4. 解决“classes cannot directly extend 'java.lang.Enum'”错误的建议 如果你尝试编写一个类来直接扩展 java.lang.Enum,你将会遇到编译错误。解决这个问题的方法是使用Java内置的枚举类型(即使用 enum 关键字),而不是尝试通过继承 java.lang.Enum 来创建枚举。如上例所示,使用 enum 关键字声明枚举类型是一种...
Cannot convert SQL <sqlColumn> to Protobuf <protobufColumn> because schema is incompatible (protobufType = <protobufType>, sqlType = <sqlType>). CANNOT_CONVERT_SQL_VALUE_TO_PROTOBUF_ENUM_TYPE SQLSTATE: 42846 Cannot convert SQL <sqlColumn> to Protobuf <protobufColumn> because <data> is...
Cannot convert SQL <sqlColumn> to Protobuf <protobufColumn> because schema is incompatible (protobufType = <protobufType>, sqlType = <sqlType>).CANNOT_CONVERT_SQL_VALUE_TO_PROTOBUF_ENUM_TYPESQLSTATE: 42846Cannot convert SQL <sqlColumn> to Protobuf <protobufColumn> because <data> is not ...
9.If the object in the stream is an enum constant, read itsObjectStreamClassand the enum constant name. If theObjectStreamClassrepresents a class that is not an enum type, anInvalidClassExceptionis thrown. Obtain a reference to the enum constant by calling thejava.lang.Enum.valueOfmethod, p...
sealed interface A enum class B : A This will compile with no errors. On the contrary, the snippet below is illegal in Kotlin: sealed class A enum class B : A() This will lead to the following error: Enum class cannot inherit from classes 2. Sealed interfaces allow multiple inheritance...
Next, the value returned by the name method of the enum constant is written as a String object, as described in step 9. Note that if the same name string has appeared previously in the stream, a back reference to it will be written. The writeObject method then returns....
Classes that contain constant values used by controls. These classes all extend com.ms.wfc.core.Enum. Classes that represent events and extend com.ms.wfc.core.Event or are event handler classes (delegates). Classes that represent intrinsic Windows graphical objects such as brushes, bitmaps, colors...
There are two advantages to having theBufferStatusenum within the classRingBufferthat make using the scoping operator worth the effort. First, the enum names are shortened by having thebuffer_prefix removed. The scoping operator tells the developer and the compiler when these status values are vali...
If the object is an enum constant, theObjectStreamClassfor the enum type of the constant is written by recursively callingwriteObject. It will appear in the stream only the first time it is referenced. A handle is assigned for the enum constant. Next, the value returned by thenamemethod of...
The Store is agnostic to the actual state type, it can be a data class, a normal class, enum, etc. It looks like that with the introduction of copyable value classes, the developer will have to choose: either use val reducer: (State, Msg) -> State (which is inconvenient for value ...