{"id":31726,"date":"2023-04-27T19:26:45","date_gmt":"2023-03-17T21:58:44","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e5%92%8ckotlin%e4%b8%ad%e7%9a%84%e5%8f%98%e5%bc%82\/"},"modified":"2024-04-30T01:35:15","modified_gmt":"2024-04-29T17:35:15","slug":"java%e5%92%8ckotlin%e4%b8%ad%e7%9a%84%e5%8f%98%e5%bc%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e5%92%8ckotlin%e4%b8%ad%e7%9a%84%e5%8f%98%e5%bc%82\/","title":{"rendered":"Java\u548cKotlin\u4e2d\u7684\u53d8\u5f02"},"content":{"rendered":"

\u6211\u4e00\u76f4\u5bf9Java\u7684\u6cdb\u578b\u5f88\u611f\u5174\u8da3\uff0c\u60f3\u5728\u81ea\u5df1\u7684\u8111\u6d77\u4e2d\u7b80\u5355\u603b\u7ed3\u4e00\u4e0b\u6211\u6240\u8c03\u67e5\u7684\u5185\u5bb9\u3002\u6b64\u5916\uff0c\u6211\u8fd8\u60f3\u4e0e\u6211\u6700\u8fd1\u559c\u7231\u7684\u8bed\u8a00Kotlin\u8fdb\u884c\u6bd4\u8f83\u3002\u56e0\u4e3a\u6211\u4ecd\u7136\u662f\u4e00\u4e2a\u5b66\u4e60\u4e2d\u7684\u4eba\uff0c\u6240\u4ee5\u5982\u679c\u6709\u9519\u8bef\uff0c\u8bf7\u8c05\u89e3\u3002<\/p>\n

\u6c38\u6052\u4e0d\u53d8<\/h1>\n

\u5fc5\u987b\u662f\u76f8\u540c\u7684\u7c7b\u578b\u3002<\/p>\n

Java<\/h2>\n

Java \u4f5c\u4e3a\u4e00\u79cd\u7f16\u7a0b\u8bed\u8a00\uff0c\u5728\u8f6f\u4ef6\u5f00\u53d1\u4e2d\u5177\u6709\u5e7f\u6cdb\u7684\u5e94\u7528\u3002\u5b83\u662f\u4e00\u79cd\u53ef\u79fb\u690d\u3001\u8de8\u5e73\u53f0\u7684\u7f16\u7a0b\u8bed\u8a00\uff0c\u88ab\u5e7f\u6cdb\u7528\u4e8e\u5f00\u53d1\u5404\u79cd\u5e94\u7528\u7a0b\u5e8f\u548c\u4e92\u8054\u7f51\u5e94\u7528\u3002Java\u5177\u6709\u7b80\u5355\u6613\u5b66\u3001\u9762\u5411\u5bf9\u8c61\u3001\u53ef\u9760\u6027\u9ad8\u7b49\u4f18\u70b9\uff0c\u88ab\u79f0\u4e3a\u4e00\u79cd\u901a\u7528\u7684\u7f16\u7a0b\u8bed\u8a00\u3002\u4e0d\u4ec5\u5982\u6b64\uff0cJava\u8fd8\u6709\u4e00\u4e2a\u5e9e\u5927\u7684\u5f00\u53d1\u793e\u533a\uff0c\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u5f00\u53d1\u5de5\u5177\u548c\u8d44\u6e90\uff0c\u4f7f\u5f97\u5f00\u53d1\u4eba\u5458\u80fd\u591f\u66f4\u52a0\u9ad8\u6548\u5730\u5f00\u53d1\u51fa\u9ad8\u8d28\u91cf\u7684\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n

Note: The provided translation is in simplified Chinese.<\/p>\n

\u5728Java\u4e2d\uff0c\u4e0d\u53d8\u6027\u662f\u6307List\u3002<\/p>\n

List<\/span><<\/span>String<\/span>><\/span> strList<\/span> =<\/span> new<\/span> ArrayList<\/span><<\/span>String<\/span>>();<\/span>\r\nList<\/span><<\/span>Object<\/span>><\/span> objList<\/span> =<\/span> strList<\/span>;<\/span> \/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc  \u4e0d\u5909\u306e\u305f\u3081\u4ee3\u5165\u3067\u304d\u306a\u3044<\/span>\r\n<\/code><\/pre>\n
\u5728Java\u4e2d\uff0c\u6570\u7ec4\u662f\u534f\u53d8\u7684\u3002<\/p>\n
Kotlin \u54c8\u54c8<\/h2>\n
\u4e0eJava\u4e0d\u540c\uff0c\u8fd9\u662f\u4e00\u4e2a\u6570\u7ec4\u3002
\n\u6b64\u5916\uff0cKotlin\u53ef\u4ee5\u4f7f\u7528listOf\uff0carrayListOf\u548cmutableListOf\u6765\u521b\u5efaJava\u4e2d\u7684\u5217\u8868\u3002<\/p>\n
\/\/\u914d\u5217<\/span>\r\nval<\/span> intArray<\/span>:<\/span> Array<\/span><<\/span>Int<\/span>><\/span> =<\/span> arrayOf<\/span>(<\/span>1<\/span>,<\/span>2<\/span>)<\/span>\r\nval<\/span> numArray<\/span>:<\/span> Array<\/span><<\/span>Any<\/span>?<\/span>><\/span> =<\/span> intArray<\/span> \/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u3000\u5171\u5909\u3067\u306f\u306a\u3044\u305f\u3081<\/span>\r\n\r\n\/\/\u30ea\u30b9\u30c8<\/span>\r\nval<\/span> strList<\/span>:<\/span> java<\/span>.<\/span>util<\/span>.<\/span>ArrayList<\/span><<\/span>String<\/span>><\/span> =<\/span> arrayListOf<\/span>(<\/span>\"1st\"<\/span>,<\/span> \"2nd\"<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u6211\u5b9a\u4e49\u4e86\u4e00\u4e2a Array \u7c7b\u578b\uff0c\u4f46\u5728 Kotlin \u4e2d\u4f3c\u4e4e\u8fd8\u53ef\u4ee5\u4e3a\u6bcf\u79cd\u7c7b\u578b\u51c6\u5907\u6570\u7ec4\u3002<\/p>\n
val<\/span> intArray<\/span>:<\/span> IntArray<\/span> =<\/span> intArrayOf<\/span>(<\/span>3<\/span>,<\/span>4<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u5171\u5909 \u53ef\u4ee5\u88ab\u89e3\u91ca\u4e3a\u7269\u4f53\u6216\u7cfb\u7edf\u5728\u53d8\u5316\u8fc7\u7a0b\u4e2d\u5f7c\u6b64\u4fdd\u6301\u76f8\u5bf9\u5173\u7cfb\u7684\u6027\u8d28\u3002<\/h1>\n
\u53ef\u4ee5\u5c06\u72ed\u4e49\u7684\u4e8b\u7269\u7eb3\u5165\u5230\u5e7f\u4e49\u7684\u5b9a\u4e49\u4e2d\u3002<\/p>\n
Java
\nJava \u8bed\u8a00<\/h2>\n
\u5728Java\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u6570\u7ec4\u548c\u5e26\u6709\u4e0a\u9650\u8fb9\u754c\u7684\u901a\u914d\u7b26\u6765\u5b9e\u73b0\u534f\u53d8\u3002
\n\u7531\u4e8eString\u7c7b\u578b\u662fObject\u7c7b\u578b\u7684\u5b50\u7c7b\uff0c\u53ef\u4ee5\u5206\u522b\u6309\u4ee5\u4e0b\u65b9\u5f0f\u6765\u8868\u793a\u3002<\/p>\n
