In addition, you can use Class instance to get implemented interfaces, super class, declared field, etc. } Example 4: Get constructor and create instance package myreflection Ĭonstructor cons = c.getConstructors() Reflection is useful in those situations where we dont know which method we want to call at the time we are writing our program. } abc Example 3: Create object from Class instance package myreflection Method = f.getClass().getMethod("print", new Class)
JAVA REFLECTION EXAMPLE PROGRAM CODE
By using reflection, the code can use the object and find out if the object has a method called “print” and then call it. Output: myreflection.Foo Example 2: Invoke method on unknown objectįor the code example below, image the types of an object is unknown. String getName () Returns the name of the method represented by this Method object, as a String. This is achieved by using the Java class.
JAVA REFLECTION EXAMPLE PROGRAM HOW TO
(Here is a set of examples of how to use JUnit.)Įxample 1: Get class name from object package myreflection Using Java Reflection API we can inspect the methods of classes and invoke them at runtime.
Examine a class’s field and method at runtime.Construct an object for a class at runtime.After a serialized object has been written into a file, it can be read from the file and. Reflection enables us to do the following: Java provides a mechanism, called object serialization where an object can be represented as a sequence of bytes that includes the objects data as well as information about the objects type and the types of data stored in the object. Some languages support introspection, but do not support reflection, e.g., C++. Introspection (Type introspection) is the ability of a program to examine the type or properties of an object at runtime. This concept is sometimes mixed with introspection. Java Reflection is an API provided in Java programming language that makes it possible to inspect classes, methods, fields etc. In brief, reflection is the ability of a program to examine and modify the structure and behavior of an object at runtime.
Please leave your comment for suggestions. Hopefully, it can give you an overview of this concept. In this tutorial, I mainly write some examples to introduce what Java reflection can do.
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