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from the browser All tasks should be stopped and any threads halted The HelloWorld class doesn t need to override all of the methods Typically, the init() method should be used to prepare the applet for the main task ahead by performing work which only needs to be done once in the lifetime of the applet, for example allocating storage for arrays The start() method performs the applet s work or establishes other objects to do the work Most applets that override start() will also need to override stop() The stop() method should be used to prevent the applet consuming system resources when the applet is not active for example, halting a demanding graphics routine when the user moves on to a different browser page One of the most common ways of redefining start() is to create a thread which runs as a background process and then use a call to stop() to halt the thread at the start of the next loop This means that the thread doesn t die immediately after stop() is called; however, for most applets this won t be a big issue If your applet uses a thread with a very time-consuming main loop you should consider breaking up the code so that the thread checks for stop() being called more frequently The effect of letting a thread (or any other similar object) live long after the user has moved on is to slow down the client machine If the user encounters several such ill-behaved applets then the client can be ground to a halt Many applets don t bother to override the destroy() method, because their stop() method puts the applet into a state suitable for being unloaded This is an acceptable approach because the Java system guarantees to call stop() prior to calling destroy() 1022 Adding life-cycle methods to the HelloWorld class So, let's build on the HelloWorld class to include examples of the life-cycle methods To keep things simple, we will just have the class print a line to the standard output when each of the methods is invoked You should spend some time loading, reloading, and unloading the applet until you are happy that all of the methods are called and, more importantly, the methods are called in the correct order The revised class is shown below: import javaawtGraphics; public class HelloWorld extends javaappletApplet { public void init() { Systemoutprintln("Applet: system has called init()"); resize(100,100); } public void paint(Graphics g) { gdrawString("Hello World!",5,20); } public void start() { Systemoutprintln("Applet: system has called start()"); } public void stop() {.

Once the write operations are completed, both the FileStream and the StreamWriter need to be closed so that they are not left open indefinitely while waiting for the garbage collector to run This listing does not include any error handling, so if an exception is thrown, neither Close() method will be called The load process is similar (see Listing 514)

A literal value is a representation of a constant value within source code For example, if you want to have SystemConsoleWriteLine() print out the integer value 42 and the double value 1618034 (Phi), you could use the code shown in Listing 21

class Employee { // }

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// IO namespace using System; using SystemIO; class DataStorage { // public static Employee Load(string firstName, string lastName) { Employee employee = new Employee(); // Instantiate a FileStream using FirstNameLastNamedat // for the filename FileModeOpen will open // an existing file or else report an error FileStream stream = new FileStream( firstName + lastName + "dat", FileModeOpen);2 // Create a SteamReader for reading text from the file StreamReader reader = new StreamReader(stream); // Read each line from the file and place it into // the associated property employeeFirstName = readerReadLine(); employeeLastName = readerReadLine(); employeeSalary = readerReadLine(); // Close the StreamReader and its Stream readerClose(); // Automatically closes the stream

SystemConsoleWriteLine(42); SystemConsoleWriteLine(1618034);

2 This code could be improved with a using statement, a construct avoided because it has not yet been introduced

42 1618034

return employee; } }

class Program { static void Main() { Employee employee1; Employee employee2 = new Employee(); employee2SetName("Inigo", "Montoya"); employee2Save(); // Modify employee2 after saving IncreaseSalary(employee2); // Load employee1 from the saved version of employee2 employee1 = DataStorageLoad("Inigo", "Montoya"); ConsoleWriteLine( "{0}: {1}", employee1GetName(), employee1Salary); // } // }

The practice of placing a value directly into source code is called hardcoding, because changing the values means recompiling the code Developers must carefully consider the choice between hardcoding values within their code and retrieving them from an external source, such as a configuration file, so that the values are modifiable without recompiling

OUTPUT 54:

Systemoutprintln("Applet: system has called stop()"); } public void destroy() { Systemoutprintln("Applet: system has called destroy()"); } } At this point you should compile the applet and view it in a browser Play around with the page and watch the output as you load and unload the applet code Each time one of the methods is invoked, the applet just prints out a line using the System class library detailing the method If all is well, the methods should be called in the following order when the applet is first loaded: init(), start(), stop(), destroy()

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