1. Talk about Java reflection and its applications
Reflection is a powerful feature in the Java programming language. It allows the program to dynamically obtain class information at runtime, create objects, call methods, access properties, etc. Reflection can provide great flexibility for programs, but it also brings a certain performance overhead.
reflection applications
Reflection has a wide range of applications in Java development, including:
- Dynamically load classes and create objects : Through reflection, you can dynamically load classes and create objects of that class. This is very useful in some application scenarios, such as:
- Dynamically load classes in configuration files at runtime
- Dynamically load third-party library classes at runtime
- Dynamically calling methods : Through reflection, methods in a class can be dynamically called, including private methods. This is very useful in some application scenarios, such as:
- Dynamically call logging methods in a class at runtime
- Dynamically call exception handling methods in classes at runtime
- Dynamic access to properties : Through reflection, you can dynamically access properties in a class, including private properties. This is very useful in some application scenarios, such as:
- Dynamically modify attribute values in a class at runtime
- Dynamically obtain attribute values in a class at runtime
Advantages and Disadvantages of Reflection
Advantages of reflection:
- Flexibility: Reflection can provide great flexibility to the program and can achieve some functions that cannot be achieved by static programming.
- Versatility: Reflection can be applied to a variety of different application scenarios.
Disadvantages of reflection:
- Performance overhead: Reflection will bring certain performance overhead because it requires dynamically loading classes and methods at runtime.
- Safety