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} 433 Strings as objects The previous two sections of this chapter have concentrated on the basic data types and control structures of Java To conclude the chapter we are returning to strings There are a number of reasons behind this First, strings in Java are regarded as objects and we feel that before reading the next chapter it would be useful for you to see more messages being sent to objects and, also, since many of you will be familiar with strings within other programming languages it would be easy for you to understand the main object concepts that you need to program in Java Second, strings, while being regarded as objects in Java, have some properties of basic data types; these properties have been designed to appeal to C programmers who may have used strings in their programs in a non-object-oriented way Before proceeding it is worth reminding you of an item of vocabulary which will be used within this section A message is something that is sent to an object A message consists of a name and some arguments with the possibility of there being zero arguments When a message is sent to an object a variety of things could occur: first, the state of the object could be changed; second, the state of the object could be changed and a value returned from the message; third, the state of the object could remain unchanged and a value be returned Messages will correspond to the methods which are associated with the class which describes the receiver object When a message is sent to a destination object its class is discovered and the code corresponding to the message executed In Java there are two types of sequences of characters These are String and StringBuffer Objects described by the former are constants which cannot be changed, while objects described by the latter can be modified Normally Java code involves strings being converted into StringBuffers, modified and then reconverted into strings There are a number of ways of creating Strings and StringBuffers The first is to declare them using the normal declaration facility that you have seen previously For example, the declaration: String filename, rootDirectory; StringBuffer userName; declares two strings called filename and rootDirectory and a StringBuffer called userName These can be initialized by means of an assignment For example: userName = "James Davis"; sets the contents of userName to be the string "James Davis" This is very straightforward but hides a subtle point that we made in the first paragraph: in Java strings are regarded as objects, but there are facilities within Java for strings which are not object-oriented, but which have been included to smooth the path of programmers who are used to other languages (most notably C) when they program in Java If strings were pure objects in Java, then assignments such as the above would be disallowed The only way to communicate properly with a real object is via a message, so if strings were pure objects the way of setting the value of a string would be to write an expression such as: newUsersetStringValue("James Davis"); which sets a string value within the object newUser There are other examples of this compromise within Java For example, when you want to join together (concatenate) two strings and set a StringBuffer variable equal to the result of this operation, you would use the + operator For example, the code: StringBuffer pcFile = userId + "" + extension; concatenates the string in userId with the single character string "" and the string in extension The + operator carries out this concatenation and returns with the string which has been so. itextsharp edit existing pdf c# How to replace specific word in pdf using itextsharp C#.net ...
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in order to save any information entered into a PDF form. Alternatively ... As per iText , one can generate such pdf only by using adobe software. formed If strings were pure objects in Java the concatenation process would have to be achieved by sending a series of concatenation messages to pcFile Since strings are objects albeit slightly impure objects there are still a large number of messages that can be sent to them A list of the five most frequently used methods is shown in Table 46 These methods give rise to the messages which we shall describe later in this section The length method is an example of one of those messages that do not affect the receiver object but which return a value For example, the code below declares two string objects str1 and str2 and then sends a length message to them; each of these messages will return a value and the sum of these values is placed in the integer variable sumUp int sumUp; String str1, str2; // Code in which the strings are given values sumUp = str1length() + str2length(); In object terms the receiver objects (str1, str2) have been sent length messages These messages have no arguments, but result in a value being returned which is the length of the strings in terms of the number of characters found This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how } it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, } including the server-side compilation model, code-behind classes, server-side controls, form validation, the data binding model, and custom control development Throughout the book, working examples illustrate best practices Sample Page Using the Utility ClassC# Listing 1-13 for building Web-based applications in Among the topics explored in depth are: <Canvas xmlns="http://schemasmicrosoftcom/client/2007"> <CanvasRenderTransform> <TransformGroup> <ScaleTransform ScaleX="15"/> <RotateTransform A ngle="30"/> <TranslateTransform X="100" Y="-10"/> </TransformGroup> </CanvasRenderTransform> <Ellipse Fill="LightGray" Stroke="Black" StrokeThickness="20" Width="200" Height="200" /> <Rectangle Fill="Gray" Stroke="Black" StrokeThickness="20" CanvasLeft="100" CanvasTop="100" Width="200" Height="200" /> </Canvas> <! File: TempConverteraspx > <%@ Page Language='C#' %> ASPNET architecture <html><body> <h2>32 degrees Fahrenheit is Web forms <%= TempConverterFahrenheitToCentigrade(32)%> degrees centigrade</h2> Configuration </body></html> HTTP pipeline Diagnostics applications, components used by pages and deployed in this fashion were notoriously In traditional ASP and error handling difficult to update or replace Whenever the application was up and running, it held a reference to the Validation component file; so to replace that file, you had to shut down IIS (temporarily taking your Web server offline), replace the file, and restart IIS One of the goals of ASPNET was to eliminate the need to stop the Data binding running Web application whenever components of that application need to be updated or replaced that is, updating an application should be as simple as using xcopy to replace the components on the Web server Custom controls with the new updated versions To achieve this xcopy deployment capability, the designers of ASPNET had to ensure two things: first, that the running application not hold a reference to the component file; and Caching second, that whenever the component file was replaced with a new version, that new version was picked up with any subsequent requests made to the application Both of these goals are achieved by using the State management shadow copy mechanism provided by the Common Language Runtime (CLR) how to edit pdf file in asp.net c# PDF Editor to Edit PDF files in ASP.NET Application - YouTube
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