7 inheritance and polymorphism
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The document discusses inheritance and polymorphism in C#. Inheritance allows classes to reuse methods and attributes from a base class without recreating them, and allows for generalization and specialization of classes. It implements inheritance by allowing derived classes to access variables and methods of the base class. Methods can be overridden in derived classes using the virtual and override keywords. Polymorphism is achieved through method overriding and overloading, and allows for both compile-time and run-time polymorphism. Sealed classes prevent inheritance from the class.
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This document discusses different types of statements and expressions in C# programming including selection, iteration, jump, exception handling, checked and unchecked statements. It also covers different types of operators such as arithmetic, relational, logical, conditional, increment/decrement, and assignment operators. Finally, it discusses topics like precedence and associativity of operators, data conversions, typecasting, boxing and unboxing.
4 c# programming constructs
The document discusses different programming constructs in C#, including selection constructs like if/else statements and switch/case statements. It also covers loop constructs such as while, do-while, for, nested for, and foreach loops. Finally, it mentions jump statements like break, continue, goto, and return that can change the normal flow of control in a program.
1 get started with c#
C# is a simple, powerful, object-oriented programming language that allows developers to build many different types of applications like desktop and mobile apps. It provides a productive environment through features like garbage collection and type safety. The .NET Framework is a library that supports C# and provides common language runtime and class libraries to enable consistent development across platforms.
2 variables and data types
The document discusses variables and data types in C# programming including defining variables with data types like int and string, different data types like value types and reference types, classification of types, naming conventions, constants and literals, keywords, input and output methods like Console.WriteLine() and Console.ReadLine(), and format specifiers for output. It also provides examples of declaring and initializing variables, defining constants, and using escape sequences and placeholders in output.
Jdbc 7
Digital signatures are used to verify the authenticity and integrity of digital messages or documents. They are generated using public key cryptography with a private key and can be verified by anyone using the corresponding public key. A digital signature encodes the hash of a message with the sender's private key, allowing the recipient to verify that the message was sent by the claimed sender and was not altered.
Jdbc 6
The document discusses cryptography in Java. It describes how cryptography is used to maintain confidentiality and protect information during transmission. It then explains the main cryptography concepts like encryption algorithms, keys, symmetric and asymmetric encryption. It discusses the Java Cryptography Architecture (JCA) framework and how it provides a platform-independent API for cryptography. It also describes the key classes, interfaces and components used in Java cryptography like Cipher, Password Based Encryption and SecretKeyFactory.
Jdbc 3
RowSets provide scrollability and updatability for result sets from databases and drivers that do not support those features natively. There are three main types of RowSets: CachedRowSets cache data in memory for disconnected use, JdbcRowSets are thin wrappers around ResultSets that maintain a connection, and WebRowSets use HTTP to communicate with a servlet for data access. RowSets allow components like GUIs to be notified of data changes through their JavaBeans properties and listeners.
Jdbc 2
JDBC can be used to execute stored procedures on a database server. Stored procedures offer benefits like reduced network traffic, increased security, and lower development costs compared to individual SQL statements. They can accept parameters, return result sets, and be executed using CallableStatement objects. Transactions ensure all statements in a batch execute successfully or none execute to maintain data integrity. JDBC supports implementing transactions through its Connection interface methods like commit(), rollback(), and setAutoCommit().
Php
The document discusses several web technologies:
- HTML is the main markup language for web pages and provides a static structure.
- CSS is used to describe the presentation and formatting of HTML pages through style sheets.
- JavaScript allows for dynamic interactions and one-way communication in web pages.
- PHP brings dynamic interactivity to web pages by running server-side code that can output HTML, manipulate strings, perform operations, and access form data. It allows two-way communication between client and server.
Jdbc 1
JDBC is a Java API that provides interfaces for connecting to and working with databases. It allows Java applications to execute SQL statements and process the results by providing a standard interface for database access that is independent of database vendors. The key classes and interfaces in JDBC include Connection, Statement, PreparedStatement, CallableStatement, and ResultSet. JDBC drivers convert JDBC calls into database-specific protocols to communicate with the database.
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15 anonymous methods, partial types and nullable types
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7 inheritance and polymorphism
- 1. Inheritance and Polymorphism Programming in C# tnngo2@gmail.com
- 2. Inheritance
- 3. Inheritance
- 4. Purpose of Inheritance reuse common methods and attributes among classes without recreating them Generalization Specialization Extension
- 5. Implementing Inheritance https://gist.github.com/2358793
- 6. protected https://gist.github.com/2358827
- 7. based access the variables and methods of the base class from the derived class cannot use for invoking the static method
- 8. new hide the methods or variables of the base class https://gist.github.com/2358859
- 9. Constructor Inheritance https://gist.github.com/2358859
- 11. Method Overriding allows the derived class to override or redefine the methods of the base class.
- 12. virtual & override virtual in base class override in derived class
- 13. Question? https://gist.github.com/2366263
- 14. Question? https://gist.github.com/2366821
- 15. Sealed Classes
- 16. Sealed prevent inheritance https://gist.github.com/2366688
- 17. Purpose of Sealed Classes
- 18. Polymorphism
- 20. Compile-time & Run-time Polymorphism