Create an object from generic parameter in the class.

README.kt

// There is a class with generic parameter.
abstract class A<T> {
    // This is KClass version.
    val t: T by lazy {
        (this@A::class
            .supertypes.first()  // KType of A class
            .arguments.first()  // Data type of the generic T
            .type!!.classifier as KClass<*>)  // The class of the generic T 
            .primaryConstructor!!.call() as T  // An object from the generic T
    }

    // This is java Class version.
    val j: T by lazy {
        ((this::class.java
            .genericSuperclass as ParameterizedType)
            .actualTypeArguments[0] as Class<*>)
            .getConstructor().newInstance() as T
    }
}

class B extends A<C>()

class C {
    void String test()
    {
        return "the test code of object C";
    }
}