1. “null cannot be cast to non-null type”错误的含义 “null cannot be cast to non-null type”这个错误发生在尝试将一个null值强制转换为非空类型时。在Kotlin中,所有变量默认都是非空的,除非明确声明为可空类型(使用?后缀)。如果在运行时尝试将一个null值赋给一个非空类型的变量,就会发生这个错误。
null as Map<String, String>? 如果要将这个变量赋值给一个Map<String, String>,编译时依然不会出错,但在运行时,则将出现一个非常难以debug的问题: java.lang.NullPointerException: null cannot be cast to non-null type kotlin.collections.MutableMap<kotlin.String, kotlin.String> 如图所示:编辑...
I upgraded to 2.1.0 from 2.0.8 and get this exception now at startup. Caused by: java.lang.NullPointerException: null cannot be cast to non-null type java.time.Duration at com.github.jasync.r2dbc.mysql.MysqlConnectionFactoryProvider.create(MysqlConnectionFactoryProvider.kt:77) at com.github...
Caused by: kotlin.TypeCastException: null cannot be cast to non-null type android.view.ViewGroup at com.guoxiaoxing.phoenix.picker.util.ToolbarUtil.setRootView(ToolbarUtil.kt:38) at com.guoxiaoxing.phoenix.picker.util.ToolbarUtil.setColo...
} false``` If someone needs the error message, please tell me 来源:https://stackoverflow.com/questions/68534324/java-lang-nullpointerexception-null-cannot-be-cast-to-non-null-type-android-web 关注 举报暂无答案! 目前还没有任何答案,快来回答吧! 我来回答 ...
TotalPrice有值,会导致GrossAmount也为null --即NULL+任何数字都会是NULL --NULL不能和任何字段比较和...
UPDATE dbo.PayPalPaymentInfo SET GrossAmount=TotalPrice+TaxAmount WHERE GrossAmount IS NULL --如果TaxAmount为NUll时,TotalPrice有值,会导致GrossAmount也为null --即NULL+任何数字都会是NULL --NULL不能和任何字段比较和运算 UPDATE dbo.PayPalPaymentInfo SET GrossAmount=TotalPrice+ISNULL(TaxAm ...
expression non-zero", it means "is my expression non-false". As int* is not convertible to boolean, we cannot adequately answer that question. (It could be argued that int* /should/ be convertible to boolean, but as I try to avoid using pointers as much as possible, I have no ...
MoveToDropIndexOption MultiPartIdentifier MultiPartIdentifierCallTarget NamedTableReference NameFileDeclarationOption NextValueForExpression NonTransactedFileStreamAccess NullableConstraintDefinition NullIfExpression NullLiteral NullNotNull NumericLiteral OdbcConvertSpecification OdbcFunctionCall OdbcLiteral OdbcLiteralType Odbc...
TotalPrice有值,会导致GrossAmount也为null --即NULL+任何数字都会是NULL --NULL不能和任何字段比较和...