Obiect reference not set to an instance of an object

引用中的代码片段展示了一个重载运算符"=="的实现，用于比较两个Test24对象。在该实现中，首先判断t2对象是否为null，如果是则判断t1对象是否也为null，如果是则返回true，否则调用t2对象的Equals方法来比较t1对象。而引用中的代码是一个Test24类的示例，其中重载了"=="和"!="运算符，以及实现了GetHashCode和Equals方法。在MyFun方法中，创建了一个Test24对象t，并使用"=="运算符来比较t是否为null，根据结果输出对应的信息。根据代码逻辑，由于t是一个实例化的对象，所以输出"t不为空"。
而引用中的代码片段是关于配置文件的修改，通过修改exe.config文件中的数据库连接字符串的name属性为"ConnectToDB"，在代码中使用该名称来获取连接字符串，并解决了"Object reference not set to an instance of an object"的问题。

相关问题

java.lang.NullPointerException: Attempt to invoke virtual method int android.speech.tts.Te xtToSpeech.setLanguage(iava.util.Locale)on a null obiect reference at com.delta.android.AMS.Client.MessageReceive rService$2.onlnit(MessageReceiverService.java :190) at android.speechtts.TextToSpeech.lambda$disp atchOnlnit$O$TextToSpeech(TextToSpeech.jav a:890) at android.speech.tts.TextToSpeech$ $ExternalSyntheticLambda17.run(Unknown Source:4) at android.speech.tts.TextToSpeech.dispatchOnln it(TextToSpeech.java:899) at android.speech.tts.TextToSpeech.access$900( TextToSpeech.java:79) at android.speechtts.TextToSpeech$Connection$ SetupConnectionAsyncTask.onPostExecute(Tex tToSpeech.iava:2280) at android.speech.tts.TextToSpeech$Connection$ SetupConnectionAsvncTask.onPostExecute(Tex tToSpeechiava:2240) at android.os.AsyncTask.finish(AsyncTask.java:771) at RESTART APP

这是一个关于 Android 中 TextToSpeech 的 NullPointerException 异常，在 MessageReceiverService.java 文件的第 190 行尝试对一个 null 对象进行方法调用。这可能是因为 TextToSpeech 没有正确初始化导致的。建议检查初始化代码，确保 TextToSpeech 对象不为 null。另外，重启应用可能有助于解决问题。

FormInfo class FormInfo <<partial>> [ +Formlnfo0- button1 Click(sender:obiect, e:EventArgs) : void+ SetText(run:double, walk:double) : void Form <-- FormInfo Common class Common!+ static) map left lon : double +{static) map top lat : double +{static map right lon : double +{static' map bottom lat : double class Station { +longitute :double <<get>> <<set> >+latitude :double <<get> > <<set>> + staionname :string <<get>> <<set>> + stationlD :int <<get> > <<set>> + address :string <<get>> <<set> > + totalDocks :int <<get> > <<set> > + docksln :int <<get> > < <set> > + status : string <<get> > < <set> > Station-->"screenPoint"Point Form1 class Form1 <<partial>> !-imgH:int- imgW :int isStartSite : bool isEndSite : boolI startIndex :int- endIndex :int - isPlanRoute : bool = false- m distance : double = 0 +Form10 Form1 Shown(sender:obiect,e:EventArgs) : void panelRight SizeChanged(sender:obiect,e:EventArgs): void panelButtom SizeChanged(sender:object, e:EventArgs) : voidForm1 Paint(sender:object, e:PaintEventArgs) : void buttonlmport Click(sender:object, e:EventArgs) : void Import(fileName:string): void GPSToScreen(lon:double.lat:double): PointGetTitude(point:Point): doubel listStations SelectedlndexChanged(sender:obiect, e:EventArgs) : void panel2 Paint(sender:object, e:PaintEventArgs) : voidcheckAll Click(sender:obiect, e:EventArgs) : void comboBox1 SelectedndexChanged(sender:obiect.e:EventAras): voioDrawReqularPoly(x:float, y:float, radius:double, sideCount:int) : PointF panelMouse Paint(sender:obiect,e:PaintEventArgs) : void panelMouse MouseMove(sender:object, e:MouseEventArgs) : voidpanelMouse MouseClick(sender:object, e:MouseEventArgs) : voidbutton1 Click(sender:object, e:EventArgs) : void setRoute0:void - setWalkRoute() : void - comboBox1 TextChanged(sender:object, e:EventArgs) : void class"List1"<T>{ MapHelper class MapHelper!<<const>> EarthRadius : double = 6378.137Istatic' Rad(d:double) : double +Istatic' GetDistance(firstLatitude:double.firstLongitude:double, secondLatitude:doublesecondLongitude:double): double+Istatic1 GetPointDistance(firstPoint:string,secondPoint:string): double Form <-- Form1 Form1-->"allstation<Station>""List1"Form1-->"startPoint"Point Form1-->"endPoint"Point Form1-->"startList<PointFI>""List1" "routeList<PointFIl>""List1Form1-->Form1-->"endList<PointFIl>""List1"Form1-->"m formlnfo"FormInfo画类图