\/\/\u914d\u5217<\/span>\r\nString<\/span>[]<\/span> strArray<\/span> =<\/span> {<\/span>\"hoge\"<\/span>,<\/span> \"foo\"<\/span>};<\/span>\r\nObject<\/span>[]<\/span> objArray<\/span> =<\/span> strArray<\/span>;<\/span>\r\n\r\n\/\/\u4e0a\u9650\u4ed8\u304d\u5883\u754c\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9<\/span>\r\nList<\/span><<\/span>String<\/span>><\/span> strList<\/span> =<\/span> new<\/span> ArrayList<\/span><<\/span>String<\/span>>();<\/span>\r\nList<\/span><?<\/span> extends<\/span> Object<\/span>><\/span> objList<\/span> =<\/span> strList<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u65e0\u6cd5\u5b58\u50a8\u4e0d\u540c\u7c7b\u578b\u7684\u5bf9\u8c61\u3002<\/p>\n
objArray<\/span>[<\/span>0<\/span>]<\/span> =<\/span> 1<\/span>;<\/span> \/\/\u30e9\u30f3\u30bf\u30a4\u30e0\u30a8\u30e9\u30fc<\/span>\r\n<\/code><\/pre>\n
\u5728String\u7c7b\u578b\u7684\u6570\u7ec4\u4e2d\uff0c\u5373\u4f7f\u653e\u5165\u5176\u4ed6\u7c7b\u578b\u7684\u5143\u7d20\u4e5f\u80fd\u901a\u8fc7\u7f16\u8bd1\uff0c\u4f46\u5728\u8fd0\u884c\u65f6\u4f1a\u4ea7\u751f\u9519\u8bef\u3002
\n\u800c\u5728\u5217\u8868\u4e2d\uff0c\u65e0\u8bba\u662fString\u7c7b\u578b\u8fd8\u662fObject\u7c7b\u578b\uff0c\u90fd\u4e0d\u80fd\u4f7f\u7528add\u65b9\u6cd5\u6dfb\u52a0\u5143\u7d20\uff0c\u4f46\u53ef\u4ee5\u4f7f\u7528get\u65b9\u6cd5\u83b7\u53d6String\u7c7b\u578b\u6216Object\u7c7b\u578b\u7684\u5143\u7d20\u3002
\n\uff08\u53ef\u4ee5\u6dfb\u52a0null\u5143\u7d20\uff09\u3002<\/p>\n
Kotlin\uff08\u79d1\u7279\u6797\uff09<\/h2>\n
\u5728Kotlin\u4e2d\uff0c\u4f7f\u7528out\u4fee\u9970\u7b26\u5b9e\u73b0\u4e86\u534f\u53d8\u3002\u4e0eJava\u7684\u6570\u7ec4\u4e0d\u540c\u7684\u662f\uff0c\u5b83\u53ea\u5141\u8bb8\u8f93\u51fa\uff0c\u4ece\u800c\u53ef\u4ee5\u5b89\u5168\u5730\u5904\u7406\u3002<\/p>\n
val<\/span> intArray<\/span>:<\/span> Array<\/span><<\/span>Int<\/span>><\/span> =<\/span> arrayOf<\/span>(<\/span>1<\/span>,<\/span>2<\/span>)<\/span>\r\nval<\/span> numArray<\/span>:<\/span> Array<\/span><<\/span>out<\/span> Any<\/span>?<\/span>><\/span> =<\/span> intArray<\/span>\r\nnumArray<\/span>[<\/span>0<\/span>]<\/span> =<\/span> 1<\/span> \/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/span>\r\n<\/code><\/pre>\n
\u9006\u53d8<\/h1>\n
\u5b83\u7684\u53cd\u4e49\u8bcd\u662f\u53cd\u53d8\u3002<\/p>\n
Java – Java<\/h2>\n
\u5728Java\u4e2d\uff0c\u534f\u53d8\u6709\u4e0b\u754c\u9650\u5b9a\u901a\u914d\u7b26\u3002\u7531\u4e8eObject\u7c7b\u578b\u62e5\u6709String\u7c7b\u578b\u7684\u5b50\u7c7b\uff0c\u56e0\u6b64\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u7f16\u5199\u3002<\/p>\n
