Question: Is Reflection Good Or Bad?

Should you use reflection?

Reflection is a very powerful API but it may slow down the application if used in excess, as it resolves all the types at runtime.

Java Reflection makes it possible to inspect classes, interfaces, fields and methods at runtime, without knowing the names of the classes, methods etc.

at compile time..

Is Reflection an Antipattern?

Reflection, by definition, allows you to inspect and modify code through code; if that is what you need to do, then reflection is the tool for the job. Reflection is all about meta-code: Code that targets code (as opposed to regular code, which targets data).

Should reflection be avoided?

Basically, avoid reflection in general code if at all possible; look for an improved design. So, it depends. If you only need equals and hashcode rarely, it’s pragmatic, and probably o.k., to use a general purpose reflection calculation.

What are the drawbacks of reflection?

Since reflection allows code to perform operations that would be illegal in non-reflective code, such as accessing private fields and methods, the use of reflection can result in unexpected side-effects, which may render code dysfunctional and may destroy portability.

Why is reflection important in learning?

Reflecting on experiences encourages insight and complex learning. … We foster our own growth when we control our learning, so some reflection is best done alone. Reflection is also enhanced, however, when we ponder our learning with others.

Is Typeof slow?

typeof(Foo) is a static type lookup; essentially it occurs at compile time, so you only get the explicitly named type. … So it’s “slower”, theoretically, but it’s giving you something you can’t get from typeof(T) . If you need one or the other for your design, the speed isn’t going to be a factor.

Is reflection slow?

Reflection is slower Because it involves types that are dynamically resolved, certain Java virtual machine optimizations can not be performed.

What is Reflection in Java and why is it useful?

Reflection is a feature in the Java programming language. It allows an executing Java program to examine or “introspect” upon itself, and manipulate internal properties of the program. For example, it’s possible for a Java class to obtain the names of all its members and display them.

What is reflection used for?

In object-oriented programming languages such as Java, reflection allows inspection of classes, interfaces, fields and methods at runtime without knowing the names of the interfaces, fields, methods at compile time. It also allows instantiation of new objects and invocation of methods.

Is Java Reflection slow?

Reflection is 104 percent slower than direct access, meaning it is about twice as slow. It also takes longer to warm up.

Why is Java reflection slow?

Reflection is slow for a few obvious reasons: The compiler can do no optimization whatsoever as it can have no real idea about what you are doing. This probably goes for the JIT as well. Everything being invoked/created has to be discovered (i.e. classes looked up by name, methods looked at for matches etc)

Is Gettype reflection?

typeof(MyType); To get the Type , then when one queries the info about the type e.g. getting properties, fields, attributes etc. they are certainly performing reflection.