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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.
Sequential File Organisation The most necessary way to organise the collection of records in a file is to use sequential Organisation. Records of the file are stored in series
Synonyms and Indexes Some of the essential properties of indexes are: An Index is a schema Object Indexes can be formed explicitly or automatically Indexes are m
1 - Serial RS232 comm port comunication 2 - NanoHTTPD serving a few processed pages 3 - System tray application to indicate status and access configuration forms 4 - SQLit
What are the causes of bucket overflow in a hash file organization? What can be done to reduce the occurrence of bucket overflow? When a record is inserted, the bucket to that
(a) Explain the three types of potential mistake which could occur if concurrency control is not properly enforced in the database system. Support your answer with appropriate ex
Define Catalog and meta data ? A catalog is a compilation of records elaborating the contents of a particular collection or group of collections. Metadata (Meta data, or someti
A database named yourusernameFMA has been set up for you to use for this assignment. For the FMA you must create the required tables and run the queries using this database. If y
Benefits and limitations
What is Message switching Message switching transmits data units which can be arbitrarily long. Packet switching has a utmost packet size, if any message longer than that, it s
What is Data Storage? The storage structures and access methods used by database system are specified by a set of explanation in a special type of DDL called data storage-defin
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