Java\u306e\u5185\u90e8\u30af\u30e9\u30b9\u306f\u3001\u4ed6\u306e\u30af\u30e9\u30b9\u306e\u672c\u4f53\u306e\u4e2d\u306b\u5b9a\u7fa9\u3055\u308c\u307e\u3059\u3002Java\u306e\u5185\u90e8\u30af\u30e9\u30b9\u306f\u3001private\u3001public\u3001protected\u3001\u307e\u305f\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30a2\u30af\u30bb\u30b9\u3067\u5ba3\u8a00\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u5916\u90e8\u30af\u30e9\u30b9\u306fpublic\u307e\u305f\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30a2\u30af\u30bb\u30b9\u3057\u304b\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002Java\u306e\u30cd\u30b9\u30c8\u3057\u305f\u30af\u30e9\u30b9\u306f\u30012\u3064\u306e\u30bf\u30a4\u30d7\u306b\u5206\u3051\u3089\u308c\u307e\u3059\u3002<\/p>\n
<\/p>\n
<\/p>\n
<\/p>\n
Java\u306e\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9
\n\u975e\u9759\u7684\u306a\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30af\u30e9\u30b9\u306fJava\u3067\u306f\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9\u3068\u547c\u3070\u308c\u307e\u3059\u3002Java\u306e\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9\u306f\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u3066\u304a\u308a\u3001\u5916\u90e8\u30af\u30e9\u30b9\u306e\u3059\u3079\u3066\u306e\u5909\u6570\u3068\u30e1\u30bd\u30c3\u30c9\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059\u3002\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306b\u95a2\u9023\u4ed8\u3051\u3089\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u305d\u308c\u3089\u306b\u9759\u7684\u306a\u5909\u6570\u306f\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002Java\u306e\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u5916\u90e8\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e00\u90e8\u3067\u3042\u308a\u3001\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u306b\u306f\u3001\u307e\u305a\u5916\u90e8\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002Java\u306e\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9\u306f\u6b21\u306e\u3088\u3046\u306b\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\nOuterClass outerObject = new OuterClass();
\nOuterClass.InnerClass innerObject = outerObject.new InnerClass();<\/p>\n
Java\u306b\u306f2\u3064\u306e\u7279\u5225\u306a\u7a2e\u985e\u306e\u5185\u90e8\u30af\u30e9\u30b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
<\/p>\n
\u30d1\u30c3\u30b1\u30fc\u30b8com.scdev.innerclasses;<\/p>\n
public\u30af\u30e9\u30b9MainClass {<\/p>\n
private String s_main_class;<\/p>\n
public void print() {
\nString s_print_method = “”;
\n\/\/ \u30e1\u30bd\u30c3\u30c9\u5185\u306e\u30ed\u30fc\u30ab\u30eb\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9
\nclass Logger {
\n\/\/ \u5305\u62ec\u30af\u30e9\u30b9\u306e\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b
\nString name = s_main_class;
\n\/\/ \u975efinal\u306e\u30e1\u30bd\u30c3\u30c9\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b
\nString name1 = s_print_method;<\/p>\n
public void foo() {
\nString name1 = s_print_method;
\n\/\/ \u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\uff1a
\n\/\/ \u72b6\u6cc1\u306b\u3088\u3063\u3066\u306f\u3001\u8fd1\u304f\u306e\u30b9\u30b3\u30fc\u30d7\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u30ed\u30fc\u30ab\u30eb\u5909\u6570s_print_method\u306ffinal\u307e\u305f\u306f\u52b9\u679c\u7684\u306bfinal\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059
\n\/\/ s_print_method= “:”;
\n}
\n}
\n\/\/ \u30e1\u30bd\u30c3\u30c9\u5185\u3067\u30ed\u30fc\u30ab\u30eb\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9\u3092\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3057\u3066\u4f7f\u7528\u3059\u308b
\nLogger logger = new Logger();<\/p>\n
}
\n}<\/p>\n
\u30d6\u30ed\u30c3\u30af\u5185\u306b\u3082\u30ed\u30fc\u30ab\u30eb\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001static\u30d6\u30ed\u30c3\u30af\u3001if-else\u30d6\u30ed\u30c3\u30af\u306a\u3069\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u3053\u306e\u5834\u5408\u3001\u30af\u30e9\u30b9\u306e\u30b9\u30b3\u30fc\u30d7\u306f\u975e\u5e38\u306b\u9650\u3089\u308c\u307e\u3059\u3002
\npublic\u30af\u30e9\u30b9MainClass {<\/p>\n
static {
\nclass Foo {<\/p>\n
}
\nFoo f = new Foo();
\n}<\/p>\n
public void bar() {
\nif(1 < 2) {
\nclass Test {<\/p>\n
}
\nTest t1 = new Test();
\n}
\n\/\/ \u30af\u30e9\u30b9\u306e\u30b9\u30b3\u30fc\u30d7\u306e\u305f\u3081\u3001\u4ee5\u4e0b\u306f\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059
\n\/\/ Test t = new Test();
\n\/\/ Foo f = new Foo();
\n}
\n}<\/p>\n
\u533f\u540d\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9
\n\u540d\u524d\u306e\u306a\u3044\u30ed\u30fc\u30ab\u30eb\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9\u306f\u533f\u540d\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9\u3068\u3057\u3066\u77e5\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u533f\u540d\u30af\u30e9\u30b9\u306f\u5b9a\u7fa9\u3068\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u30921\u3064\u306e\u6587\u3067\u884c\u3044\u307e\u3059\u3002\u533f\u540d\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9\u306f\u5e38\u306b\u30af\u30e9\u30b9\u3092\u62e1\u5f35\u3059\u308b\u304b\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002\u533f\u540d\u30af\u30e9\u30b9\u306b\u306f\u540d\u524d\u304c\u306a\u3044\u305f\u3081\u3001\u533f\u540d\u30af\u30e9\u30b9\u306e\u305f\u3081\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u533f\u540d\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9\u306f\u3001\u5b9a\u7fa9\u3055\u308c\u305f\u30dd\u30a4\u30f3\u30c8\u3067\u306e\u307f\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3067\u3059\u3002\u533f\u540d\u30a4\u30f3\u30ca\u30fc\u30af\u30e9\u30b9\u306e\u4f5c\u6210\u65b9\u6cd5\u3092\u5177\u4f53\u7684\u306a\u4f8b\u3067\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u4ee5\u4e0b\u306f\u3001Java\u306e\u5185\u90e8\u30af\u30e9\u30b9\u3001\u9759\u7684\u30cd\u30b9\u30c8\u30af\u30e9\u30b9\u3001\u30ed\u30fc\u30ab\u30eb\u5185\u90e8\u30af\u30e9\u30b9\u3001\u533f\u540d\u5185\u90e8\u30af\u30e9\u30b9\u3092\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u305fJava\u30af\u30e9\u30b9\u3067\u3059\u3002OuterClass.java<\/p>\n
package com.scdev.nested;\r\n\r\nimport java.io.File;\r\nimport java.io.FilenameFilter;\r\n\r\npublic class OuterClass {\r\n \r\n private static String name = \"OuterClass\";\r\n private int i;\r\n protected int j;\r\n int k;\r\n public int l;\r\n\r\n \/\/OuterClass constructor\r\n public OuterClass(int i, int j, int k, int l) {\r\n this.i = i;\r\n this.j = j;\r\n this.k = k;\r\n this.l = l;\r\n }\r\n\r\n public int getI() {\r\n return this.i;\r\n }\r\n\r\n \/\/static nested class, can access OuterClass static variables\/methods\r\n static class StaticNestedClass {\r\n private int a;\r\n protected int b;\r\n int c;\r\n public int d;\r\n\r\n public int getA() {\r\n return this.a;\r\n }\r\n\r\n public String getName() {\r\n return name;\r\n }\r\n }\r\n\r\n \/\/inner class, non-static and can access all the variables\/methods of the outer class\r\n class InnerClass {\r\n private int w;\r\n protected int x;\r\n int y;\r\n public int z;\r\n\r\n public int getW() {\r\n return this.w;\r\n }\r\n\r\n public void setValues() {\r\n this.w = i;\r\n this.x = j;\r\n this.y = k;\r\n this.z = l;\r\n }\r\n\r\n @Override\r\n public String toString() {\r\n return \"w=\" + w + \":x=\" + x + \":y=\" + y + \":z=\" + z;\r\n }\r\n\r\n public String getName() {\r\n return name;\r\n }\r\n }\r\n\r\n \/\/local inner class\r\n public void print(String initial) {\r\n \/\/local inner class inside the method\r\n class Logger {\r\n String name;\r\n\r\n public Logger(String name) {\r\n this.name = name;\r\n }\r\n\r\n public void log(String str) {\r\n System.out.println(this.name + \": \" + str);\r\n }\r\n }\r\n\r\n Logger logger = new Logger(initial);\r\n logger.log(name);\r\n logger.log(\"\" + this.i);\r\n logger.log(\"\" + this.j);\r\n logger.log(\"\" + this.k);\r\n logger.log(\"\" + this.l);\r\n }\r\n\r\n \/\/anonymous inner class\r\n public String[] getFilesInDir(String dir, final String ext) {\r\n File file = new File(dir);\r\n \/\/anonymous inner class implementing FilenameFilter interface\r\n String[] filesList = file.list(new FilenameFilter() {\r\n\r\n @Override\r\n public boolean accept(File dir, String name) {\r\n return name.endsWith(ext);\r\n }\r\n\r\n });\r\n return filesList;\r\n }\r\n}\r\n<\/code><\/pre>\n\u4ee5\u4e0b\u306f\u3001Java\u3067\u5185\u90e8\u30af\u30e9\u30b9\u3092\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3057\u3066\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3059\u30c6\u30b9\u30c8\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3059\u3002InnerClassTest.java\u3002<\/p>\n
