Web site template - 288 Object-Based Programming Chapter 8 34 output +=
288 Object-Based Programming Chapter 8 34 output += “nnAfter attempting invalid settings: ” + 35 “nUniversal time: ” + time.ToUniversalString() + 36 “nStandard time: ” + time.ToStandardString(); 37 38 MessageBox.Show( output, “Testing Class Time1″ ); 39 40 } // end method Main 41 42 } // end class TimeTest1 Fig. 8.2 Fig. 8.Fig.Fi 8.2g. 8.22Using an abstract data type. (Part 2 of 2.) Fig. 8. Software Engineering Observation 8.6 Note the relationship between operator new and the constructor of a class. When operator new creates an object of a class, that class s constructor is called to initialize the object s instance variables. