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在有關繼承的科特林每一個教程中,我見過一個例子是這樣的:科特林構造崩潰
class SubClass(pref : String) {
fun theSubClassMethod() : String {
return "The subclass method"
}
}
但是,如果我用它作爲這樣的,由於某種原因,我得到這個異常:
java.lang.NoClassDefFoundError: Failed resolution of: Lkotlin/jvm/internal/Intrinsics;
at a.b.c.com.logic.SubClass.<init>(SubClass.kt)
at a.b.c.com.kotlinplayground.MainActivity.onCreate(MainActivity.kt:39)
at android.app.Activity.performCreate(Activity.java:6374)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2767)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2879)
at android.app.ActivityThread.access$900(ActivityThread.java:182)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1475)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6141)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
Caused by: java.lang.ClassNotFoundException: Didn't find class "kotlin.jvm.internal.Intrinsics" on path: DexPathList[[zip file "/data/app/a.b.c.com.kotlinplayground-1/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at a.b.c.com.logic.SubClass.<init>(SubClass.kt)
at a.b.c.com.kotlinplayground.MainActivity.onCreate(MainActivity.kt:39)
at android.app.Activity.performCreate(Activity.java:6374)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2767)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2879)
at android.app.ActivityThread.access$900(ActivityThread.java:182)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1475)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6141)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
Suppressed: java.lang.ClassNotFoundException: kotlin.jvm.internal.Intrinsics
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 16 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
我能得到它的工作的唯一辦法是,如果我這樣做:「?」
class SubClass(pref : String?) {
fun theSubClassMethod() : String {
return "The subclass method"
}
}
的通知問號在參數中,沒有它我不能讓代碼工作,但問題是爲什麼?爲什麼它沒有它的工作,以及每個教程如何顯示沒有問號的參數,並且他們沒有提及任何有關它的信息......我錯過了什麼?
這是我使用它的方式:
val subClass = SubClass("ZZZ")
注:如果在構造函數中的參數是一個int /布爾,等它工作正常,似乎只與物體發生。
就是這樣!謝謝......好像Android Studio不包含正確的kotlin依賴關係。 –