What are the restrictions on generics?

Restrictions on Generics

Cannot Instantiate Generic Types with Primitive Types.
Cannot Create Instances of Type Parameters.
Cannot Declare Static Fields Whose Types are Type Parameters.
Cannot Use Casts or instanceof With Parameterized Types.
Cannot Create Arrays of Parameterized Types.

Why do some claim that Java’s implementation of generics is bad?

The main problem is that Java doesn’t actually have generics at runtime. It’s a compile time feature. When you create a generic class in Java they use a method called “Type Erasure” to actually remove all of the generic types from the class and essentially replace them with Object.

Which are the advantages and disadvantages of generics?

Generic types and methods – Pros and Cons

Readability and Documentation. More precise indication of types. Less downcasting from class Object.
Type Checking. Better and more precise typechecking.
Efficiency. There is a potential for more efficient programs. Less casting – fewer boxings.

What benefits do generics have over exceptions?

Generics enable the use of stronger type-checking, the elimination of casts, and the ability to develop generic algorithms. Without generics, many of the features that we use in Java today would not be possible.

Why do generics not support primitives?

Answer is Object is superclass of all objects and can represent any user defined object. Since all primitives doesn’t inherit from “Object” so we can’t use it as a generic type.

What is generic method in Java?

Generic methods are methods that introduce their own type parameters. Static and non-static generic methods are allowed, as well as generic class constructors. The syntax for a generic method includes a list of type parameters, inside angle brackets, which appears before the method’s return type.

Why is type erasure bad?

It also misses opportunities for static optimisation. The fact that type parameters are erased prevents some instances of these incorrect programs to be constructed, however, more incorrect programs would be disallowed if more type information was erased and the reflection and instanceof facilities were removed.

Is generics good or bad?

Are generic drugs less effective? No. Generic medications are just as effective as brand-name drugs. According to the FDA, drug makers must prove that generic medications can be substituted for brand-name drugs and offer the same benefits as their brand-name counterparts.

What are the disadvantages of generic medicines?

Cons of generic drugs:

Patients perceive them as inferior to branded drugs.
If they’re not co-formulated, higher pill burdens may deter adherence.
Overall co-payments for a regimen could result in higher costs to patients.
They may have a different pill size/color when generic suppliers change.

Why are generics used?

In a nutshell, generics enable types (classes and interfaces) to be parameters when defining classes, interfaces and methods. By using generics, programmers can implement generic algorithms that work on collections of different types, can be customized, and are type safe and easier to read.

Can we use generics in exception?

As to the second half of your question, the language doesn’t permit the use of generics for exception types. Since type parameters of generics are erased at runtime, there is no way to distinguish between generic exceptions with different type parameters in the catch clause, thus generic exceptions are not supported.

When should generics be used?

Generics should be used instead of raw types ( Collection< T > instead of Collection , Callable< T > instead of Callable , …) or Object to guarantee type safety, define clear type constraints on the contracts and algorithms, and significantly ease the code maintenance and refactoring.

Is there a safe way to prevent decompilation?

Indeed David Anton, but you can never make it 100% safe. You can encrypt your DLL’s and before they getting loaded into the AppDomain you can decrypt them. This will be an other good way to prevent decompilation when you combine this with obfuscation.

Is it safe to use obfuscators to prevent decompilation?

Just be aware that obfuscators will not prevent decompilation – they just make it harder to understand your code once it is decompiled. Indeed David Anton, but you can never make it 100% safe. You can encrypt your DLL’s and before they getting loaded into the AppDomain you can decrypt them.

Is there a way to skip the decompilable MSIL?

The problem w/ NGen [to my knowledge] is that the CLR needs the original assembly for metadata and other stuff. But there should be a way to compile directly to the target machine code, in which case, skips the decompilable msil. A colleage of mine mentioned that you could also write the intellectual property / complex algorithms in unmanaged c++.

What are the restrictions on generics?