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Reading a variable of a nullable type returns its value. You must, however, make sure that the variable is not null. Attempting to read the value of a null variable produces an exception. You can easily convert between a nullable type and its corresponding non-nullable type. There is an implicit conversion between a non-nullable type and its nullable version. That is, no cast is needed. There is an explicit conversion between a nullable type and its non-nullable version. For example, the following lines show conversion in both directions. In the first line, a literal of type int is implicitly converted to a value of type int and is used to initialize the variable of the nullable type. In the second line, the variable is explicitly converted to its nonnullable version. int myInt1 = 15; int regInt = (int) myInt1;

The called interval has inlet names, each preceded by the label inlet, to mark the inlet. And the call is continued with the keyword injections. The injection begins with the label injection and injection name followed by the statements to inject. And the call is ended with the keyphrase injections end on a line by itself. interval: Server Interval comment: some core statements inlet: Security -- Login comment: more core statements

There are three kinds of values you can assign to a variable of a nullable type: A value of the underlying type A value of the same nullable type The value null The following code shows an example of each of the three types of assignment: int myI1, myI2, myI3; myI1 = 28; myI2 = myI1; myI3 = null; // Value of underlying type // Value of nullable type // Null

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This package is primarily for the library support for the annotation facility. It includes four annotations that help annotation creators document the proper usage of their annotations. These were part of JDK 5.0, and are not new to Mustang. Documented: States whether the annotation should be documented by javadoc. Inherited: States that a parent class should be queried when an annotation is not found in main class. Retention: Identifies how long the annotation is retained. The enumeration RetentionPolicy offers three possible settings: SOURCE, CLASS, and RUNTIME. A setting of SOURCE means that the annotation is only needed to compile; CLASS means that the data is stored in the class file, but isn t necessarily used by the virtual machine (VM); and RUNTIME means that the VM retains it and thus can be read if requested. Target: Identifies the program element associated with the metadata. The ElementType enumeration offers eight possible values: ANNOTATION_TYPE, CONSTRUCTOR, FIELD, LOCAL_VARIABLE, METHOD, PACKAGE, PARAMETER, and TYPE.

Console.WriteLine("myI1: {0}, myI2: {1}", myI1, myI2); Console.WriteLine("myI3 {0} null", myI3 == null "is" : "is not"); This code produces the following output: myI1: 28, myI2: 28 myI3 is null

Next, you need to create a program that looks up a time zone, as shown in Listing 1-5.

The standard arithmetic and comparison operators also handle nullable types. There is also a new operator called the null coalescing operator, which allows you to return a value to an expression, in case a nullable type variable is null. The null coalescing operator consists of two contiguous question marks and has two operands: The first operand is a variable of a nullable type. The second is a non-nullable value of the same underlying type. If, at run time, the first operand evaluates to null, the second operand is returned as the result of the operation. Null coalescing operator int myI4 = null; Console.WriteLine("myI4: {0}", myI4 -1); myI4 = 10; Console.WriteLine("myI4: {0}", myI4 -1); This code produces the following output: myI4: -1 myI4: 10 The equality comparison operators, == and !=, have an interesting characteristic you need to be aware of. If you compare two values of the same nullable type, and both are null, the equality comparison operators consider them equal. For example, in the following code, the two nullable ints are set to null. The equality comparison operator will declare them equal. int i1 = null, i2 = null; if (i1 == i2) Console.WriteLine("Equal");

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