Final answer:
The statement that a generic class definition includes a generic type placeholder after the class name is true. This enables the class to be used with different data types, offering reusability and type safety.
Step-by-step explanation:
A generic class definition in programming indeed contains a generic type placeholder following the class name. This statement is true. A generic class is defined with a generic type placeholder, which is typically represented within angle brackets after the class name (e.g., Class<T>). These placeholders indicate that the class can operate with any data type that is specified when an instance of the generic class is created. The use of generics provides code reusability and type safety without the need to create multiple versions of the class for different data types.