package com.scdev.nested;\r\n\r\nimport java.util.Arrays;\r\n\/\/nested classes can be used in import for easy instantiation\r\nimport com.scdev.nested.OuterClass.InnerClass;\r\nimport com.scdev.nested.OuterClass.StaticNestedClass;\r\n\r\npublic class InnerClassTest {\r\n\r\n public static void main(String[] args) {\r\n OuterClass outer = new OuterClass(1,2,3,4);\r\n \r\n \/\/static nested classes example\r\n StaticNestedClass staticNestedClass = new StaticNestedClass();\r\n StaticNestedClass staticNestedClass1 = new StaticNestedClass();\r\n \r\n System.out.println(staticNestedClass.getName());\r\n staticNestedClass.d=10;\r\n System.out.println(staticNestedClass.d);\r\n System.out.println(staticNestedClass1.d);\r\n \r\n \/\/inner class example\r\n InnerClass innerClass = outer.new InnerClass();\r\n System.out.println(innerClass.getName());\r\n System.out.println(innerClass);\r\n innerClass.setValues();\r\n System.out.println(innerClass);\r\n \r\n \/\/calling method using local inner class\r\n outer.print(\"Outer\");\r\n \r\n \/\/calling method using anonymous inner class\r\n System.out.println(Arrays.toString(outer.getFilesInDir(\"src\/com\/scdev\/nested\", \".java\")));\r\n \r\n System.out.println(Arrays.toString(outer.getFilesInDir(\"bin\/com\/scdev\/nested\", \".class\")));\r\n }\r\n\r\n}\r\n<\/code><\/pre>\n\u4ee5\u4e0b\u306f\u3001\u4e0a\u8a18\u306eJava\u5185\u90e8\u30af\u30e9\u30b9\u306e\u4f8b\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u3067\u3059\u3002<\/p>\n
OuterClass\r\n10\r\n0\r\nOuterClass\r\nw=0:x=0:y=0:z=0\r\nw=1:x=2:y=3:z=4\r\nOuter: OuterClass\r\nOuter: 1\r\nOuter: 2\r\nOuter: 3\r\nOuter: 4\r\n[NestedClassTest.java, OuterClass.java]\r\n[NestedClassTest.class, OuterClass$1.class, OuterClass$1Logger.class, OuterClass$InnerClass.class, OuterClass$StaticNestedClass.class, OuterClass.class]\r\n<\/code><\/pre>\nOuterClass\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u308b\u3068\u3001\u5185\u90e8\u30af\u30e9\u30b9\u3001\u30ed\u30fc\u30ab\u30eb\u5185\u90e8\u30af\u30e9\u30b9\u3001\u304a\u3088\u3073\u9759\u7684\u30cd\u30b9\u30c8\u30af\u30e9\u30b9\u306e\u305f\u3081\u306b\u5225\u3005\u306e\u30af\u30e9\u30b9\u30d5\u30a1\u30a4\u30eb\u304c\u4f5c\u6210\u3055\u308c\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
Java\u5185\u90e8\u30af\u30e9\u30b9\u306e\u5229\u70b9<\/h3>\n\n- \n
\uff11\u3064\u306e\u30af\u30e9\u30b9\u306b\u306e\u307f\u6709\u7528\u306a\u5834\u5408\u3001\u305d\u306e\u30af\u30e9\u30b9\u3092\u30cd\u30b9\u30c8\u3057\u3066\u307e\u3068\u3081\u3066\u304a\u304f\u3053\u3068\u304c\u610f\u5473\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u306f\u30af\u30e9\u30b9\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u30f3\u30b0\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n <\/p>\n
\n- \n
Java\u306e\u5185\u90e8\u30af\u30e9\u30b9\u306f\u30ab\u30d7\u30bb\u30eb\u5316\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002\u5185\u90e8\u30af\u30e9\u30b9\u306f\u5916\u90e8\u30af\u30e9\u30b9\u306eprivate\u30e1\u30f3\u30d0\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u3068\u540c\u6642\u306b\u3001\u5916\u90e8\u306e\u4e16\u754c\u304b\u3089\u5185\u90e8\u30af\u30e9\u30b9\u3092\u96a0\u3059\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n <\/p>\n
\u5c0f\u3055\u306a\u30af\u30e9\u30b9\u3092\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u306e\u30af\u30e9\u30b9\u5185\u306b\u4fdd\u6301\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u304c\u4f7f\u7528\u3055\u308c\u308b\u5834\u6240\u306b\u8fd1\u304f\u306a\u308a\u3001\u30b3\u30fc\u30c9\u304c\u3088\u308a\u8aad\u307f\u3084\u3059\u304f\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/ol>\nJava\u306e\u5185\u90e8\u30af\u30e9\u30b9\u306b\u95a2\u3059\u308b\u8aac\u660e\u306f\u4ee5\u4e0a\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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