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When defining bit fields, you might not want to allow certain combinations. For example, you might reject the saucy combination, requiring customers to pick, at most, one kind of sauce. Unfortunately, there are no language or platform mechanisms for enforcing that kind of constraint, so you d need to write code to check for illegal combinations in any method that accepted arguments of this type. (Or you could consider an alternative design that does not use an enum at all.)

If you don t specify explicit values, the first item in your list is effectively the default value for the enum (because it corresponds to the zero value). If you provide explicit values, be sure to define a value that corresponds to zero if you don t, fields using your type will default to a value that s not a valid member of the enum, which is not desirable.

We can now access the enumeration property like this:

someBoeing777.Direction = DirectionOfApproach.Approaching;

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We ve clearly made some progress with our Plane class, but we re not done yet. We have a read-only property for its Identifier. We can store the speed, which we can get and set using two different properties representing different units, using a const field for the conversion factor. And we know the direction, which will be either the Approach ing or the Leaving member of an enum. We still need to store the aircraft s position. According to the specification, we ve got two polar coordinates (an angle and a distance) for its position on the ground, and another value for its height above sea level. We re likely to need to do a lot of calculations based on this position information. Every time we want to create a function to do that, we d need three parameters per point, which seems overly complex. (And error-prone it d be all too easy to inadvertently pass two numbers from one position, and a third number from a different position.) It would be nicer if we could wrap the numbers up into a single, lightweight, 3D point type that we can think of in the same kind of way we do int or double a basic building block for other classes to use with minimum overhead. This is a good candidate for a value type.

The encrypt() method first generates some random bytes to serve as the IV, and stores those bytes in the ivSpec object Then, the method initializes the cipher object to be in encrypt mode, and passes it the secret key and IV The method then constructs a CipherOutputStream object from the output stream passed to encrypt() and the cipher object Any data that is written to the CipherOutputStream object is first enciphered, and then written to the output stream Once the CipherOutputStream object is initialized, the method then enters a loop in which data is read from the input stream and written to CipherOutputStream until all the data from the input stream has been consumed Finally, the CipherOutputStream object is closed, and any remaining unencrypted bytes are padded, encrypted, and written If the output stream is a file or a network socket, it will be closed.

So far, we ve been building a class. When creating an instance of the class, we stored it in a named variable, as Example 3-24 shows.

Plane someBoeing777 = new Plane("BA0049"); someBoeing777.Direction = DirectionOfApproach.Approaching;

We can define another variable with a different name, and store a reference to the same plane in that new variable, as shown in Example 3-25.

Plane theSameBoeing777ByAnotherName = someBoeing777;

The Popfly team has created a software development kit (SDK) for blocks. You can get the SDK from the Popfly site s block creation area, accessible by clicking Create Stuff Block; see Figure 8-1.

If we change a property through one variable, that change will be visible through the other. Example 3-26 modifies our plane s Direction property through the second variable, but then reads it through the first variable, verifying that they really are referring to the same object.

The decrypt() method is similar to the encrypt() method, except that it reads the IV and ciphertext from the input stream, and writes plaintext to the output stream: public void decrypt(InputStream in, OutputStream out) throws Exception { // read IV first inread(ivBytes); ivSpec = new IvParameterSpec(ivBytes); cipherinit(CipherDECRYPT_MODE, secretKey, ivSpec); // Bytes read from in will be decrypted CipherInputStream cipherIn = new CipherInputStream(in, cipher); // Read in the decrypted bytes and write the plaintext to out int numRead = 0; while ((numRead = cipherInread(buf)) >= 0) outwrite(buf, 0, numRead); outclose(); } Now that we have described the most important subroutines in AESEncrypter, we show how the program s main() method brings it all together: public static void main (String argv[]) throws Exception { if (argvlength != 2) usage(); String operation = argv[0]; String keyFile = argv[1]; if (operation.

theSameBoeing777ByAnotherName.Direction = DirectionOfApproach.Leaving; if (someBoeing777.Direction == DirectionOfApproach.Leaving) { Console.WriteLine("Oh, they are the same!"); }

As Shakespeare might have said, if only he d found his true vocation as a C# developer:

Assuming you like the smell of jet fuel. When we define a type using class, we always get this behavior our variables behave as references to an underlying object. We therefore call a type defined as a class a reference type.

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