Question

说我有一些引用的表达式

'(b (a (c 1 3) 2))

我想用一些值替换最后一个括号

'(b (a (c 1 3) 2) e)

做到这一点的最佳方法是什么？我应该先将其转换为字符串，然后将其翻转，然后应用替换优先，然后将其翻转回吗？还是有一种更有效的方法来实现这一目标？

Answer 1

Caused by: java.lang.RuntimeException: Cannot create an instance of class com.contedevel.timetable.model.TimetableViewModel
        at android.arch.lifecycle.ViewModelProvider$AndroidViewModelFactory.create(ViewModelProvider.java:201)
        at android.arch.lifecycle.ViewModelProvider.get(ViewModelProvider.java:134)
        at android.arch.lifecycle.ViewModelProvider.get(ViewModelProvider.java:102)
        at com.contedevel.timetable.activity.MainActivity.onCreate(MainActivity.kt:187)
        at android.app.Activity.performCreate(Activity.java:6757)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2702)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2810) 
        at android.app.ActivityThread.-wrap12(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1528) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:154) 
        at android.app.ActivityThread.main(ActivityThread.java:6312) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762) 
     Caused by: java.lang.NoSuchMethodException: <init> [class android.app.Application]
        at java.lang.Class.getConstructor0(Class.java:2204)
        at java.lang.Class.getConstructor(Class.java:1683)
        at android.arch.lifecycle.ViewModelProvider$AndroidViewModelFactory.create(ViewModelProvider.java:199)
        at android.arch.lifecycle.ViewModelProvider.get(ViewModelProvider.java:134) 
        at android.arch.lifecycle.ViewModelProvider.get(ViewModelProvider.java:102) 
        at com.contedevel.timetable.activity.MainActivity.onCreate(MainActivity.kt:187) 
        at android.app.Activity.performCreate(Activity.java:6757) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2702) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2810) 
        at android.app.ActivityThread.-wrap12(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1528) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:154) 
        at android.app.ActivityThread.main(ActivityThread.java:6312) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)

如何替换带引号的表达式中子字符串的最后一个实例

1 个答案: