class file into code, but without reflection it would not be able to write java com.example. This doesn't require reflection, because the java executable can turn a. It can also be used to allow language features to be emulated in the language.Ĭonsider the command line java 圜lass which turns a string into a class name. Interfaces with dynamically typed scripting languages - turn a string value produced by a scripting language into a reference to a field or method on an object.(A future article will look at the latest changes. property is naturally inherent in most Java reflection code and discuss its potential in making reflection analysis more effective. This basic version is used in all but the most recent Java versions. Reflection in Java is a way to call the methods of objects without needing the actual reference to those objects. The code in the following examples resembles the implementation in Java 8, but some complexity has been removed for clarity. More advanced uses lets you list and call methods. if you declared it as an Object) - this might seem trivial, but such reflection is not possible in less dynamic languages such as C++. Object-relational mappings - maintain a relationship between fields in an object and columns in a database. This discussion begins by exploring a simplified form of the reflection mechanism’s code from the JDK. For example, all objects in Java have the method getClass(), which lets you determine the object's class even if you don't know it at compile time (e.g.Serialization and deserialization - convert field names to string so you can write the object's fields to a stream and later convert it back into an object.Remote procedure calling - treat part of a message received over the network as a method name.Any time you're dealing with a string at runtime and want to treat part of that string as an identifier in the language.
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