. "Nulov\u00FD ukazatel"@cs . "Nullzeiger"@de . . . . . . "13539"^^ . "In computing, a null pointer or null reference is a value saved for indicating that the pointer or reference does not refer to a valid object. Programs routinely use null pointers to represent conditions such as the end of a list of unknown length or the failure to perform some action; this use of null pointers can be compared to nullable types and to the Nothing value in an option type. A null pointer should not be confused with an uninitialized pointer: a null pointer is guaranteed to compare unequal to any pointer that points to a valid object. However, depending on the language and implementation, an uninitialized pointer may not have any such guarantee. It might compare equal to other, valid pointers; or it might compare equal to null pointers. It might do both at different times; or the comparison might be undefined behaviour."@en . . "\u041D\u0443\u043B\u044C\u043E\u0432\u0438\u0439 \u0432\u043A\u0430\u0437\u0456\u0432\u043D\u0438\u043A"@uk . . . . . . "\u041D\u0443\u043B\u044C\u043E\u0432\u0438\u0439 (\u043F\u043E\u0440\u043E\u0436\u043D\u0456\u0439) \u0432\u043A\u0430\u0437\u0456\u0432\u043D\u0438\u043A (\u0440\u0456\u0434\u0448\u0435 \u2014 \u043F\u043E\u043A\u0430\u0436\u0447\u0438\u043A) \u2014 \u0432\u043A\u0430\u0437\u0456\u0432\u043D\u0438\u043A, \u044F\u043A\u0438\u0439 \u043D\u0456\u043A\u0443\u0434\u0438 \u043D\u0435 \u0432\u043A\u0430\u0437\u0443\u0454. \u0412\u0438\u043A\u043E\u0440\u0438\u0441\u0442\u043E\u0432\u0443\u0454\u0442\u044C\u0441\u044F \u0434\u043B\u044F \u0442\u043E\u0433\u043E, \u0449\u043E\u0431 \u043F\u043E\u043A\u0430\u0437\u0430\u0442\u0438, \u0449\u043E \u0434\u0430\u043D\u0430 \u0437\u043C\u0456\u043D\u043D\u0430-\u0432\u043A\u0430\u0437\u0456\u0432\u043D\u0438\u043A \u043D\u0456 \u043D\u0430 \u0449\u043E \u043D\u0435 \u043F\u043E\u0441\u0438\u043B\u0430\u0454\u0442\u044C\u0441\u044F. \u0423 \u0440\u0456\u0437\u043D\u0438\u0445 \u043C\u043E\u0432\u0430\u0445 \u043F\u0440\u043E\u0433\u0440\u0430\u043C\u0443\u0432\u0430\u043D\u043D\u044F \u043F\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043B\u0435\u043D\u0438\u0439 \u0440\u0456\u0437\u043D\u0438\u043C\u0438 \u043A\u043E\u043D\u0441\u0442\u0430\u043D\u0442\u0430\u043C\u0438, \u043D\u0430\u043F\u0440\u0438\u043A\u043B\u0430\u0434: \n* \u0423 \u043C\u0430\u0448\u0438\u043D\u043D\u0438\u0445 \u043A\u043E\u0434\u0430\u0445: 0 \n* \u0423 \u043C\u043E\u0432\u0430\u0445 Pascal, Clipper, , Ruby, Lua : nil \n* \u0423 C-\u043F\u043E\u0434\u0456\u0431\u043D\u0438\u0445 \u043C\u043E\u0432\u0430\u0445: NULL \n* \u0423 \u043C\u043E\u0432\u0430\u0445 Java \u0442\u0430 C#: null \n* \u0423 \u043C\u043E\u0432\u0456 : &null \n* \u0423 \u043C\u043E\u0432\u0456 Python: None \n* \u0423 \u043C\u043E\u0432\u0456 Visual Basic: Nothing"@uk . . . "\u041D\u0443\u043B\u044C\u043E\u0432\u0438\u0439 (\u043F\u043E\u0440\u043E\u0436\u043D\u0456\u0439) \u0432\u043A\u0430\u0437\u0456\u0432\u043D\u0438\u043A (\u0440\u0456\u0434\u0448\u0435 \u2014 \u043F\u043E\u043A\u0430\u0436\u0447\u0438\u043A) \u2014 \u0432\u043A\u0430\u0437\u0456\u0432\u043D\u0438\u043A, \u044F\u043A\u0438\u0439 \u043D\u0456\u043A\u0443\u0434\u0438 \u043D\u0435 \u0432\u043A\u0430\u0437\u0443\u0454. \u0412\u0438\u043A\u043E\u0440\u0438\u0441\u0442\u043E\u0432\u0443\u0454\u0442\u044C\u0441\u044F \u0434\u043B\u044F \u0442\u043E\u0433\u043E, \u0449\u043E\u0431 \u043F\u043E\u043A\u0430\u0437\u0430\u0442\u0438, \u0449\u043E \u0434\u0430\u043D\u0430 \u0437\u043C\u0456\u043D\u043D\u0430-\u0432\u043A\u0430\u0437\u0456\u0432\u043D\u0438\u043A \u043D\u0456 \u043D\u0430 \u0449\u043E \u043D\u0435 \u043F\u043E\u0441\u0438\u043B\u0430\u0454\u0442\u044C\u0441\u044F. \u0423 \u0440\u0456\u0437\u043D\u0438\u0445 \u043C\u043E\u0432\u0430\u0445 \u043F\u0440\u043E\u0433\u0440\u0430\u043C\u0443\u0432\u0430\u043D\u043D\u044F \u043F\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043B\u0435\u043D\u0438\u0439 \u0440\u0456\u0437\u043D\u0438\u043C\u0438 \u043A\u043E\u043D\u0441\u0442\u0430\u043D\u0442\u0430\u043C\u0438, \u043D\u0430\u043F\u0440\u0438\u043A\u043B\u0430\u0434: \n* \u0423 \u043C\u0430\u0448\u0438\u043D\u043D\u0438\u0445 \u043A\u043E\u0434\u0430\u0445: 0 \n* \u0423 \u043C\u043E\u0432\u0430\u0445 Pascal, Clipper, , Ruby, Lua : nil \n* \u0423 C-\u043F\u043E\u0434\u0456\u0431\u043D\u0438\u0445 \u043C\u043E\u0432\u0430\u0445: NULL \n* \u0423 \u043C\u043E\u0432\u0430\u0445 Java \u0442\u0430 C#: null \n* \u0423 \u043C\u043E\u0432\u0456 : &null \n* \u0423 \u043C\u043E\u0432\u0456 Python: None \n* \u0423 \u043C\u043E\u0432\u0456 Visual Basic: Nothing \u0422\u043E\u043D\u0456 \u0413\u043E\u0430\u0440, \u044F\u043A\u0438\u0439 \u0432\u0438\u043D\u0430\u0439\u0448\u043E\u0432 \u043D\u0443\u043B\u044C\u043E\u0432\u0438\u0439 \u0432\u043A\u0430\u0437\u0456\u0432\u043D\u0438\u043A \u0443 1965 \u0440\u043E\u0446\u0456, \u0432\u0432\u0430\u0436\u0430\u0454 \u0446\u0435 \u043F\u043E\u043C\u0438\u043B\u043A\u043E\u044E, \u044F\u043A\u0430 \u0456\u043C\u043E\u0432\u0456\u0440\u043D\u043E \u043A\u043E\u0448\u0442\u0443\u0432\u0430\u043B\u0430 \u043C\u0456\u043B\u044C\u044F\u0440\u0434\u0438 \u0434\u043E\u043B\u0430\u0440\u0456\u0432, \u043E\u0441\u043A\u0456\u043B\u044C\u043A\u0438 \u0441\u043F\u0440\u043E\u0431\u0430 \u0440\u043E\u0437\u0456\u043C\u0435\u043D\u0443\u0432\u0430\u043D\u043D\u044F \u043D\u0443\u043B\u044C\u043E\u0432\u043E\u0433\u043E \u0432\u043A\u0430\u0437\u0456\u0432\u043D\u0438\u043A\u0430 \u0437\u0430\u0437\u0432\u0438\u0447\u0430\u0439 \u043F\u0440\u0438\u0432\u043E\u0434\u0438\u0442\u044C \u0434\u043E \u0437\u0431\u043E\u044E \u0439 \u043F\u0440\u0438\u043F\u0438\u043D\u0435\u043D\u043D\u044F \u0440\u043E\u0431\u043E\u0442\u0438 \u043F\u0440\u043E\u0433\u0440\u0430\u043C\u0438."@uk . . . . . . . . "1116657681"^^ . "\u30CC\u30EB\u30DD\u30A4\u30F3\u30BF\uFF08\u82F1: null pointer \u82F1\u8A9E: [n\u028Cl p\u0254\u026Ant\u0259(\u0279)]\uFF09\u3068\u306F\u3001\u4F55\u306E\u30AA\u30D6\u30B8\u30A7\u30AF\u30C8\u3082\u6307\u3057\u3066\u3044\u306A\u3044\u3053\u3068\u3092\u8868\u3059\u7279\u5225\u306A\u30DD\u30A4\u30F3\u30BF\u306E\u5024\u3067\u3042\u308B\u3002 \u30D7\u30ED\u30B0\u30E9\u30E0\u3067\u306F\u30CC\u30EB\u30DD\u30A4\u30F3\u30BF\u3092\u3001\u4E0D\u5B9A\u9577\u306E\u30EA\u30B9\u30C8\u306E\u7D42\u7AEF\u3092\u8868\u3057\u305F\u308A\u3001\u4F55\u3089\u304B\u306E\u52D5\u4F5C\u306E\u7D50\u679C\u304C\u5931\u6557\u3067\u3042\u308B\u3053\u3068\u3092\u8868\u3057\u305F\u308A\u3059\u308B\u306E\u306B\u4F7F\u7528\u3059\u308B\u3002\u5F8C\u8005\u306E\u7528\u6CD5\u306F\u3001nullable\u578B\u3084\u30AA\u30D7\u30B7\u30E7\u30F3\u578B\u306E Nothing \u5024\uFF08None \u5024\uFF09\u3092\u4F7F\u7528\u3059\u308B\u3053\u3068\u3082\u3067\u304D\u308B\u3002 \u30CC\u30EB\u30DD\u30A4\u30F3\u30BF\u306E\u5024\u3084\u578B\u304C\u3044\u304B\u306A\u308B\u3082\u306E\u304B\u3068\u3044\u3046\u8A73\u7D30\u306F\u8A00\u8A9E\u306B\u3088\u3063\u3066\u7570\u306A\u308B\u3002\u5B9F\u969B\u7684\u306B\u306F\u3044\u304B\u306A\u308B\u30AA\u30D6\u30B8\u30A7\u30AF\u30C8\u3082\u53C2\u7167\u3057\u306A\u3044\u3068\u3044\u3046\u8A00\u8A9E\u3082\u3042\u308A\u3001\u53C2\u7167\u5148\u3092\u6C42\u3081\u3088\u3046\u3068\u3059\u308B\u3068Java\uFF08NullPointerException\uFF09\u306E\u3088\u3046\u306B\u4F8B\u5916\u304C\u767A\u751F\u3059\u308B\u3082\u306E\u3082\u3042\u308B\u3002 \u30CC\u30EB\u30DD\u30A4\u30F3\u30BF\u306F\u307B\u3068\u3093\u3069\u306E\u51E6\u7406\u7CFB\uFF08\u3053\u306E\u5834\u5408\u3001\u8A00\u8A9E\u51E6\u7406\u7CFB\u30D7\u30ED\u30B0\u30E9\u30E0\u3060\u3051\u3067\u306F\u306A\u304F\u3001\u30CF\u30FC\u30C9\u30A6\u30A7\u30A2\u307E\u3067\u3092\u542B\u3081\u3066\uFF09\u3067\u3001\u5185\u90E8\u7684\u306B\u6570\u50240\u3067\u8868\u73FE\u3055\u308C\u308B\u304C\u3001\u3054\u304F\u5E0C\u306B\u30010\u3067\u306A\u3044\u51E6\u7406\u7CFB\u3082\u3042\u308B\u3002\u8A00\u8A9E\u4ED5\u69D8\u4E0A\u306E\u610F\u5473\u3068\u3057\u3066\u306F\u666E\u901A\u300C\u30A2\u30C9\u30EC\u30B90\uFF08\u3042\u308B\u3044\u306F\u4ED6\u306E\u30A2\u30C9\u30EC\u30B9\uFF09\u3092\u6307\u3057\u793A\u3059\u30DD\u30A4\u30F3\u30BF\u300D\u3067\u306F\u306A\u304F\u3001\u3069\u3053\u3082\u6307\u3057\u793A\u3055\u306A\u3044\u3082\u306E\u3068\u3055\u308C\u308B\u3002 \u30CC\u30EB\u30DD\u30A4\u30F3\u30BF\u3092\u672A\u521D\u671F\u5316\u306E\u30DD\u30A4\u30F3\u30BF\u3068\u6DF7\u540C\u3057\u3066\u306F\u306A\u3089\u306A\u3044\u3002\u30CC\u30EB\u30DD\u30A4\u30F3\u30BF\u306F\u3001\u3042\u3089\u3086\u308B\u6709\u52B9\u306A\u30AA\u30D6\u30B8\u30A7\u30AF\u30C8\u3068\u3082\u7570\u306A\u308B\u3053\u3068\u304C\u4FDD\u8A3C\u3055\u308C\u3066\u3044\u308B\u3002\u305D\u308C\u306B\u5BFE\u3057\u3001\u8A00\u8A9E\u3084\u5B9F\u88C5\u306B\u3088\u3063\u3066\u306F\u3001\u672A\u521D\u671F\u5316\u306E\u30DD\u30A4\u30F3\u30BF\u306F\u305D\u306E\u3088\u3046\u306A\u4FDD\u8A3C\u306F\u306A\u304F\u3001C\u8A00\u8A9E\u306E\u81EA\u52D5\u5909\u6570\u306E\u3088\u3046\u306B\u3067\u305F\u3089\u3081\u306A\u30A2\u30C9\u30EC\u30B9\uFF08\u4E0D\u5B9A\u5024\uFF09\u3092\u6307\u3057\u3066\u3044\u308B\u53EF\u80FD\u6027\u3082\u3042\u308B\u3002 \u30CC\u30EB\u30DD\u30A4\u30F3\u30BF\u306F\u30CC\u30EB\u5024\u3068\u306F\u610F\u5473\u304C\u9055\u3046\u3002\u30CC\u30EB\u30DD\u30A4\u30F3\u30BF\u306F\u591A\u304F\u306E\u30D7\u30ED\u30B0\u30E9\u30DF\u30F3\u30B0\u8A00\u8A9E\u306B\u304A\u3044\u3066\u300C\u5024\u304C\u306A\u3044 (no value)\u300D\u3053\u3068\u3092\u610F\u5473\u3057\u3001\u30CC\u30EB\u5024\u306F\u30EA\u30EC\u30FC\u30B7\u30E7\u30CA\u30EB\u30C7\u30FC\u30BF\u30D9\u30FC\u30B9\u306B\u304A\u3044\u3066\u300C\u672A\u8A73\u5024 (unknown value)\u300D\u3067\u3042\u308B\u3053\u3068\u3092\u610F\u5473\u3059\u308B\u3002\u307B\u3068\u3093\u3069\u306E\u30D7\u30ED\u30B0\u30E9\u30DF\u30F3\u30B0\u8A00\u8A9E\u3067\u306F2\u3064\u306E\u30CC\u30EB\u30DD\u30A4\u30F3\u30BF\u306F\u7B49\u3057\u3044\u304C\u3001\u30EA\u30EC\u30FC\u30B7\u30E7\u30CA\u30EB\u30C7\u30FC\u30BF\u30D9\u30FC\u30B9\u30A8\u30F3\u30B8\u30F3\u306F2\u3064\u306E\u30CC\u30EB\u5024\u3092\u7B49\u3057\u3044\u3068\u306F\u307F\u306A\u3055\u306A\u3044\uFF08\u305D\u308C\u3089\u306F\u672A\u8A73\u5024\u3092\u8868\u3057\u3066\u3044\u308B\u306E\u3067\u3001\u305D\u308C\u3089\u304C\u7B49\u3057\u3044\u304B\u3069\u3046\u304B\u306F\u308F\u304B\u3089\u306A\u3044\uFF09\u3002"@ja . . . . . . . . . . . . . . . . . . "\u5728\u7A0B\u5F0F\u8A9E\u8A00\u4E2D\uFF0C\u7A7A\u6307\u6A19\uFF08\u82F1\u8A9E\uFF1ANull Pointer\uFF09\u662F\u4E00\u500B\u5DF2\u5BA3\u544A\u4F46\u4E26\u672A\u6307\u5411\u4E00\u500B\u6709\u6548\u7269\u4EF6\u7684\u6307\u6A19\uFF0C\u8A31\u591A\u7A0B\u5F0F\u5229\u7528\u7A7A\u6307\u6A19\u4F86\u8868\u793A\u67D0\u4E9B\u7279\u5B9A\u689D\u4EF6\uFF0C\u4F8B\u5982\u672A\u77E5\u9577\u5EA6\u9663\u5217\u7684\u7D50\u5C3E\u6216\u67D0\u4E9B\u7121\u6CD5\u57F7\u884C\u7684\u64CD\u4F5C\u3002\u5728\u53EF\u9078\u64C7\u578B\u614B\uFF08optional type\uFF09\u7684\u7A0B\u5F0F\u8A9E\u8A00\u4E2D\uFF0C\u7A7A\u6307\u6A19\u901A\u5E38\u53EF\u4EE5\u8DDF\u53EF\u70BANull\u7684\u578B\u5225\uFF08Nullable types\uFF09\u548C\u7A7A\u503C\uFF08Nothing value\uFF09\u9032\u884C\u6BD4\u8F03\u3002 \u7A7A\u6307\u6A19\u8207\u6307\u6A19\uFF08uninitialized pointer\uFF09\u4E0D\u540C\uFF0C\u7A7A\u6307\u6A19\u4FDD\u8B49\u4E0D\u6703\u548C\u6709\u503C\u7684\u6307\u6A19\u76F8\u7B49\uFF0C\u800C\u672A\u521D\u59CB\u5316\u7684\u6307\u6A19\u5247\u662F\u8981\u770B\u6240\u4F7F\u7528\u7684\u7A0B\u5F0F\u8A9E\u8A00\u6216\u7DE8\u8B6F\u5668\u800C\u5B9A\uFF0C\u5728\u90E8\u5206\u7A0B\u5F0F\u8A9E\u8A00\u74B0\u5883\u4E0B\uFF0C\u672A\u521D\u59CB\u5316\u7684\u6307\u6A19\u7121\u6CD5\u4FDD\u8B49\u4E0D\u8207\u6709\u503C\u7684\u6307\u6A19\u76F8\u7B49\uFF0C\u4ED6\u53EF\u80FD\u56E0\u70BA\u5B58\u6709\u8A18\u61B6\u9AD4\u6B98\u503C\u800C\u6307\u5411\u4E86\u67D0\u500B\u6709\u6548\u7269\u4EF6\u3002"@zh . "Nulov\u00FD ukazatel nebo nulov\u00E1 reference je ozna\u010Den\u00ED pro zvl\u00E1\u0161tn\u00ED hodnotu ukazatele nebo