Web Reference: Mar 14, 2026 · Reflection in Java allows a program to inspect and manipulate classes, methods, fields, and constructors at runtime, even when their details are unknown at compile time. It is provided through the java.lang.reflect package and is widely used in frameworks and libraries. To examine class metadata (methods, fields, constructors) during runtime In this tutorial, we will explore Java reflection, which allows us to inspect and/or modify runtime attributes of classes, interfaces, fields and methods. This particularly comes in handy when we don’t know their names at compile time. Additionally, we can instantiate new objects, invoke methods and get or set field values using reflection. 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.
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