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Implementing Equals for a Reference Type When One or More of Its Base Classes Overrides Object s Equals

document.add(new Chunk("\n", NORMAL));

PdfReader[] readers = { new PdfReader(LinkActions.RESULT2), new PdfReader(LinkActions.RESULT1) }; Document document = new Document(); PdfCopy copy = new PdfCopy(document, new FileOutputStream(RESULT1)); document.open(); int n; Makes links to local named for (int i = 0; i < readers.length; i++) { destinations explicit readers[i].consolidateNamedDestinations(); n = readers[i].getNumberOfPages(); for (int page = 0; page < n; ) { copy.addPage(copy.getImportedPage(readers[i], ++page)); } } copy.addNamedDestinations(SimpleNamedDestination Adds map of named .getNamedDestination(readers[1], false), destinations readers[0].getNumberOfPages()); document.close();

When you re done experimenting with the UNPIVOT operator, drop the EmpYearValues table:

page_94

ripples[i].rippleTimeline .playFromStart(); } }; }; } package function start(x:Integer,y:Integer) : Void { this.layoutX = x; this.layoutY = y; masterTimeline.playFromStart(); } } class Ripple extends Circle { var animRadius:Number; override var fill = null;

Member: (0a000001) WriteLine: CallCnvntn: [DEFAULT] ReturnType: Void 1 Arguments Argument #1: String

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able to work out that modifiedString is also a string Any variable declared with var will have a static type The compiler determines other aspects of code statically besides the types of variables For example, there are method calls The ConsoleReadLine() call is straightforward Console is a class name, so our code has been explicit about where to find the method Since there s no scope for ambiguity over which method we mean, this is a static method invocation we know at compile time exactly which method will be called at runtime The myStringReplace method is slightly more interesting: myString refers to a variable, not a class, so to understand which method will be invoked, we need to know what type myString is But as we already saw, in this example, its type is known statically to be string.

As it happens, there are two overloads of Replace, one that takes two string arguments and one that takes two char arguments In this code, we are passing to string literals, so the argument types are also known statically This means that the compiler can work out which overload we require, and bakes that choice into the compiler output once compilation completes, the exact method that Example 18-1 invokes is fixed All the decisions are made at compile time here, and nothing can change the decision at runtime, and this is the nature of the static style Dynamic features defer decisions until runtime For example, in a language that supports dynamic method invocation, the business of working out exactly which method to run doesn t happen until the program gets to the point where it tries to invoke the method.

field[ Field_FloatingPoint ] = new FloatingPointField(); field[ Field_Integer ] = new IntegerField(); field[ Field_String ] = new StringField(); field[ Field_TimeOfDay ] = new TimeOfDayField(); field[ Field_Boolean ] = new BooleanField(); field[ Field_BitField ] = new BitFieldField();

This means that dynamic code doesn t necessarily do the same thing every time it runs a particular piece of code might end up invoking different methods from time to time You might be thinking that we ve seen C# features in earlier chapters that enable this And you d be right: virtual methods, interfaces, and delegates all provide us with ways of writing code which picks the exact method to run at runtime Static/dynamic is more of a continuum than a binary distinction Virtual methods are more dynamic than nonvirtual methods, because they allow runtime selection of the method Interfaces are more dynamic than virtual methods, because an object does not have to derive from any particular base class to implement a particular interface.

Delegates are more dynamic than interfaces because they remove the requirement for the target to be compatible with any particular type, or even to be an object whereas virtual methods and interfaces require instance methods, delegates also support those marked with the static keyword (Again, try not to get distracted by the overlap in terminology here) As you move through each of these mechanisms, the calling code knows slightly less about called code there s more and more freedom for things to change at runtime..

Part III:

This evaluates the expression on the righthand side, and assigns the result to the variable specified on the lefthand side. However, this process of adding a value to a variable is so common that there s a special syntax for it:

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