A naukri.com initiative
Dev
1M
107
Image Credit: Dev
Working with Private Members and Method Invocation in Java Reflection
- Reflection in Java allows accessing private members, methods, and arrays at runtime, providing the ability to manipulate hidden or restricted elements.
- Private fields are mainly for encapsulation and safety, as final fields ensure values remain constant and prevent accidental changes.
- Deep reflection involves breaking into non-public elements using setAccessible(), allowing access to any element regardless of its visibility.
- Deep reflection is commonly used for accessing private fields like changing values in a Person class, albeit caution is advised for final fields.
- Reflection checks permissions every time a method is invoked, leading to performance overhead, and exception handling adds runtime cost.
- MethodHandles.lookup() provides a more performant and flexible way to invoke methods and constructors compared to traditional reflection.
- MethodHandle offers advantages like no parameter boxing, direct exception throwing, reduced access checks, and return type matching.
- By using MethodHandles, developers can achieve more efficient method calls, especially for primitives, and have finer-grained access control.
- Overall, deep reflection and MethodHandles provide powerful tools for dynamic manipulation and invocation in Java, enhancing flexibility and performance.
Read Full Article
6 Likes
For uninterrupted reading, download the app