\/\/\u4e0b\u9650\u4ed8\u304d\u5883\u754c\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9<\/span>\r\nList<\/span><<\/span>Object<\/span>><\/span> objList<\/span> =<\/span> new<\/span> ArrayList<\/span><<\/span>Object<\/span>>();<\/span>\r\nList<\/span><?<\/span> super<\/span> String<\/span>><\/span> strList<\/span> =<\/span> objList<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u901a\u8fc7\u4e0b\u9650\u9650\u5236\uff0c\u53ef\u4ee5\u901a\u8fc7add\u65b9\u6cd5\u6dfb\u52a0String\u7c7b\u578b\u53ca\u5176\u5b50\u7c7b\u3002\u8fd8\u53ef\u4ee5\u6dfb\u52a0null\u3002
\n\u76f8\u53cd\uff0c\u5728get\u65b9\u6cd5\u4e2d\u53ea\u80fd\u83b7\u53d6Object\u7c7b\u578b\uff0c\u5b83\u662f\u6240\u6709\u8d85\u7c7b\u7684\u7c7b\u578b\u3002<\/p>\n
Kotlin \u2192 Kotlin\u662f\u4e00\u79cd\u7f16\u7a0b\u8bed\u8a00<\/h2>\n
\u5728Kotlin\u4e2d\uff0c\u901a\u8fc7”in”\u4fee\u9970\u7b26\u5b9e\u73b0\u4e86\u9006\u53d8\u3002
\n\u4e0e\u534f\u53d8\u76f8\u53cd\uff0c”in”\u4fee\u9970\u7b26\u53ea\u5141\u8bb8\u8f93\u5165\uff0c\u4e0d\u5141\u8bb8\u8f93\u51fa\u3002<\/p>\n
fun<\/span> main<\/span>(<\/span>args<\/span>:<\/span> Array<\/span><<\/span>String<\/span>>)<\/span> {<\/span>\r\n    var<\/span> hoge<\/span> =<\/span> Hoge<\/span>(<\/span>1<\/span>)<\/span> \r\n    val<\/span> hogeList<\/span>:<\/span> java<\/span>.<\/span>util<\/span>.<\/span>ArrayList<\/span><<\/span>Hoge<\/span>><\/span> =<\/span> arrayListOf<\/span>(<\/span>hoge<\/span>)<\/span>\r\n    val<\/span> fooList<\/span>:<\/span> java<\/span>.<\/span>util<\/span>.<\/span>ArrayList<\/span><<\/span>in<\/span> Foo<\/span>><\/span> =<\/span> hogeList<\/span>  \/\/\u53cd\u5909\u3060\u304b\u3089\u4ee3\u5165\u3067\u304d\u308b<\/span>\r\n\r\n    val<\/span> foo<\/span> =<\/span> fooList<\/span>[<\/span>0<\/span>]<\/span>\r\n\r\n    println<\/span>(<\/span>hoge<\/span> ==<\/span> foo<\/span>)<\/span> \/\/ true<\/span>\r\n    println<\/span>(<\/span>hoge<\/span>.<\/span>a<\/span>)<\/span>  \/\/1\u304c\u51fa\u529b\u3055\u308c\u308b<\/span>\r\n    println<\/span>(<\/span>foo<\/span>.<\/span>a<\/span>)<\/span>  \/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/span>\r\n}<\/span>\r\nopen<\/span> class<\/span> Hoge<\/span>(<\/span>val<\/span> a<\/span>:<\/span> Int<\/span>)<\/span>\r\nclass<\/span> Foo<\/span>:<\/span> Hoge<\/span>(<\/span>0<\/span>)<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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