根据提供的信息，可以绘制以下类图：

+-----------------------------------+
|            FormInfo               |
+-----------------------------------+
| +Formlnfo0- button1 Click(...)    |
| +SetText(run:double, walk:double) |
+-----------------------------------+

+-----------------------------+
|            Form             |
+-----------------------------+
| <-- FormInfo                |
+-----------------------------+

+-----------------------------+
|           Common            |
+-----------------------------+
| +{static} map left lon      |
| +{static} map top lat       |
| +{static} map right lon     |
| +{static} map bottom lat    |
+-----------------------------+

+-----------------------------+
|          Station            |
+-----------------------------+
| +longitude : double         |
| +latitude : double          |
| +stationname : string       |
| +stationlD : int            |
| +address : string           |
| +totalDocks : int           |
| +docksln : int              |
| +status : string            |
| --> "screenPoint" Point     |
+-----------------------------+

+-----------------------------+
|          Form1              |
+-----------------------------+
| <-- FormInfo                |
| - imgH: int                 |
| - imgW: int                 |
| - isStartSite: bool         |
| - isEndSite: bool           |
| - startIndex: int           |
| - endIndex: int             |
| - isPlanRoute: bool = false |
| - m distance: double = 0    |
| +Form10                     |
| +Form1 Shown(...)           |
| +panelRight SizeChanged(...)|
| +panelButtom SizeChanged(...)|
| +Form1 Paint(...)           |
| +buttonlmport Click(...)    |
| +Import(fileName:string)    |
| +GPSToScreen(lon:double, lat:double): Point |
| +GetTitude(point:Point): double |
| +listStations SelectedlndexChanged(...) |
| +panel2 Paint(...)          |
| +checkAll Click(...)        |
| +comboBox1 SelectedndexChanged(...) |
| +DrawReqularPoly(...)       |
| +panelMouse Paint(...)      |
| +panelMouse MouseMove(...)  |
| +panelMouse MouseClick(...) |
| +button1 Click(...)         |
| - setRoute0:void            |
| - setWalkRoute() : void     |
| - comboBox1 TextChanged(...)|
+-----------------------------+

+-----------------------------+
|          List1<T>           |
+-----------------------------+

+-----------------------------+
|        MapHelper             |
+-----------------------------+
| <<const>> EarthRadius: double = 6378.137 |
| +static Rad(d: double): double         |
| +static GetDistance(firstLatitude: double, firstLongitude: double, secondLatitude: double, secondLongitude: double): double |
| +static GetPointDistance(firstPoint: string, secondPoint: string): double |
+-----------------------------+

请注意，这只是根据提供的信息绘制的大致类图，可能会有一些缺失或错误。