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With the language constructs you ve learned so far, you can build powerful objects of many different types. You do this mostly by declaring classes that encapsulate the behavior you want, and then creating instances of those classes. All the types used in the class declarations so far have been specific types either programmer-defined, or supplied by the language or the BCL. There are times, however, when a class would be more useful if you could distill or refactor out its actions and apply them not just to the data types for which they are coded, but for other types as well. Generics allow you to do just that. You can refactor your code and add an additional layer of abstraction so that, for certain kinds of code, the data types are not hard-coded. This is particularly designed for cases in which there are multiple sections of code performing the same instructions, but on different data types. That might sound pretty abstract, so we ll start with an example that should make things clearer.

Note On a Microsoft Windows machine, pressing Alt+F4 will close the splash screen immediately. The

data-type Suffix: Initialization (Left of =) / Binding (Parameter)

Suppose first that you have created the following code, which declares a class called MyIntStack, which implements a stack of ints. It allows you to push ints onto the stack and pop them off. class MyIntStack { int StackPointer = 0; int[] StackArray; Int Int public void Push( int x ) { ... } Int public int Pop() { ... } ... }

The final method of SplashScreen worth mentioning is the close() method. To close the screen and release its resources before an AWT (or Swing) window is shown, you can call this method. Calling isn t necessary, though, as the method will be called automatically when the top-level window becomes visible.

Suppose now that you would like the same functionality for values of type float. There are several ways you could achieve this. One way is to perform the following steps to produce the subsequent code: Cut and paste the code for class MyIntStack. Change the class name to MyFloatStack. Change the appropriate int declarations to float declarations throughout the class declaration. class MyFloatStack { int StackPointer = 0; float [] StackArray; float float public void Push( float x ) { ... } float public float Pop() { ... } ... } This method certainly works, but it s error-prone, and has the following drawbacks: You need to inspect every part of the class carefully to determine which type declarations need to be changed, and which should be left alone. You need to repeat the process for each new type of stack class you need (long, double, string, etc.). After the process, you end up with multiple copies of nearly identical code, taking up additional space. Debugging and maintaining the parallel implementations is inelegant and error-prone.

The logical operators are used for comparing or negating the logical values of their operands and returning the resulting logical value. The operators are listed in Table 8-11. The logical AND and logical OR operators are binary and left-associative. The logical NOT is unary. Table 8-11. The Conditional Logical Operators

Further, C++ allows pointer manipulation, which can easily lead to reading something that is supposed to be unattainable and writing something in the wrong place, corrupting data even of unrelated applications Java doesn t allow pointer manipulation Similarly, C++ allows an array index to be set to any integer, regardless of array size; this then translates to a memory address, and the same corruption can occur So, the programmer must always manually program a check for array overflow and underflow (where the index is less than zero) Java, very simply, does this automatically Another example of C++ complexity also regarding memory is memory reclamation when an object is no longer referenced by other objects Without proper memory reclamation, a program is more likely to run out of memory.

Yet another new class in AWT that provides direct access to the user s desktop is the SystemTray class. In the notification area of your desktop (where you see little icons about what system apps are running, like your antivirus software, the coffee cup logo for the browser s Java runtime, and network connectivity indicators), more and more applications are vying for a little part of this space. (See Figure 4-4 for a view of this area in

&& || !

true if both operands are true; false otherwise true if at least one operand is true; false otherwise true if the operand is false; false otherwise