getDeclaredConstructorClass

DeclaredConstructorClass is a Java concept related to reflection and class loading. It refers to a specific constructor within a class that has been explicitly declared. When using Java's reflection API, you can obtain a reference to a class and then access its constructors. The getDeclaredConstructor() method of the java.lang.Class class allows you to retrieve a Constructor object representing a particular constructor of the class.

This method takes an array of Class objects as arguments, specifying the parameter types of the constructor you wish to obtain. If a constructor with the specified parameter types exists, it is returned. If no such constructor is found, a NoSuchMethodException is thrown. The getDeclaredConstructor() method is distinct from getConstructor(), which only returns public constructors. getDeclaredConstructor() can return constructors of any access modifier (public, protected, default, private).

Once you have a Constructor object obtained through getDeclaredConstructor(), you can then use its newInstance() method to create an instance of the class, provided you supply the correct arguments that match the constructor's parameter types. This mechanism is fundamental for dynamic instantiation and manipulation of objects in Java applications where the exact class or constructor might not be known at compile time. It plays a crucial role in frameworks like dependency injection and serialization.