfor(int x : js) sum+=x;
\nreturn sum;
\n}<\/p>\n
Java 8\u4ee5\u964d\u3067\u306f\u3001\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u5185\u3067\u3082\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u3001Java 8\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5909\u66f4\u3092\u304a\u8aad\u307f\u304f\u3060\u3055\u3044\u3002<\/p>\n
Java\u306e\u9759\u7684\u30d6\u30ed\u30c3\u30af
\nJava\u306e\u9759\u7684\u30d6\u30ed\u30c3\u30af\u306f\u3001Java\u306e\u30af\u30e9\u30b9\u30ed\u30fc\u30c0\u306b\u3088\u3063\u3066\u30af\u30e9\u30b9\u304c\u30e1\u30e2\u30ea\u306b\u30ed\u30fc\u30c9\u3055\u308c\u308b\u3068\u304d\u306b\u5b9f\u884c\u3055\u308c\u308b\u4e00\u9023\u306e\u6587\u3067\u3059\u3002\u9759\u7684\u30d6\u30ed\u30c3\u30af\u306f\u30af\u30e9\u30b9\u306e\u9759\u7684\u5909\u6570\u3092\u521d\u671f\u5316\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001\u30af\u30e9\u30b9\u304c\u30ed\u30fc\u30c9\u3055\u308c\u308b\u969b\u306b\u9759\u7684\u306a\u30ea\u30bd\u30fc\u30b9\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u9759\u7684\u30d6\u30ed\u30c3\u30af\u3067\u306f\u975e\u9759\u7684\u306a\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u30af\u30e9\u30b9\u5185\u306b\u8907\u6570\u306e\u9759\u7684\u30d6\u30ed\u30c3\u30af\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u3042\u307e\u308a\u610f\u5473\u3092\u6210\u3057\u307e\u305b\u3093\u3002\u9759\u7684\u30d6\u30ed\u30c3\u30af\u306e\u30b3\u30fc\u30c9\u306f\u3001\u30af\u30e9\u30b9\u304c\u30e1\u30e2\u30ea\u306b\u30ed\u30fc\u30c9\u3055\u308c\u308b\u3068\u304d\u306b\u4e00\u5ea6\u3060\u3051\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002
\nstatic{
\n\/\/\u30af\u30e9\u30b9\u304c\u30ed\u30fc\u30c9\u3055\u308c\u308b\u969b\u306b\u30ea\u30bd\u30fc\u30b9\u306e\u521d\u671f\u5316\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059
\nSystem.out.println(“StaticExample\u306e\u9759\u7684\u30d6\u30ed\u30c3\u30af”);
\n\/\/\u9759\u7684\u306a\u5909\u6570\u3068\u30e1\u30bd\u30c3\u30c9\u306b\u306e\u307f\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059
\nstr=”Test”;
\nsetCount(2);
\n}<\/p>\n
Java\u306e\u9759\u7684\u30af\u30e9\u30b9
\n\u30cd\u30b9\u30c8\u3057\u305f\u30af\u30e9\u30b9\u306b\u306fstatic\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u306e\u30af\u30e9\u30b9\u306b\u306f\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002\u9759\u7684\u306a\u30cd\u30b9\u30c8\u30af\u30e9\u30b9\u306f\u4ed6\u306e\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u30af\u30e9\u30b9\u3068\u540c\u3058\u3067\u3042\u308a\u3001\u5358\u306b\u30d1\u30c3\u30b1\u30fc\u30b8\u30f3\u30b0\u306e\u4fbf\u5b9c\u4e0a\u30cd\u30b9\u30c8\u3057\u3066\u3044\u308b\u3060\u3051\u3067\u3059\u3002\u8a73\u7d30\u306f: Java Nested Classes \u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4e2d\u3067\u3001Java\u306estatic\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4f7f\u7528\u65b9\u6cd5\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002StaticExample.java<\/p>\n
package com.scdev.misc;\r\n\r\npublic class StaticExample {\r\n\r\n \/\/static block\r\n static{\r\n \/\/can be used to initialize resources when class is loaded\r\n System.out.println(\"StaticExample static block\");\r\n \/\/can access only static variables and methods\r\n str=\"Test\";\r\n setCount(2);\r\n }\r\n \r\n \/\/multiple static blocks in same class\r\n static{\r\n System.out.println(\"StaticExample static block2\");\r\n }\r\n \r\n \/\/static variable example\r\n private static int count; \/\/kept private to control its value through setter\r\n public static String str;\r\n \r\n public int getCount() {\r\n return count;\r\n }\r\n\r\n \/\/static method example\r\n public static void setCount(int count) {\r\n if(count > 0)\r\n StaticExample.count = count;\r\n }\r\n \r\n \/\/static util method\r\n public static int addInts(int i, int...js){\r\n int sum=i;\r\n for(int x : js) sum+=x;\r\n return sum;\r\n }\r\n\r\n \/\/static class example - used for packaging convenience only\r\n public static class MyStaticClass{\r\n public int count;\r\n \r\n }\r\n\r\n}\r\n<\/code><\/pre>\n\u30c6\u30b9\u30c8\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3001\u9759\u7684\u5909\u6570\u3001\u30e1\u30bd\u30c3\u30c9\u3001\u9759\u7684\u30af\u30e9\u30b9\u306e\u4f7f\u3044\u65b9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002TestStatic.java<\/p>\n
package com.scdev.misc;\r\n\r\npublic class TestStatic {\r\n\r\n public static void main(String[] args) {\r\n StaticExample.setCount(5);\r\n \r\n \/\/non-private static variables can be accessed with class name\r\n StaticExample.str = \"abc\";\r\n StaticExample se = new StaticExample();\r\n System.out.println(se.getCount());\r\n \/\/class and instance static variables are same\r\n System.out.println(StaticExample.str +\" is same as \"+se.str);\r\n System.out.println(StaticExample.str == se.str);\r\n \r\n \/\/static nested classes are like normal top-level classes\r\n StaticExample.MyStaticClass myStaticClass = new StaticExample.MyStaticClass();\r\n myStaticClass.count=10;\r\n \r\n StaticExample.MyStaticClass myStaticClass1 = new StaticExample.MyStaticClass();\r\n myStaticClass1.count=20;\r\n \r\n System.out.println(myStaticClass.count);\r\n System.out.println(myStaticClass1.count);\r\n }\r\n \r\n}\r\n<\/code><\/pre>\n\u4e0a\u8a18\u306eJava\u306e\u9759\u7684\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4f8b\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
StaticExample static block\r\nStaticExample static block2\r\n5\r\nabc is same as abc\r\ntrue\r\n10\r\n20\r\n<\/code><\/pre>\n\u30af\u30e9\u30b9\u304c\u30e1\u30e2\u30ea\u306b\u8aad\u307f\u8fbc\u307e\u308c\u308b\u3068\u3001\u9759\u7684\u30d6\u30ed\u30c3\u30af\u30b3\u30fc\u30c9\u304c\u6700\u521d\u306b\u5b9f\u884c\u3055\u308c\u3001\u4e00\u5ea6\u3060\u3051\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u4ed6\u306e\u51fa\u529b\u306f\u3001\u81ea\u5df1\u8aac\u660e\u7684\u3067\u3059\u3002<\/p>\n
Java\u306e\u9759\u7684\u30a4\u30f3\u30dd\u30fc\u30c8<\/h3>\n
\u901a\u5e38\u3001\u30af\u30e9\u30b9\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u3092\u4f7f\u7528\u3057\u3066\u9759\u7684\u30e1\u30f3\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3057\u307e\u3059\u304c\u3001Java 1.5\u304b\u3089\u306f\u30af\u30e9\u30b9\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u3092\u907f\u3051\u308b\u305f\u3081\u306bJava\u306e\u9759\u7684\u30a4\u30f3\u30dd\u30fc\u30c8\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306bJava\u9759\u7684\u30a4\u30f3\u30dd\u30fc\u30c8\u306e\u7c21\u5358\u306a\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n
package com.scdev.test;\r\n\r\npublic class A {\r\n\r\n\tpublic static int MAX = 1000;\r\n\t\r\n\tpublic static void foo(){\r\n\t\tSystem.out.println(\"foo static method\");\r\n\t}\r\n}\r\n<\/code><\/pre>\npackage com.scdev.test;\r\n\r\nimport static com.scdev.test.A.MAX;\r\nimport static com.scdev.test.A.foo;\r\n\r\npublic class B {\r\n\r\n\tpublic static void main(String args[]){\r\n\t\tSystem.out.println(MAX); \/\/normally A.MAX\r\n\t\tfoo(); \/\/ normally A.foo()\r\n\t}\r\n}\r\n<\/code><\/pre>\n\u4ee5\u4e0b\u306e\u901a\u308a\u3001\u65e5\u672c\u8a9e\u3067\u306e\u8868\u73fe\u3092\u4e00\u3064\u63d0\u793a\u3057\u307e\u3059\uff1a<\/p>\n
\u30a4\u30f3\u30dd\u30fc\u30c8\u6587\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u30a4\u30f3\u30dd\u30fc\u30c8\u306e\u5834\u5408\u306f\u3001import static\u306b\u7d9a\u3051\u3066\u30af\u30e9\u30b9\u306e\u5b8c\u5168\u4fee\u98fe\u3055\u308c\u305f\u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u30e1\u30f3\u30d0\u30fc\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30af\u30e9\u30b9\u306e\u3059\u3079\u3066\u306e\u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u30e1\u30f3\u30d0\u30fc\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u5834\u5408\u306f\u3001import static com.scdev.test.A.*;\u306e\u3088\u3046\u306b*\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30af\u30e9\u30b9\u306e\u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u5909\u6570\u3092\u8907\u6570\u56de\u4f7f\u7528\u3059\u308b\u5834\u5408\u306b\u306e\u307f\u4f7f\u7528\u3059\u308b\u3079\u304d\u3067\u3042\u308a\u3001\u53ef\u8aad\u6027\u306b\u306f\u3042\u307e\u308a\u826f\u304f\u3042\u308a\u307e\u305b\u3093\u3002\u66f4\u65b0\u60c5\u5831\uff1a\u6700\u8fd1\u3001Java\u306estatic\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u3064\u3044\u3066\u8aac\u660e\u3059\u308b\u305f\u3081\u306e\u30d3\u30c7\u30aa\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f\u3002\u4ee5\u4e0b\u306e\u30ea\u30f3\u30af\u304b\u3089\u3054\u89a7\u304f\u3060\u3055\u3044\u3002https:\/\/www.youtube.com\/watch?v=2e-l1vb\\_fwM<\/p>\n","protected":false},"excerpt":{"rendered":"
Java\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u3001static\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3057\u3070\u3057\u3070\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002Java\u306estatic\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001Java\u3067\u306e\u30af\u30e9\u30b9\u30ec\u30d9\u30eb\u306e\u5909\u6570\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002static\u5909\u6570\u3068\u30e1\u30bd\u30c3\u30c9\u306f\u30af\u30e9\u30b9\u306e\u4e00\u90e8\u3067\u3042\u308a […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-283","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\n
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