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Generics is one of the best things that happened to Java. Anyone who has worked with Java during its pre-JDK5 era can attest to that. For new developments, it has drastically reduced the amount of written codes and provided compile-time type checking using Generic Types. However, there are some things you cannot do with Generics Types.
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Call their Constructors
Generic Types cannot be instantiated using its constructor. For example:
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The compile-time error is as follows:
Create Arrays
We cannot create an array of a Generic Type.
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The compile-time error is as follows:
Call instanceof
Calling instanceof on Generic Types results in compile-time errors.
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The compile-time error is as follows: 
Use primitives as Generic Type Parameters
Generics only deal with classes and objects.
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The compile-time error is as follows: 
Create static variable
Generic Types cannot be used to create static variables.
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The compile-time error is as follows: 
