java reflection:
In Java, the reflection mechanism means that in the running state, any class can know all the properties and methods of this class, and Any method of any object can be called. This function of dynamically obtaining information and dynamically calling object methods is called the reflection mechanism of the Java language.
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The role of java reflection:
Dynamically load classes, dynamically obtain classes Information (properties, methods, constructors)
Dynamicly construct objects
Dynamicly call any methods and constructors of classes and objects
Get generic information
Process annotations
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