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ance in the absence of a full compiler, especially for computationally intensive code which spends large periods of time in complex loops The performance benefit comes from the fact that the native methods have been fully compiled into machine code and will consequently run at full speed As with everything, though, the use of native methods entails a cost In the case of Java, native methods are not cross-platform because they are fully compiled binaries or machine code which have been built for a specific type of hardware running a specific version of the operating system If a development effort relies heavily on native methods for support, it is worth considering selecting another language for the project Java has many strengths, but it is our opinion that native methods should be considered a very short-term fix to address extendibility issues, and should not generally be used if a more flexible alternative is available Native methods erode so much of what is good about Java and require the developer to have prior knowledge of the hardware which is available at the client end The use of native code also reincarnates the problems associated with machine code which we touched on at the start of the chapter While native methods are in principle a good thing they should be used sparingly and avoided in order to preserve the aspects of Java which make for flexible platform-independent computing 1233 Using other programming languages to create byte-codes There is an active discussion at the moment about the possibility of using programming languages other than Java to generate compiled byte-codes which will run in the Java run-time interpreter Developers who have extensive experience in languages such as Smalltalk and C++ want to take advantage of the large potential user base for Java without having to learn a new language The logic of the argument is that since the Java compiler takes Java source code and translates it into platform-neutral byte-codes, it should be possible to write other compilers which take source code written in other languages and generate the same byte-codes These could then be passed to the Java run-time system embedded in Web browsers In principle, this is technically possible although challenging for the compiler designer The Java run-time system expects byte-codes that are related to the Java language This would mean mapping, say, all of the C++ libraries to equivalent Java packages and ensuring that all of the C++ types are mapped to Java types While it is possible to do this, it would result in a less functional version of C++ for use with the Java run-time system since, effectively, Java provides a subset of C++ in many respects Facilities such as multiple inheritance which are supported in C++, but not in Java, would have to resolved, as would access from C++ code to Java libraries installed in the Java distribution on the client machine However, if there is sufficient demand for this type of compiler, and therefore a sufficiently profitable market niche, then it is certain that some development houses will embark on creating such tools At the moment, we do not know of such efforts but, given that it is technically achievable, we fully expect such products to emerge as the user base for the Java run-time system increases.

Programs frequently use stack type collections to facilitate multiple undo operations For example, Listing 112 uses the stack class for undo operations within a program which simulates the Etch A Sketch game

class Program { public static void Main() { Thermostat thermostat = new Thermostat(); Heater heater = new Heater(60); Cooler cooler = new Cooler(80); string temperature; // Note: Use new ThermostatTemperatureChangeHandler( // coolerOnTemperatureChanged) if not C# 20 thermostatOnTemperatureChange += heaterOnTemperatureChanged; thermostatOnTemperatureChange += coolerOnTemperatureChanged; thermostatOnTemperatureChange(42); } }

using System; using SystemCollections; class Program { // public void Sketch() { Stack path = new Stack(); Cell currentPosition; ConsoleKeyInfo key; // New with C# 20 do { // Etch in the direction indicated by the // arrow keys that the user enters key = Move(); switch (keyKey) {

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case ConsoleKeyZ: // Undo the previous Move if (pathCount >= 1) { currentPosition = (Cell)pathPop(); ConsoleSetCursorPosition( currentPositionX, currentPositionY); Undo(); } break; case ConsoleKeyDownArrow: case ConsoleKeyUpArrow: case ConsoleKeyLeftArrow: case ConsoleKeyRightArrow: // SaveState() currentPosition = new Cell( ConsoleCursorLeft, ConsoleCursorTop); pathPush(currentPosition); break; default: ConsoleBeep(); break; } } while (keyKey != ConsoleKeyX); } } public struct Cell { readonly public int X; readonly public int Y; public Cell(int x, int y) { X = x; Y = y; } }

In Listing 1328, Program is able to invoke the OnTemperatureChange delegate even though the CurrentTemperature on thermostat did not change Program, therefore, triggers a notification to all thermostat subscribers that the temperature changed, but in reality, there was no change in the thermostat temperature As before, the problem with the delegate is that there is insufficient encapsulation Thermostat should prevent any other class from being able to invoke the OnTemperatureChange delegate

// New with C#20

C# provides the event keyword to deal with both of these problems event modifies a field declaration, as shown in Listing 1329

The results of Listing 112 appear in Output 111 Using the variable path, which is declared as a SystemCollectionsStack, you save the previous move by passing a custom type, Cell, into the StackPush() method using pathPush(currentPosition) If the user enters a Z (or Ctrl+Z), then you undo the previous move by retrieving

OUTPUT 111:

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