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Apple Computer and its Macintosh computer are often at the leading edge of user interfaces and hardware, in both designs and features. For the Macintosh, Apple created the first operating system based on a graphical user interface (GUI), using a pointing device (mouse), pictures (icons), and windows. The Mac OS now also includes the Sherlock computer search and Safari network-integrated search-and-presentation programs. Just a few of Apple s hardware innovations, since its founding in the 1970s, are the assembled microcomputer (personal computer), dynamically identified plug-in devices (hot swapping), the personal data assistant (PDA), the docked portable PC (the PowerBook), the flat-screen monitor and the mouse pad (both for the PowerBook), the optical mouse, the one-unit PC (the iMac), the portable MP3 player (the iPod), and the dial pad (for the iPod). Apple is the largest manufacturer of both hardware and software for personal computers, and it now creates the most computer units built on a version of the UNIX operating system (platform). NeXT Inc., started by Apple cofounder Steve Jobs, was in many ways at the leading edge in software development environments. It is now owned by Apple, and its development environment is now the basis for Apple s.

Figure 8-5. Examples of bitwise logical operators The following code implements the preceding examples: const byte x = 12, y = 10; sbyte a; a a a a = = = = x & y; x | y; x ^ y; ~x; // // // // a a a a = = = = 8 14 6 -13

Compiling and running the program will add another icon to the system tray. Rest your mouse over it to see the tool tip text, as shown in Figure 4-5. Right-click the tray icon to see the pop-up menu, as shown in Figure 4-6.

The bitwise shift operators shift the bit pattern either right or left a specified number of positions, with the vacated bits filled with 0s. The shift operators are listed in Table 8-13. The shift operators are binary and left-associative. The syntax of the bitwise shift operators is shown here. The number of positions to shift is given by Count. Operand << Count Operand >> Count // Left shift // Right shift

Shifts the bit pattern left by the given number of positions. The bits shifted off the left end are lost. Bit positions opening up on the right are filled with 0s. Shifts the bit pattern right by the given number of positions. Bits shifted off the right end are lost.

It s simple so far, but there s much more you can do with the system tray and its icons. Yes, each of your applications can add multiple icons to the system tray. To make the SimpleTray application interesting, you should first have your application detect when the tray icon is added or removed from the system tray. The SystemTray class allows you to add a PropertyChangeListener to detect these operations. Its addPropertyChangeListener() method requires you to pass in the property name to watch for changes. In the case of SystemTray, that name is trayIcons.

Sun Microsystems is the creator of the Java language and much of Java s supporting development software. The Java environment is, in other ways, at the leading edge of software development. Sun also manufactures computers built on a version of UNIX, although with a different set of GUIs from Apple s. In varying ways, both Apple and Sun gear their products to be multiplatform compatible.

For the vast majority of programming in C#, you don t need to know anything about the hardware underneath. If you re doing bitwise manipulation of signed numbers, however, it can be helpful to know about the numeric representation. The underlying hardware represents signed binary numbers in a form called two s complement. In two s-complement representation, positive numbers have their normal binary form. To negate a number, you take the bitwise negation of the number and add 1 to it. This process turns a positive number into its negative representation and vice versa. In two s complement, all negative numbers have a 1 in the leftmost bit position. Figure 8-6 shows the negation of the number 12.

tray.addPropertyChangeListener("trayIcons", propListener);

Figure 8-6. To get the negation of a two s-complement number, take its bitwise negation and add 1. The underlying representation is important when shifting signed numbers because the result of shifting an integral value one bit to the left is the same as multiplying it by two. Shifting it to the right is the same as dividing it by two. If, however, you were to shift a negative number to the right, and the leftmost bit were to be filled with a 0, it would produce the wrong result. The 0 in the leftmost position would indicate a positive number. But this is incorrect, because dividing a negative number by 2 does not produce a positive number.