{"id":249,"date":"2022-11-28T22:27:58","date_gmt":"2022-12-26T12:29:37","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/kotlin-%e7%b1%bb-kotlin-%e6%9e%84%e9%80%a0%e5%87%bd%e6%95%b0\/"},"modified":"2025-08-01T02:55:10","modified_gmt":"2025-07-31T18:55:10","slug":"kotlin-%e7%b1%bb-kotlin-%e6%9e%84%e9%80%a0%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/kotlin-%e7%b1%bb-kotlin-%e6%9e%84%e9%80%a0%e5%87%bd%e6%95%b0\/","title":{"rendered":"Kotlin \u7c7b\u4e0e\u6784\u9020\u51fd\u6570\uff1a\u6df1\u5165\u7406\u89e3\u4e0e\u5b9e\u8df5"},"content":{"rendered":"

\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bbaKotlin\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u6982\u5ff5\u3002\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecdKotlin\u7c7b\u3002\u6211\u4eec\u8fd8\u5c06\u7814\u7a76Kotlin\u7684\u6784\u9020\u51fd\u6570\u3001\u8bbf\u95ee\u4fee\u9970\u7b26\u548c\u62bd\u8c61\u7c7b\u3002<\/p>\n

Kotlin\u7c7b<\/h2>\n
\"kotlin<\/div>\n
class FirstClass {\r\n}<\/code><\/pre>\n
\u4ee5\u4e0b\u662f\u5982\u4f55\u5b9e\u4f8b\u5316\u8be5\u7c7b\u7684\u793a\u4f8b\uff1a<\/p>\n
val firstClass =  FirstClass()\r\nvar new = FirstClass() \/\/\u8fd9\u91cc\u7684 new \u662f\u53d8\u91cf\u540d\u3002<\/code><\/pre>\n
\u4e0eJava\u4e0d\u540c\uff0cKotlin\u4e2d\u7684new<\/code>\u4e0d\u662f\u4e00\u4e2a\u5173\u952e\u5b57\u3002\u5728Kotlin\u4e2d\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u7c7b\u662ffinal<\/code>\u7684\u3002\u56e0\u6b64\uff0c\u5728Java\u4e2d\uff0c\u4e0a\u8ff0\u5b9a\u4e49\u7684\u7b49\u6548\u65b9\u5f0f\u53ef\u80fd\u7c7b\u4f3c\u4e8e\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n
public final class FirstClass {\r\n}<\/code><\/pre>\n
\u56e0\u6b64\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cKotlin\u4e2d\u7684\u7c7b\u662f\u4e0d\u53ef\u7ee7\u627f\u7684\u3002\u4e3a\u4e86\u4f7f\u4e00\u4e2a\u7c7b\u975efinal<\/code>\uff0c\u6211\u4eec\u9700\u8981\u5728\u5176\u524d\u9762\u52a0\u4e0a\u5173\u952e\u5b57open<\/code>\u3002<\/p>\n
open class Me{\r\n}<\/code><\/pre>\n
open<\/code>\u6ce8\u89e3\u5141\u8bb8\u5176\u4ed6\u7c7b\u7ee7\u627f\u3002<\/p>\n
Kotlin \u7c7b\u793a\u4f8b<\/h3>\n
\u8ba9\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u5e26\u6709\u51e0\u4e2a\u51fd\u6570\u548c\u5c5e\u6027\u7684\u7c7b\u3002\u6211\u4eec\u5c06\u770b\u5230\u5982\u4f55\u8bbf\u95ee\u8be5\u7c7b\u7684\u51fd\u6570\u548c\u5c5e\u6027\u3002\u6b64\u5916\uff0c\u6211\u4eec\u8fd8\u5c06\u770b\u5230\u5982\u4f55\u8bbe\u7f6e\u6210\u5458\u5c5e\u6027\u3002<\/p>\n
class User {\r\n\r\n    var loggedIn: Boolean = false\r\n    val cantChangeValue = \"Hi\"\r\n    \r\n    fun logOn() {\r\n        loggedIn = true\r\n    }\r\n    \r\n    fun logOff() {\r\n        loggedIn = false\r\n    }\r\n}\r\n\r\nfun main(args: Array<String>) {\r\n\r\n    val user = User()\r\n    println(user.loggedIn) \/\/false\r\n    user.logOn()\r\n    println(user.loggedIn) \/\/true\r\n    user.logOff()\r\n    println(user.loggedIn) \/\/false\r\n    user.cantChangeValue = \"Hey\" \/\/\u65e0\u6cd5\u7f16\u8bd1\u3002\u4e0d\u80fd\u4fee\u6539 final \u53d8\u91cf\u3002\r\n\r\n}<\/code><\/pre>\n
main<\/code>\u51fd\u6570\u5c5e\u4e8eTest.kt<\/code>\u6587\u4ef6\u3002\u8981\u8bbf\u95ee\u6210\u5458\u548c\u51fd\u6570\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528\u70b9\u8fd0\u7b97\u7b26\u3002\u4e0d\u80fd\u518d\u4f7f\u7528\u70b9\u8fd0\u7b97\u7b26\u6765\u8bbe\u7f6eval<\/code>\u5c5e\u6027\u3002<\/p>\n
Kotlin\u7684\u521d\u59cb\u5316<\/h3>\n
Kotlin\u7684init<\/code>\u5757\u5b9a\u4e49\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
class User {\r\n    \r\n    init{\r\n        print(\"Class instance is initialised.\")\r\n    }\r\n\r\n    var loggedIn: Boolean = false\r\n    val cantChangeValue = \"Hi\"\r\n\r\n    fun logOn() {\r\n        loggedIn = true\r\n    }\r\n\r\n    fun logOff() {\r\n        loggedIn = false\r\n    }\r\n}<\/code><\/pre>\n
\u5f53\u7c7b\u5b9e\u4f8b\u5316\u65f6\uff0cinit<\/code>\u5757\u4e2d\u7684\u4ee3\u7801\u5c06\u9996\u5148\u6267\u884c\u3002\u6bcf\u6b21\u5b9e\u4f8b\u5316\u7c7b\u65f6\uff0cinit<\/code>\u5757\u90fd\u4f1a\u8fd0\u884c\uff0c\u65e0\u8bba\u4f7f\u7528\u4ec0\u4e48\u6837\u7684\u6784\u9020\u51fd\u6570\uff0c\u4e0b\u9762\u6211\u4eec\u5c06\u770b\u5230\u3002\u4e00\u4e2a\u7c7b\u4e2d\u53ef\u4ee5\u7f16\u5199\u591a\u4e2a\u521d\u59cb\u5316\u5757\u3002\u5b83\u4eec\u5c06\u6309\u7167\u4e0b\u9762\u7684\u987a\u5e8f\u4f9d\u6b21\u6267\u884c\u3002<\/p>\n
class MultiInit(name: String) {\r\n\r\n    init {\r\n        println(\"First initializer block that prints ${name}\")\r\n    }\r\n\r\n    init {\r\n        println(\"Second initializer block that prints ${name.length}\")\r\n    }\r\n}\r\n\r\nfun main(args: Array<String>) {\r\n    var multiInit = MultiInit(\"Kotlin\")\r\n}\r\n\r\n\/\/\u4ee5\u4e0b\u5185\u5bb9\u6253\u5370\u5728\u65e5\u5fd7\u63a7\u5236\u53f0\u4e2d\u3002\r\n\/\/First initializer block that prints Kotlin\r\n\/\/Second initializer block that prints 6<\/code><\/pre>\n
\u4f7f\u7528\u4e0b\u9762\u6240\u793a\u7684also<\/code>\u51fd\u6570\uff0cKotlin \u7c7b\u53ef\u4ee5\u5728\u58f0\u660e\u672c\u8eab\u4e2d\u6253\u5370\u5c5e\u6027\u3002<\/p>\n
class MultiInit(name: String) {\r\n    val firstProperty = \"First property: $name\".also(::println)\r\n\r\n    init {\r\n        println(\"First initializer block that prints ${name}\")\r\n    }\r\n\r\n    val secondProperty = \"Second property: ${name.length}\".also(::println)\r\n\r\n    init {\r\n        println(\"Second initializer block that prints ${name.length}\")\r\n    }\r\n}\r\n\r\nfun main(args: Array<String>) {\r\n\r\n    var multiInit = MultiInit(\"Kotlin\")\r\n}\r\n\r\n\/\/\u4ee5\u4e0b\u5185\u5bb9\u88ab\u6253\u5370\u3002\r\n\/\/First property: Kotlin\r\n\/\/First initializer block that prints Kotlin\r\n\/\/Second property: 6\r\n\/\/Second initializer block that prints 6<\/code><\/pre>\n
Kotlin \u6784\u9020\u51fd\u6570<\/h2>\n
Kotlin\u7684\u6784\u9020\u51fd\u6570\u662f\u7528\u4e8e\u521d\u59cb\u5316\u5c5e\u6027\u7684\u7279\u6b8a\u6210\u5458\u51fd\u6570\u3002\u4e0eJava\u76f8\u6bd4\uff0cKotlin\u7684\u6784\u9020\u51fd\u6570\u7684\u7f16\u5199\u548c\u7ed3\u6784\u6709\u6240\u4e0d\u540c\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u4e00\u4e2a\u7c7b\u5177\u6709\u4ee5\u4e0b\u7a7a\u6784\u9020\u51fd\u6570\uff1a<\/p>\n
class Student {\r\n    var name: String\r\n    val age : Int\r\n\r\n    init {\r\n        name = \"Anupam\"\r\n        age = 24\r\n    }\r\n\r\n    init {\r\n        name = \"Anupam Chugh\"\r\n        \/\/age = 26\r\n    }\r\n}\r\n\r\nfun main(args: Array<String>) {\r\n    \r\n    val student = Student()\r\n    println(\"${student.name} age is ${student.age}\")\r\n    student.name = \"Your\"\r\n    \/\/student.age = 26 \/\/\u65e0\u6cd5\u7f16\u8bd1\u3002age \u662f val\r\n    println(\"${student.name} age is ${student.age}\")\r\n\r\n}\r\n\r\n\/\/\u4ee5\u4e0b\u5185\u5bb9\u6253\u5370\u5728\u63a7\u5236\u53f0\u4e0a\uff1a\r\n\/\/Anupam Chugh age is 24\r\n\/\/Your age is 24<\/code><\/pre>\n
\u4e3b\u6784\u9020\u51fd\u6570<\/h3>\n
Kotlin\u4e2d\u7684\u4e3b\u6784\u9020\u51fd\u6570\u662f\u5728\u7c7b\u5934\u4e2d\u5b9a\u4e49\u7684\uff0c\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
class User(var name: String, var isAdmin: Boolean) {\r\n\r\n    init {\r\n        name = name + \" @ JournalDev.com\"\r\n        println(\"Author Name is $name. Is Admin? $isAdmin\")\r\n    }\r\n}<\/code><\/pre>\n
\u4e3b\u6784\u9020\u51fd\u6570\u5b9a\u4e49\u5728\u7c7b\u5934\u90e8\u3002\u6211\u4eec\u5df2\u7ecf\u5728\u6784\u9020\u51fd\u6570\u672c\u8eab\u4e2d\u5b9a\u4e49\u4e86\u5c5e\u6027\u7c7b\u578b\uff08val<\/code>\/var<\/code>\uff09\u3002\u6ce8\u610f\uff1a\u9664\u975e\u58f0\u660e\u4e3avar<\/code>\uff0c\u5426\u5219\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u6784\u9020\u51fd\u6570\u53c2\u6570\u662fval<\/code>\u3002<\/p>\n
class User(name: String, isAdmin: Boolean)<\/code><\/pre>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u65e0\u6cd5\u91cd\u65b0\u5206\u914dname<\/code>\u548cisAdmin<\/code>\u3002\u6216\u8005\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u5c06\u6784\u9020\u51fd\u6570\u7684\u53c2\u6570\u5206\u914d\u7ed9\u7c7b\u4e2d\u7684\u6210\u5458\u5c5e\u6027\uff0c\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
class User(name: String, val isAdmin: Boolean) {\r\n\r\n    var username  = name\r\n    val _isAdmin = isAdmin\r\n\r\n    init {\r\n        username= username + \" @ JournalDev.com\"\r\n        println(\"Author Name is $name. Is Admin? $_isAdmin\")\r\n    }\r\n}\r\n\r\nfun main(args: Array<String>) {\r\n\r\n    var user = User(\"Anupam\",false)\r\n    user.isAdmin = true \/\/\u65e0\u6cd5\u7f16\u8bd1\uff0c\u56e0\u4e3a isAdmin \u662f val\r\n    user._isAdmin = true \/\/\u65e0\u6cd5\u7f16\u8bd1\u3002\u539f\u56e0\u76f8\u540c\u3002\r\n    user = User(\"Pankaj\",true)\r\n}\r\n\r\n\/\/\u4ee5\u4e0b\u5185\u5bb9\u6253\u5370\u5728\u65e5\u5fd7\u63a7\u5236\u53f0\u4e2d\u3002\r\n\/\/Author Name is Anupam. Is Admin? false\r\n\/\/Author Name is Pankaj. Is Admin? true<\/code><\/pre>\n
Kotlin \u6784\u9020\u51fd\u6570\u7684\u9ed8\u8ba4\u503c<\/h3>\n
\u5728Kotlin\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u6784\u9020\u51fd\u6570\u672c\u8eab\u4e2d\u6307\u5b9a\u9ed8\u8ba4\u503c\uff0c\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
class User(name: String, var website: String = \"JournalDev\") {\r\n\r\n    init {\r\n        println(\"Author $name writes at $website\")\r\n    }\r\n\r\n    init {\r\n        website = website + \".com\"\r\n        println(\"Author $name writes at $website\")\r\n    }\r\n}\r\n\r\nfun main(args: Array<String>) {\r\n\r\n    var user = User(\"Anupam\",\"JournalDev\")\r\n    user = User(\"Pankaj\",\"JournalDev\")\r\n}\r\n\r\n\/\/ \u4ee5\u4e0b\u5185\u5bb9\u6253\u5370\u5728\u63a7\u5236\u53f0\uff1a\r\n\/\/ Author Anupam writes at JournalDev\r\n\/\/ Author Anupam writes at JournalDev.com\r\n\/\/ Author Pankaj writes at JournalDev\r\n\/\/ Author Pankaj writes at JournalDev.com\r\n<\/code><\/pre>\n
\u6b21\u6784\u9020\u51fd\u6570<\/h3>\n
\u5728\u7c7b\u7684\u4e3b\u4f53\u4e2d\uff0c\u901a\u8fc7\u5728\u6784\u9020\u51fd\u6570\u524d\u6dfb\u52a0constructor<\/code>\u5173\u952e\u5b57\u6765\u7f16\u5199\u6b21\u6784\u9020\u51fd\u6570\u3002\u4ee5\u4e0b\u793a\u4f8b\u6f14\u793a\u4e86\u8fd9\u4e00\u70b9\u3002<\/p>\n
class Student {\r\n    var name: String\r\n    val age : Int\r\n\r\n    constructor(name: String, age: Int)\r\n    {\r\n        this.name = name\r\n        this.age = age\r\n    }\r\n\r\n    fun printDetails()\r\n    {\r\n        println(\"Name is $name and Age is $age\")\r\n    }\r\n\r\n}\r\n\r\nfun main(args: Array<String>) {\r\n\r\n    var student = Student(\"Anupam\", 24)\r\n    student.printDetails()\r\n}\r\n\r\n\/\/ \u4ee5\u4e0b\u5185\u5bb9\u6253\u5370\u5728\u63a7\u5236\u53f0\uff1a\r\n\/\/ Name is Anupam and Age is 24\r\n<\/code><\/pre>\n
\u5728\u5b50\u7c7b\u4e2d\uff0c\u6b21\u6784\u9020\u51fd\u6570\u6700\u5e38\u89c1\u7684\u7528\u9014\u662f\u5728\u9700\u8981\u4ee5\u4e0d\u540c\u65b9\u5f0f\u521d\u59cb\u5316\u7c7b\u65f6\u4f7f\u7528\u3002\u5982\u679c\u8be5\u7c7b\u5305\u542b\u4e00\u4e2a\u4e3b\u6784\u9020\u51fd\u6570\uff0c\u6b21\u6784\u9020\u51fd\u6570\u5fc5\u987b\u5728\u5176\u58f0\u660e\u4e2d\u5f15\u7528\u4e3b\u6784\u9020\u51fd\u6570\u3002\u4f7f\u7528\u5173\u952e\u5b57\u201cthis<\/code>\u201d\u6765\u8fdb\u884c\u5f15\u7528\u3002<\/p>\n
class Student(var name: String, val age: Int) {\r\n\r\n    var skill: String\r\n\r\n    init {\r\n        skill = \"NA\"\r\n    }\r\n\r\n    constructor(name: String, age: Int, skill: String) : this(name, age) {\r\n        this.skill = skill\r\n    }\r\n\r\n    fun printDetails() {\r\n        if (skill.equals(\"NA\"))\r\n            println(\"Name is $name and Age is $age\")\r\n        else\r\n            println(\"Name is $name and Age is $age Skill is $skill\")\r\n    }\r\n}\r\n\r\n\/\/ \u4ee5\u4e0b\u5185\u5bb9\u6253\u5370\u5728\u65e5\u5fd7\u63a7\u5236\u53f0\uff1a\r\n\/\/ Name is Anupam and Age is 24\r\n\/\/ Name is Anupam and Age is 24 Skill is Kotlin\r\n<\/code><\/pre>\n
\u521d\u59cb\u5316\u5757\u7528\u4e8e\u521d\u59cb\u5316\u6210\u5458\u5c5e\u6027skill<\/code>\u3002\u6b21\u6784\u9020\u51fd\u6570\u4f7f\u7528\u201cthis<\/code>\u201d\u5173\u952e\u5b57\u59d4\u6258\u7ed9\u4e3b\u6784\u9020\u51fd\u6570\u3002<\/p>\n
\u81ea\u5b9a\u4e49\u7684\u83b7\u53d6\u5668\u548c\u8bbe\u7f6e\u5668<\/h3>\n
\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u6211\u4eec\u901a\u8fc7\u5bf9\u7c7b\u7684\u5b9e\u4f8b\u4f7f\u7528\u70b9\u8fd0\u7b97\u7b26\u6765\u8bbf\u95ee\u548c\u4fee\u6539\u5c5e\u6027\u3002\u8ba9\u6211\u4eec\u4f7f\u7528set<\/code>\u548cget<\/code>\u8bed\u6cd5\u6765\u770b\u770b\u5982\u4f55\u81ea\u5b9a\u4e49\u8bbf\u95ee\u3002<\/p>\n
class Name{\r\n    var post: String = \"default\"\r\n    set(value) {if(!post.isNotEmpty()) {\r\n        throw IllegalArgumentException(\" Enter a valid name\")\r\n    }\r\n                field = value\r\n                print(value)\r\n    }\r\n\r\n}\r\n\r\nfun main(args: Array<String>) {\r\n\r\n    var name = Name()\r\n    name.post = \"Kotlin Classes\"\r\n    name.post = \"\"\r\n    name.post = \"Kotlin Data Classes Our Next Tutorial\"\r\n\r\n\r\n}\r\n<\/code><\/pre>\n
\u4ee5\u4e0b\u5185\u5bb9\u6253\u5370\u5728\u65e5\u5fd7\u63a7\u5236\u53f0\uff1a<\/p>\n
Kotlin Classes\r\n\r\nException in thread \"main\" java.lang.IllegalArgumentException:  Enter a valid name\r\n\tat Name.setPost(Test.kt:16)\r\n\tat TestKt.main(Test.kt:78)\r\n<\/code><\/pre>\n
\u5728\u8bbe\u7f6e\u5668\uff08setter\uff09\u4e2d\uff0cfield<\/code>\u53d8\u91cf\u4fdd\u5b58\u4e86\u65e7\u503c\u3002\u8ba9\u6211\u4eec\u6dfb\u52a0\u4e00\u4e2a\u83b7\u53d6\u5668\uff08getter\uff09\u3002<\/p>\n
class Name{\r\n    var post: String = \"default\"\r\n    set(value) {if(!post.isNotEmpty()) {\r\n        throw IllegalArgumentException(\" Enter a valid name\")\r\n    }\r\n                field = value\r\n    }\r\n    get() {\r\n        return field.capitalize()\r\n    }\r\n\r\n}\r\n\r\nfun main(args: Array<String>) {\r\n\r\n    var name = Name()\r\n    name.post = \"kotlin classes\"\r\n    println(name.post)\r\n    name.post = \"kotlin data Classes our next Tutorial\"\r\n    println(name.post)\r\n\r\n}\r\n\r\n\/\/ \u4ee5\u4e0b\u5185\u5bb9\u6253\u5370\uff1a\r\n\/\/ Kotlin classes\r\n\/\/ Kotlin data Classes our next Tutorial\r\n<\/code><\/pre>\n
capitalize()<\/code>\u65b9\u6cd5\u5c06\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u5b57\u6bcd\u5927\u5199\u3002\u6ce8\u610f\uff1a\u5982\u679c\u5c5e\u6027\u662fval<\/code>\uff0c\u5219\u8bbe\u7f6e\u65b9\u6cd5\u5c06\u65e0\u6cd5\u7f16\u8bd1\u901a\u8fc7\u3002<\/p>\n
Kotlin \u53ef\u89c1\u6027\u4fee\u9970\u7b26<\/h2>\n
    \n
  • Public\uff08\u516c\u5171\uff09<\/strong>\uff1a\u4efb\u4f55\u5e26\u6709\u6b64\u4fee\u9970\u7b26\u7684\u7c7b\u3001\u51fd\u6570\u3001\u5c5e\u6027\u3001\u63a5\u53e3\u6216\u5bf9\u8c61\u90fd\u662f\u53ef\u89c1\u7684\uff0c\u5e76\u4e14\u53ef\u4ee5\u4ece\u4efb\u4f55\u5730\u65b9\u8bbf\u95ee\u3002<\/li>\n
  • Private\uff08\u79c1\u6709\uff09<\/strong>\uff1a\u4f7f\u7528\u6b64\u4fee\u9970\u7b26\u5b9a\u4e49\u7684\u7c7b\/\u51fd\u6570\u53ea\u80fd\u5728\u540c\u4e00\u6587\u4ef6\u5185\u8bbf\u95ee\u3002\u7c7b\/\u51fd\u6570\u4e2d\u5e26\u6709\u6b64\u4fee\u9970\u7b26\u7684\u6210\u5458\/\u5c5e\u6027\u53ea\u80fd\u5728\u8be5\u5757\u5185\u8bbf\u95ee\u3002<\/li>\n
  • Protected\uff08\u53d7\u4fdd\u62a4\uff09<\/strong>\uff1a\u6b64\u4fee\u9970\u7b26\u4e0eprivate<\/code>\u76f8\u540c\uff0c\u4f46\u5b83\u5141\u8bb8\u5728\u5b50\u7c7b\u4e2d\u53ef\u89c1\u548c\u8bbf\u95ee\u3002<\/li>\n
  • Internal\uff08\u5185\u90e8\uff09<\/strong>\uff1a\u5e26\u6709\u6b64\u4fee\u9970\u7b26\u7684\u7c7b\/\u63a5\u53e3\/\u51fd\u6570\u53ea\u80fd\u5728\u540c\u4e00\u6a21\u5757\u5185\u8bbf\u95ee\u3002<\/li>\n<\/ul>\n
    \u53ef\u89c1\u6027\u4fee\u9970\u7b26\u540c\u6837\u9002\u7528\u4e8e\u6784\u9020\u51fd\u6570\u3002\u5c06\u4fee\u9970\u7b26\u5206\u914d\u7ed9\u4e3b\u6784\u9020\u51fd\u6570\u9700\u8981\u5728\u7c7b\u5934\u4e2d\u7684constructor<\/code>\u5173\u952e\u5b57\u65c1\u6307\u5b9a\u4fee\u9970\u7b26\u3002<\/p>\n
    class Student private constructor (var name: String, val age: Int) {\r\n\r\n    var skill: String\r\n\r\n    init {\r\n        skill = \"NA\"\r\n    }\r\n\r\n    constructor(name: String, age: Int, skill: String) : this(name, age) {\r\n        this.skill = skill\r\n    }\r\n\r\n    fun printDetails() {\r\n        if (skill.equals(\"NA\"))\r\n            println(\"Name is $name and Age is $age\")\r\n        else\r\n            println(\"Name is $name and Age is $age Skill is $skill\")\r\n    }\r\n}\r\n\r\nfun main(args: Array<String>) {\r\n\r\n    var student = Student(\"Anupam\",24,\"Kotlin\")\r\n    student.printDetails()\r\n}\r\n\r\n\/\/ \u6253\u5370\uff1a\r\n\/\/ Name is Anupam and Age is 24 Skill is Kotlin\r\n<\/code><\/pre>\n
    \u79c1\u6709\u6784\u9020\u51fd\u6570\u4e0d\u80fd\u5728\u7c7b\u5916\u90e8\u8c03\u7528\u3002\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u53ea\u80fd\u4f7f\u7528\u8f85\u52a9\u6784\u9020\u51fd\u6570\u5728\u4e0d\u540c\u7684\u51fd\u6570\u4e2d\u5b9e\u4f8b\u5316\u8be5\u7c7b\u3002<\/p>\n
    Kotlin\u7684\u62bd\u8c61\u7c7b<\/h2>\n
    \u4e0eJava\u7c7b\u4f3c\uff0cKotlin\u4e2d\u4f7f\u7528abstract<\/code>\u5173\u952e\u5b57\u6765\u58f0\u660e\u62bd\u8c61\u7c7b\u3002\u62bd\u8c61\u7c7b\u4e0d\u80fd\u88ab\u5b9e\u4f8b\u5316\uff0c\u4f46\u53ef\u4ee5\u88ab\u5b50\u7c7b\u7ee7\u627f\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u62bd\u8c61\u7c7b\u7684\u6210\u5458\u90fd\u662f\u975e\u62bd\u8c61\u7684\uff0c\u9664\u975e\u53e6\u6709\u58f0\u660e\u3002<\/p>\n
    abstract class Person(name: String) {\r\n\r\n    init {\r\n        println(\"\u62bd\u8c61\u7c7b. \u521d\u59cb\u5316\u5757. \u4eba\u5458\u59d3\u540d\u662f $name\")\r\n    }\r\n\r\n    abstract fun displayAge()\r\n}\r\n\r\nclass Teacher(name: String): Person(name) {\r\n\r\n    var age : Int\r\n\r\n    init {\r\n        age = 24\r\n    }\r\n\r\n    override fun displayAge() {\r\n        println(\"\u975e\u62bd\u8c61\u7c7b\u91cd\u5199\u4e86 displayAge \u51fd\u6570. \u5e74\u9f84\u662f $age\")\r\n    }\r\n}\r\n\r\nfun main(args: Array<String>) {\r\n\r\n    val person = Teacher(\"Anupam\")\r\n    person.displayAge()\r\n\r\n}\r\n\r\n\/\/ \u4ee5\u4e0b\u5185\u5bb9\u5c06\u6253\u5370\u5728\u63a7\u5236\u53f0\uff1a\r\n\/\/ \u62bd\u8c61\u7c7b. \u521d\u59cb\u5316\u5757. \u4eba\u5458\u59d3\u540d\u662f Anupam\r\n\/\/ \u975e\u62bd\u8c61\u7c7b. \u5e74\u9f84\u662f 24\r\n<\/code><\/pre>\n
    \u8bf7\u6ce8\u610f\uff1a\u62bd\u8c61\u7c7b\u5728 Kotlin \u4e2d\u9ed8\u8ba4\u662f\u5f00\u653e\u7684\uff08open\uff09\uff0c\u56e0\u6b64\u65e0\u9700\u989d\u5916\u6dfb\u52a0 open<\/code> \u4fee\u9970\u7b26\u5373\u53ef\u5141\u8bb8\u5176\u4ed6\u7c7b\u7ee7\u627f\u3002override<\/code> \u5173\u952e\u5b57\u7528\u4e8e\u5728\u5b50\u7c7b\u4e2d\u91cd\u5199\u7236\u7c7b\u7684\u65b9\u6cd5\u3002\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5df2\u7ecf\u6db5\u76d6\u4e86 Kotlin \u7c7b\u7684\u57fa\u7840\u77e5\u8bc6\u3002Kotlin \u8fd8\u5305\u542b\u8bb8\u591a\u5176\u4ed6\u9ad8\u7ea7\u7279\u6027\uff0c\u4f8b\u5982\u6570\u636e\u7c7b\uff08data class\uff09\u3001\u5bc6\u5c01\u7c7b\uff08sealed class\uff09\u3001\u7ee7\u627f\uff08inheritance\uff09\u7b49\u3002\u6211\u4eec\u5c06\u5728\u540e\u7eed\u6559\u7a0b\u4e2d\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u5185\u5bb9\u3002\u53c2\u8003\u8d44\u6599\uff1aKotlin \u5b98\u65b9\u6587\u6863\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bbaKotlin\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u6982\u5ff5\u3002\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecdKotlin\u7c7b\u3002\u6211\u4eec\u8fd8\u5c06\u7814\u7a76Kotlin\u7684 […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[897,920,753,259,921],"class_list":["post-249","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-kotlin","tag-920","tag-753","tag-259","tag-921"],"yoast_head":"\nKotlin \u7c7b\u4e0e\u6784\u9020\u51fd\u6570\uff1a\u6df1\u5165\u7406\u89e3\u4e0e\u5b9e\u8df5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u672c\u6559\u7a0b\u6df1\u5165\u63a2\u8ba8Kotlin\u4e2d\u7684\u7c7b\u548c\u6784\u9020\u51fd\u6570\uff0c\u5305\u62ec\u4e3b\u6784\u9020\u51fd\u6570\u3001\u6b21\u6784\u9020\u51fd\u6570\u3001\u521d\u59cb\u5316\u5757\u4ee5\u53ca\u5c5e\u6027\u58f0\u660e\uff0c\u52a9\u60a8\u5168\u9762\u638c\u63e1Kotlin\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u6838\u5fc3\u6982\u5ff5\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/kotlin-\u7c7b-kotlin-\u6784\u9020\u51fd\u6570\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Kotlin \u7c7b\u4e0e\u6784\u9020\u51fd\u6570\uff1a\u6df1\u5165\u7406\u89e3\u4e0e\u5b9e\u8df5\" \/>\n<meta property=\"og:description\" content=\"\u672c\u6559\u7a0b\u6df1\u5165\u63a2\u8ba8Kotlin\u4e2d\u7684\u7c7b\u548c\u6784\u9020\u51fd\u6570\uff0c\u5305\u62ec\u4e3b\u6784\u9020\u51fd\u6570\u3001\u6b21\u6784\u9020\u51fd\u6570\u3001\u521d\u59cb\u5316\u5757\u4ee5\u53ca\u5c5e\u6027\u58f0\u660e\uff0c\u52a9\u60a8\u5168\u9762\u638c\u63e1Kotlin\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u6838\u5fc3\u6982\u5ff5\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/kotlin-\u7c7b-kotlin-\u6784\u9020\u51fd\u6570\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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