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Object reference not set to an instance of an object The term instance of an object refers to an object that has been created using the syntax new When you call new to initialize an object, an unused memory location is allocated to store a copy of the object until the program ends, or the object goes out of scope and is freed by the garbage collector
The difference between Classes, Objects, and Instances The difference between an object and an instance is, an object is a thing and an instance is a relation In other words, instance describes the relation of an object to the class that the object was made from
How to cast List lt;Object gt; to List lt;MyClass gt; - Stack Overflow (List<Customer>)(Object)list; you must be sure that at runtime the list contains nothing but Customer objects Critics say that such casting indicates something wrong with your code; you should be able to tweak your type declarations to avoid it But Java generics is too complicated, and it is not perfect Sometimes you just don't know if there is a pretty solution to satisfy the compiler
Difference between iframe, embed and object elements HTML5 defines several embedded content elements, which, from a bird's-eye view, seem to be very similar to the point of being largely identical What is the actual difference between iframe, embed