Use inheritance as an implementation technique, Database Management System

Assignment Help:

Use inheritance as an implementation technique

when you are going to use inheritance as an implementation technique, you can achieve same goal in a safer way by making one class an attribute or associate of other class. In this way, one object could selectively invoke desired functions of another class, by using delegation rather which applying inheritance. 

A safer implementation of Stack will delegate to List class as shown in Figure. Every instance of Stack includes a private instance of List. Stack: push operation delegates to list by calling its last and add operations to add the element at the end of list, and the pop operation has a same implementation using last and remove operations. The ability to corrupt stack by adding or removing arbitrary elements is hidden from client of the Stack class.

 

1992_Alternative implementations of a Stack using inheritance.png


Related Discussions:- Use inheritance as an implementation technique

What are the advantages of logical databases, What are the advantages of Lo...

What are the advantages of Logical Databases? It offers a simple-to-use selection screens.  You can change the pre-generated selection screen to your needs.  It offers check f

Design of a database, Ask questioYou are the database administrator in a un...

Ask questioYou are the database administrator in a university. You have been tasked to come up with a new database for the University. Using the stages in Database Life Cycle come

Cases of constraint violations, (1)     Insert into PERSON Violated con...

(1)     Insert into PERSON Violated constraint: - Key constraint Reason: - Primary key 1 already exists in PERSON. Dealing: - DBMS could ask the user to provide valid PER

Transaction, what are the states of transaction?

what are the states of transaction?

Field, examples of fields in a database

examples of fields in a database

What is a disjoint less constraint, What is a disjoint less constraint? ...

What is a disjoint less constraint? Ans: It needs that an entity belongs to no much more than one level entity set.  Disjoint less constraint needs that an entity belongs to

Define single valued and multivalued attributes, Define single valued and m...

Define single valued and multivalued attributes. Single valued attributes: attributes with a single value for a particular entity are known as single valued attributes. Mult

Insert statement reverses storage space and transfers value, A field-groups...

A field-groups statement or an insert statement reverses storage space and transfers values. False.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd