Encapsulation of Operations in OOP

Encapsulation is the concept of hiding the internal implementation details of an object from external users. In database applications, this requirement is relaxed by dividing object structures into visible and hidden attributes, where visible attributes can be accessed directly through query languages and hidden attributes can only be accessed through predefined operations.

The interface of an operation, also known as the signature, defines the name and arguments of the operation, while the implementation, also known as the method, defines how the operation is carried out.

A class is a type definition that includes the definitions of operations that can be applied to objects of that type. It defines the structure and behavior of an object, including the operations that can be performed on it.

<p>Operations are invoked on objects using the dot notation, where the object reference is followed by the operation name. For example, d.no_of_emps invokes the no_of_emps operation on the object referenced by d.</p> Signup and view all the answers

<p>The constructor operation is used to create a new object, whereas the destructor operation is used to destroy (delete) an object. The constructor returns a reference to the new object, whereas the destructor does not return a value.</p> Signup and view all the answers

<p>DEPARTMENT</p> Signup and view all the answers

<p>extent</p> Signup and view all the answers

<p>persistent</p> Signup and view all the answers

<p>set</p> Signup and view all the answers

<p>collections</p> Signup and view all the answers