Java Programming Language

What is ASP? – Server-side scripting technology – Files containing HTML and scripting code – Access via HTTP requests – Scripting code is interpreted on server side • What can I do with ASP? – Easily and quickly create simple Web applications – Generate dynamic Web content – Client-side scripting for validation – Access COM components to extend functionality

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Outline Objects and Classes OOP Concepts Encapsulation Aggregation/Composition Inheritance & Polymorphism Some useful Java classes Exception Handling, I/O Readings & Exercise Discussion .

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Client's Functions Handle the user interface. Translate the user's request into the desired protocol. Send the request to the server. Wait for the server's response. Translate the response into "human-readable" results. Present the results to the user. Listen for a client's query. Process that query. Return the results back to the client.

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Identifiers: Names for the things you will refer to in your programs Used for programming entities as variables, constants, methods, classes, and packages Rules for naming identifiers: A sequence of characters that consists of letters, digits, underscores (_), and dollar signs ($). Cannot start with a digit. Cannot be a reserved word. Cannot be true, false, or null. An identifier can be of any length. .Variables & Constants Variables: used to store data in a program datatype variableName; datatype variable1, variable2, ..., variablen; Constants Represents permanent data...

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Mechanism to create new classes using existing classes The existing class is called the parent class, or superclass, or base class The derived class is called the child class or subclass As the name implies, the child inherits characteristics of the parent That is, the child class inherits the methods and data defined by the parent class. Once a behavior (method) is defined in a super class, that behavior is automatically inherited by all subclasses

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At the end of the lesson, the student should be able to: Describe the features of Java technology Describe the different phases of a Java program. Java was created in 1991 by James Gosling et al. of Sun Microsystems. Initially called Oak, in honor of the tree outside Gosling's window, its name was changed to Java because there was already a language called Oak.

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Contents Client-side dynamic pages JavaScript .Client-side dynamic pages Web page contains programs (script) that will be executed in the client side by browser. Script improve the interaction of users and web page (than HTML) Program is written by different scripting technologies Javascript: Vbscript Flash Applet Ajax … .Javascript, VBscript Javascript: An interpreted programming, a script language from Netscape. Syntax similar to Java but it is not Java Easier and faster to code in than the more structured and compiled languages such as C and C++.

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Real world concepts can be modeled in a computer program The program is made of objects with certain properties and operations that the objects can perform It is not important how an object is implemented, but what it does Every object is responsible for carrying out a set of related tasks. A class can contain data declarations and method declarations

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Describe the necessity and the advantage of the framework Develop the Web application by using the framework. Struts: The Apache Software Foundation JSF (JavaServer Faces): The Java Community Process(JCP) Webcoordinator: FUJITSU Ltd.Framework to develop the Web app. by using Servlet and JSP. Starts according to the request from a client Offers the mechanism to process request, storage of data, screen transition control, etc. Defines screen transition information in XML file (strutsconfig. xml)...

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Direct start from Web browser: input directly URL of JSP page into Web browser http://servername:8080/JSP/HelloWorld.jsp Start by “Action” attribute of Form tag Start when you push the summitting button on form Start from JSP (or Servlet) : Start by being specified with other JSP files

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The servlet is constructed, then initialized with the init method. Any calls from clients to the service method are handled. The servlet is taken out of service, then destroyed with the destroy method, then garbage collected and finalized.GenericServlet implements the Servlet and ServletConfig interfaces. It provides simple versions of the lifecycle methods init and destroy and of the methods in the ServletConfig interface.

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provide request information for HTTP servlets. The servlet container creates an HttpServletRequest object and passes it as an argument to the servlet's service methods (doGet, doPost, etc).Client request information including : parameter name and values, and an input stream Attributes : custom information about a request. Extends the ServletRequest interface Returns the value of attribute : public Object getAttribute(String name)

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Language Lap trinh JAVA Java is the language programming direction objects (as C + +) do Sun Microsystem output to the first hex niên 90 the ky 20. Program Việt using Java can be running on any hệ system that have installed your virtual Java (JVM - Java Virtual Machine). Máy virtual Java (JVM - Java Virtual Machine): One programs write by Java will be compile ra mã of the virtual Java (mã java bytecode)

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Chương 3 - Giới thiệu Java. Chương này gồm có những nội dung chính sau: Lịch sử phát triển của Java, đặc trưng của Java, tổng quan lập trình Java, kiến trúc chương trình xây dựng trên Java, case study I ( simple programs & language). Mời các bạn tham khảo.

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Lecture Java programming language: Arrays introduces content such as declaring arrays, using arrays, array parameters, array parameters, searching an array, two-demensional arrays, the arraylist class

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Lecture Java programming language: GUIs and Event-Driven programming provide knowledge about what is a gui, the swing package, the swing package, the Jbutton class, handling events, layout manager, controlling layout, getting input from the user,…

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Lecture Java Programming Language: Introduction has main content such as desktop computing, operating systems, enviroment, programming languages, networks, number systems, storing data in memory, why program in java, a java application, formatting output.

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Lecture Java Programming Language: Variables and Constants provide knowledge about declaring variables, using variables, primitive data types, abstract data types, java packages, obtaining a value from the user, type casting, formatting numeric ouput, assignment operators, using named constants.

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Lecture Java programming language: Conditional Control Structures introduces content such as the if Statement , the if-else statement, nested statements, the if-else if statement, the switch statement, generating random number, compound boolean expressions, the math class.

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Loop Structures and Strings has main content such as the while statement, the do-while statemen, infinite loops , the for statement, debugging techniques, the string class, the string class, comparing strings.

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