reference zna\u010D\u00EDc\u00ED speci\u00E1ln\u00ED pr\u00E1zdnou hodnotu, tedy \u201Enic\u201C. V programech je tato speci\u00E1ln\u00ED hodnota b\u011B\u017En\u011B vyu\u017E\u00EDv\u00E1na nap\u0159\u00EDklad jako n\u00E1vratov\u00E1 hodnota zna\u010D\u00EDc\u00ED, \u017Ee podprogramu se nepoda\u0159ilo nal\u00E9zt po\u017Eadovan\u00FD z\u00E1znam nebo po\u017Eadovanou instanci. Jin\u00FDm zp\u016Fsobem vyu\u017Eit\u00ED je nazna\u010Den\u00ED konce dynamick\u00E9 datov\u00E9 struktury, nap\u0159\u00EDklad koncov\u00FD z\u00E1znam spojov\u00E9ho seznamu m\u00E1 jako ukazatel na dal\u0161\u00ED z\u00E1znam nulov\u00FD ukazatel a v listech stromu jsou jako hodnoty potomk\u016F nulov\u00E9 ukazatele."@cs . . . . . . "Nulov\u00FD ukazatel nebo nulov\u00E1 reference je ozna\u010Den\u00ED pro zvl\u00E1\u0161tn\u00ED hodnotu ukazatele nebo reference zna\u010D\u00EDc\u00ED speci\u00E1ln\u00ED pr\u00E1zdnou hodnotu, tedy \u201Enic\u201C. V programech je tato speci\u00E1ln\u00ED hodnota b\u011B\u017En\u011B vyu\u017E\u00EDv\u00E1na nap\u0159\u00EDklad jako n\u00E1vratov\u00E1 hodnota zna\u010D\u00EDc\u00ED, \u017Ee podprogramu se nepoda\u0159ilo nal\u00E9zt po\u017Eadovan\u00FD z\u00E1znam nebo po\u017Eadovanou instanci. Jin\u00FDm zp\u016Fsobem vyu\u017Eit\u00ED je nazna\u010Den\u00ED konce dynamick\u00E9 datov\u00E9 struktury, nap\u0159\u00EDklad koncov\u00FD z\u00E1znam spojov\u00E9ho seznamu m\u00E1 jako ukazatel na dal\u0161\u00ED z\u00E1znam nulov\u00FD ukazatel a v listech stromu jsou jako hodnoty potomk\u016F nulov\u00E9 ukazatele. Programovac\u00ED jazyky maj\u00ED pro nulov\u00E9 ukazatele obvykle definov\u00E1no zvl\u00E1\u0161tn\u00ED kl\u00ED\u010Dov\u00E9 slovo. V C i C++ je to NULL, ale nap\u0159\u00EDklad C99 z\u00E1rove\u0148 umo\u017E\u0148uje pou\u017E\u00EDt celo\u010D\u00EDselnou 0 a C++11 zav\u00E1d\u00ED zvl\u00E1\u0161tn\u00ED konstantu nullptr. Pascal pou\u017E\u00EDv\u00E1 ozna\u010Den\u00ED nil a pou\u017E\u00EDv\u00E1 void. Proto\u017Ee nulov\u00FD ukazatel ve skute\u010Dnosti na nic neukazuje, pokusy o jeho dereferenci kon\u010D\u00ED b\u011Bhovou chybou. V programech v C\u00E9\u010Dku se typicky jedn\u00E1 o chybu poru\u0161en\u00ED ochrany pam\u011Bti, kter\u00E1 vede k okam\u017Eit\u00E9mu p\u00E1du programu. Nulov\u00E1 reference byla vynalezena C. A. R. Hoarem v roce 1965 p\u0159i jeho pr\u00E1ci na jazyku . On s\u00E1m zp\u011Btn\u011B zaveden\u00ED nulov\u00E9 reference lituje a domn\u00EDv\u00E1 se, \u017Ee jej\u00ED pou\u017E\u00EDv\u00E1n\u00ED zp\u016Fsobilo b\u011Bhem let zna\u010Dn\u00E9 \u0161kody."@cs . "In computing, a null pointer or null reference is a value saved for indicating that the pointer or reference does not refer to a valid object. Programs routinely use null pointers to represent conditions such as the end of a list of unknown length or the failure to perform some action; this use of null pointers can be compared to nullable types and to the Nothing value in an option type."@en . "Null pointer"@en . . "\u30CC\u30EB\u30DD\u30A4\u30F3\u30BF\uFF08\u82F1: null pointer \u82F1\u8A9E: [n\u028Cl p\u0254\u026Ant\u0259(\u0279)]\uFF09\u3068\u306F\u3001\u4F55\u306E\u30AA\u30D6\u30B8\u30A7\u30AF\u30C8\u3082\u6307\u3057\u3066\u3044\u306A\u3044\u3053\u3068\u3092\u8868\u3059\u7279\u5225\u306A\u30DD\u30A4\u30F3\u30BF\u306E\u5024\u3067\u3042\u308B\u3002 \u30D7\u30ED\u30B0\u30E9\u30E0\u3067\u306F\u30CC\u30EB\u30DD\u30A4\u30F3\u30BF\u3092\u3001\u4E0D\u5B9A\u9577\u306E\u30EA\u30B9\u30C8\u306E\u7D42\u7AEF\u3092\u8868\u3057\u305F\u308A\u3001\u4F55\u3089\u304B\u306E\u52D5\u4F5C\u306E\u7D50\u679C\u304C\u5931\u6557\u3067\u3042\u308B\u3053\u3068\u3092\u8868\u3057\u305F\u308A\u3059\u308B\u306E\u306B\u4F7F\u7528\u3059\u308B\u3002\u5F8C\u8005\u306E\u7528\u6CD5\u306F\u3001nullable\u578B\u3084\u30AA\u30D7\u30B7\u30E7\u30F3\u578B\u306E Nothing \u5024\uFF08None \u5024\uFF09\u3092\u4F7F\u7528\u3059\u308B\u3053\u3068\u3082\u3067\u304D\u308B\u3002 \u30CC\u30EB\u30DD\u30A4\u30F3\u30BF\u306E\u5024\u3084\u578B\u304C\u3044\u304B\u306A\u308B\u3082\u306E\u304B\u3068\u3044\u3046\u8A73\u7D30\u306F\u8A00\u8A9E\u306B\u3088\u3063\u3066\u7570\u306A\u308B\u3002\u5B9F\u969B\u7684\u306B\u306F\u3044\u304B\u306A\u308B\u30AA\u30D6\u30B8\u30A7\u30AF\u30C8\u3082\u53C2\u7167\u3057\u306A\u3044\u3068\u3044\u3046\u8A00\u8A9E\u3082\u3042\u308A\u3001\u53C2\u7167\u5148\u3092\u6C42\u3081\u3088\u3046\u3068\u3059\u308B\u3068Java\uFF08NullPointerException\uFF09\u306E\u3088\u3046\u306B\u4F8B\u5916\u304C\u767A\u751F\u3059\u308B\u3082\u306E\u3082\u3042\u308B\u3002 \u30CC\u30EB\u30DD\u30A4\u30F3\u30BF\u306F\u307B\u3068\u3093\u3069\u306E\u51E6\u7406\u7CFB\uFF08\u3053\u306E\u5834\u5408\u3001\u8A00\u8A9E\u51E6\u7406\u7CFB\u30D7\u30ED\u30B0\u30E9\u30E0\u3060\u3051\u3067\u306F\u306A\u304F\u3001\u30CF\u30FC\u30C9\u30A6\u30A7\u30A2\u307E\u3067\u3092\u542B\u3081\u3066\uFF09\u3067\u3001\u5185\u90E8\u7684\u306B\u6570\u50240\u3067\u8868\u73FE\u3055\u308C\u308B\u304C\u3001\u3054\u304F\u5E0C\u306B\u30010\u3067\u306A\u3044\u51E6\u7406\u7CFB\u3082\u3042\u308B\u3002\u8A00\u8A9E\u4ED5\u69D8\u4E0A\u306E\u610F\u5473\u3068\u3057\u3066\u306F\u666E\u901A\u300C\u30A2\u30C9\u30EC\u30B90\uFF08\u3042\u308B\u3044\u306F\u4ED6\u306E\u30A2\u30C9\u30EC\u30B9\uFF09\u3092\u6307\u3057\u793A\u3059\u30DD\u30A4\u30F3\u30BF\u300D\u3067\u306F\u306A\u304F\u3001\u3069\u3053\u3082\u6307\u3057\u793A\u3055\u306A\u3044\u3082\u306E\u3068\u3055\u308C\u308B\u3002"@ja . . . . . . . . . . "1175028"^^ . . "\uB110 \uD3EC\uC778\uD130(null pointer)\uB294 \uC720\uD6A8\uD55C \uAC1D\uCCB4\uB97C \uCC38\uC870\uD558\uC9C0 \uC54A\uB294 \uD3EC\uC778\uD130\uB97C \uB098\uD0C0\uB0B4\uAE30 \uC704\uD574 \uC608\uC57D\uB41C \uAC12\uC744 \uAC16\uB294\uB2E4. \uD504\uB85C\uADF8\uB7A8\uB4E4\uC740 \uC77C\uC0C1\uC801\uC73C\uB85C \uC54C\uB824\uC9C0\uC9C0 \uC54A\uC740 \uAE38\uC774\uB97C \uAC00\uC9C4 \uB9AC\uC2A4\uD2B8\uC758 \uB05D\uC774\uB098 \uD2B9\uC815\uD55C \uD589\uB3D9 \uC218\uD589 \uC2E4\uD328 \uAC19\uC740 \uC870\uAC74\uB4E4\uC744 \uD45C\uD604\uD558\uAE30 \uC704\uD574 \uB110 \uD3EC\uC778\uD130\uB97C \uC0AC\uC6A9\uD55C\uB2E4; \uB110 \uD3EC\uC778\uD130\uB4E4\uC758 \uC774\uB7EC\uD55C \uC0AC\uC6A9\uC740 Nullabe \uD0C0\uC785\uB4E4, \uC635\uC158 \uD0C0\uC785\uC5D0\uC11C\uC758 Nothing \uAC12\uACFC \uBE44\uAD50\uB420 \uC218 \uC788\uB2E4. \uB110 \uD3EC\uC778\uD130\uB294 \uBC18\uB4DC\uC2DC \uCD08\uAE30\uD654\uB418\uC9C0 \uC54A\uC740 \uD3EC\uC778\uD130\uC640 \uD63C\uB3D9\uB418\uC5B4\uC11C\uB294 \uC548\uB41C\uB2E4: \uB110\uD3EC\uC778\uD130\uB294 \uC720\uD6A8\uD55C \uAC1D\uCCB4\uB97C \uAC00\uB9AC\uD0A4\uB294 \uC5B4\uB290 \uD3EC\uC778\uD130\uC640 \uBE44\uAD50\uD574\uB3C4 \uAC19\uC9C0 \uC54A\uAC8C \uBCF4\uC7A5\uB41C\uB2E4. \uADF8\uB7EC\uB098 \uC5B8\uC5B4\uC640 \uAD6C\uD604\uC5D0 \uB530\uB77C\uC11C, \uCD08\uAE30\uD654\uB418\uC9C0 \uC54A\uC740 \uD3EC\uC778\uD130\uB294 \uC774\uAC83\uC744 \uBCF4\uC7A5\uD558\uC9C0 \uC54A\uB294\uB2E4. \uCD08\uAE30\uD654\uB418\uC9C0 \uC54A\uC740 \uD3EC\uC778\uD130 \uB2E4\uB978 \uC720\uD6A8\uD55C \uD3EC\uC778\uD130\uB4E4 \uB610\uB294 \uB110 \uD3EC\uC778\uD130\uB4E4\uACFC \uBE44\uAD50\uD574\uC11C \uAC19\uC744 \uC218 \uC788\uB2E4. \uC989, \uCD08\uAE30\uD654\uB418\uC9C0 \uC54A\uC740 \uD3EC\uC778\uD130\uB294 \uB54C\uC5D0 \uB530\uB77C\uC11C \uB450 \uACBD\uC6B0 \uBAA8\uB450\uAC00 \uB420 \uC218 \uC788\uB2E4. \uB110 \uD3EC\uC778\uD130\uB294 \uB110 \uAC12\uACFC\uB294 \uB2E4\uB978 \uC758\uBBF8\uB97C \uAC16\uB294\uB2E4. \uB300\uBD80\uBD84\uC758 \uD504\uB85C\uADF8\uB798\uBC0D \uC5B8\uC5B4\uC5D0\uC11C \uB110 \uD3EC\uC778\uD130\uB294 \"\uAC12 \uC5C6\uC74C\"\uC744 \uC758\uBBF8\uD558\uC9C0\uB9CC, \uAD00\uACC4\uD615 \uB370\uC774\uD130\uBCA0\uC774\uC2A4\uC5D0\uC11C \uB110 \uAC12\uC740 \"\uC54C\uB824\uC9C0\uC9C0 \uC54A\uC740 \uAC12\"\uC744 \uC758\uBBF8\uD55C\uB2E4. \uC774\uAC83\uC740 \uC2E4\uC9C8\uC801\uC73C\uB85C \uC911\uC694\uD55C \uCC28\uC774\uB85C \uC774\uB04C\uC5B4 \uC9C4\uB2E4: \uB300\uBD80\uBD84\uC758 \uD504\uB85C\uADF8\uB798\uBC0D \uC5B8\uC5B4\uB4E4\uC740 \uB450 \uB110 \uD3EC\uC778\uD130\uB97C \uAC19\uB2E4\uACE0 \uC5EC\uAE30\uC9C0\uB9CC, \uAD00\uACC4\uD615 \uB370\uC774\uD130\uBCA0\uC774\uC2A4 \uC5D4\uC9C4\uC740 \uB450 \uB110 \uAC12\uC744 \uAC19\uB2E4\uACE0 \uC5EC\uAE30\uC9C0 \uC54A\uB294\uB2E4(\uC65C\uB0D0\uD558\uBA74 \uC774\uAC83\uB4E4\uC740 \uC54C\uB824\uC9C0\uC9C0 \uC54A\uC740 \uAC12\uB4E4\uC744 \uC758\uBBF8\uD574\uC11C, \uC774\uAC83\uB4E4\uC774 \uAC19\uC740\uC9C0\uB3C4 \uC54C\uB824\uC838 \uC788\uC9C0 \uC54A\uC73C\uBBC0\uB85C)."@ko . . "\u5728\u7A0B\u5F0F\u8A9E\u8A00\u4E2D\uFF0C\u7A7A\u6307\u6A19\uFF08\u82F1\u8A9E\uFF1ANull Pointer\uFF09\u662F\u4E00\u500B\u5DF2\u5BA3\u544A\u4F46\u4E26\u672A\u6307\u5411\u4E00\u500B\u6709\u6548\u7269\u4EF6\u7684\u6307\u6A19\uFF0C\u8A31\u591A\u7A0B\u5F0F\u5229\u7528\u7A7A\u6307\u6A19\u4F86\u8868\u793A\u67D0\u4E9B\u7279\u5B9A\u689D\u4EF6\uFF0C\u4F8B\u5982\u672A\u77E5\u9577\u5EA6\u9663\u5217\u7684\u7D50\u5C3E\u6216\u67D0\u4E9B\u7121\u6CD5\u57F7\u884C\u7684\u64CD\u4F5C\u3002\u5728\u53EF\u9078\u64C7\u578B\u614B\uFF08optional type\uFF09\u7684\u7A0B\u5F0F\u8A9E\u8A00\u4E2D\uFF0C\u7A7A\u6307\u6A19\u901A\u5E38\u53EF\u4EE5\u8DDF\u53EF\u70BANull\u7684\u578B\u5225\uFF08Nullable types\uFF09\u548C\u7A7A\u503C\uFF08Nothing value\uFF09\u9032\u884C\u6BD4\u8F03\u3002 \u7A7A\u6307\u6A19\u8207\u6307\u6A19\uFF08uninitialized pointer\uFF09\u4E0D\u540C\uFF0C\u7A7A\u6307\u6A19\u4FDD\u8B49\u4E0D\u6703\u548C\u6709\u503C\u7684\u6307\u6A19\u76F8\u7B49\uFF0C\u800C\u672A\u521D\u59CB\u5316\u7684\u6307\u6A19\u5247\u662F\u8981\u770B\u6240\u4F7F\u7528\u7684\u7A0B\u5F0F\u8A9E\u8A00\u6216\u7DE8\u8B6F\u5668\u800C\u5B9A\uFF0C\u5728\u90E8\u5206\u7A0B\u5F0F\u8A9E\u8A00\u74B0\u5883\u4E0B\uFF0C\u672A\u521D\u59CB\u5316\u7684\u6307\u6A19\u7121\u6CD5\u4FDD\u8B49\u4E0D\u8207\u6709\u503C\u7684\u6307\u6A19\u76F8\u7B49\uFF0C\u4ED6\u53EF\u80FD\u56E0\u70BA\u5B58\u6709\u8A18\u61B6\u9AD4\u6B98\u503C\u800C\u6307\u5411\u4E86\u67D0\u500B\u6709\u6548\u7269\u4EF6\u3002"@zh . . . . . "\u30CC\u30EB\u30DD\u30A4\u30F3\u30BF"@ja . . "\u7A7A\u6307\u6A19"@zh . . . "\uB110 \uD3EC\uC778\uD130"@ko . . . . . . . . . . . . . . "\uB110 \uD3EC\uC778\uD130(null pointer)\uB294 \uC720\uD6A8\uD55C \uAC1D\uCCB4\uB97C \uCC38\uC870\uD558\uC9C0 \uC54A\uB294 \uD3EC\uC778\uD130\uB97C \uB098\uD0C0\uB0B4\uAE30 \uC704\uD574 \uC608\uC57D\uB41C \uAC12\uC744 \uAC16\uB294\uB2E4. \uD504\uB85C\uADF8\uB7A8\uB4E4\uC740 \uC77C\uC0C1\uC801\uC73C\uB85C \uC54C\uB824\uC9C0\uC9C0 \uC54A\uC740 \uAE38\uC774\uB97C \uAC00\uC9C4 \uB9AC\uC2A4\uD2B8\uC758 \uB05D\uC774\uB098 \uD2B9\uC815\uD55C \uD589\uB3D9 \uC218\uD589 \uC2E4\uD328 \uAC19\uC740 \uC870\uAC74\uB4E4\uC744 \uD45C\uD604\uD558\uAE30 \uC704\uD574 \uB110 \uD3EC\uC778\uD130\uB97C \uC0AC\uC6A9\uD55C\uB2E4; \uB110 \uD3EC\uC778\uD130\uB4E4\uC758 \uC774\uB7EC\uD55C \uC0AC\uC6A9\uC740 Nullabe \uD0C0\uC785\uB4E4, \uC635\uC158 \uD0C0\uC785\uC5D0\uC11C\uC758 Nothing \uAC12\uACFC \uBE44\uAD50\uB420 \uC218 \uC788\uB2E4. \uB110 \uD3EC\uC778\uD130\uB294 \uBC18\uB4DC\uC2DC \uCD08\uAE30\uD654\uB418\uC9C0 \uC54A\uC740 \uD3EC\uC778\uD130\uC640 \uD63C\uB3D9\uB418\uC5B4\uC11C\uB294 \uC548\uB41C\uB2E4: \uB110\uD3EC\uC778\uD130\uB294 \uC720\uD6A8\uD55C \uAC1D\uCCB4\uB97C \uAC00\uB9AC\uD0A4\uB294 \uC5B4\uB290 \uD3EC\uC778\uD130\uC640 \uBE44\uAD50\uD574\uB3C4 \uAC19\uC9C0 \uC54A\uAC8C \uBCF4\uC7A5\uB41C\uB2E4. \uADF8\uB7EC\uB098 \uC5B8\uC5B4\uC640 \uAD6C\uD604\uC5D0 \uB530\uB77C\uC11C, \uCD08\uAE30\uD654\uB418\uC9C0 \uC54A\uC740 \uD3EC\uC778\uD130\uB294 \uC774\uAC83\uC744 \uBCF4\uC7A5\uD558\uC9C0 \uC54A\uB294\uB2E4. \uCD08\uAE30\uD654\uB418\uC9C0 \uC54A\uC740 \uD3EC\uC778\uD130 \uB2E4\uB978 \uC720\uD6A8\uD55C \uD3EC\uC778\uD130\uB4E4 \uB610\uB294 \uB110 \uD3EC\uC778\uD130\uB4E4\uACFC \uBE44\uAD50\uD574\uC11C \uAC19\uC744 \uC218 \uC788\uB2E4. \uC989, \uCD08\uAE30\uD654\uB418\uC9C0 \uC54A\uC740 \uD3EC\uC778\uD130\uB294 \uB54C\uC5D0 \uB530\uB77C\uC11C \uB450 \uACBD\uC6B0 \uBAA8\uB450\uAC00 \uB420 \uC218 \uC788\uB2E4."@ko . . .