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There are three situations in which an explicit reference conversion will succeed at run time that is, not raise an InvalidCastException exception. The first case is where the explicit conversion is unnecessary that is, where the language would have performed an implicit conversion for you anyway. For example, in the code that follows, the explicit conversion is unnecessary because there is always an implicit conversion from a derived class to one of its base classes. class A { } class B: A { } ... B myVar1 = new B(); A myVar2 = (A) myVar1;

The second case is where the source reference is null. For example, in the following code, even though it would normally be unsafe to convert a reference of a base class to that of a derived class, the conversion is allowed because the value of the source reference is null. class A { } class B: A { } ... A myVar1 = null; B myVar2 = (B) myVar1;

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A point in an interval where an injection can add logic. In the referenced interval, an inlet name, surrounded by double angle brackets, in the second column.

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The third case is where the actual data pointed to by the source reference could safely be converted implicitly. The following code shows an example, and Figure 18-21 illustrates the code. The implicit conversion in the second line makes myVar2 think that it is pointing to data of type A, while it is actually pointing to a data object of type B. The explicit conversion in the third line is casting a reference of a base class to a reference of one of its derived classes. Normally this would raise an exception. In this case, however, the object being pointed to actually is a data item of type B. B myVar1 = new B(); A myVar2 = myVar1; B myVar3 = (B)myVar2;

5.0 6.0

Besides instance fields, classes can also have static fields. A static field is shared by all the instances of the class, and all the instances access the same memory location. Hence, if the value of the memory location is changed by one instance, the change is visible to all the instances. Use the static modifier to declare a field static, as follows: class D { int Mem1; static int Mem2; } Keyword

For example, the code on the left in Figure 6-3 declares class D with static field Mem2 and instance field Mem1. Main defines two instances of class D. The figure shows that static field Mem2 is stored separately from the storage of any of the instances. The gray fields inside the instances represent the fact that, from inside the instance, the static field looks like any other member field. Because Mem2 is static, both instances of class D share a single Mem2 field. If Mem2 is changed in one instance, it is changed in the other as well. Member Mem1 is not declared static, so each instance has its own copy.

A class that has all interface-only intervals. Identified with just interface only as its first statement.

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In the previous chapter, you saw that dot-syntax notation is used to access instance members from outside the class. Dot-syntax notation consists of listing the instance name, followed by a dot, followed by the member name. Static members, like instance members, are also accessed from outside the class using dotsyntax notation. But since there is no instance, you must use the class name, as shown here: Class name D.Mem2 = 5; Member name

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The following code expands the preceding class D by adding two methods: One method sets the values of the two data members. The other method displays the values of the two data members. class D { int Mem1; static int Mem2; public void SetVars(int v1, int v2) // Set the values { Mem1 = v1; Mem2 = v2; } Access as if it were an instance field public void Display( string str ) { Console.WriteLine("{0}: Mem1= {1}, Mem2= {2}", str, Mem1, Mem2); } } Access as if it were an instance field class Program { static void Main() { D d1 = new D(), d2 = new D(); // Create two instances. d1.SetVars(2, 4); d1.Display("d1"); d2.SetVars(15, 17); d2.Display("d2"); d1.Display("d1"); } } // Set d1's values.

A header statement that has the interval name enclosed in angle brackets, followed by the interval s return component definition, followed by the interaction properties.

// Display d1 again and notice that the // value of static member Mem2 has changed!

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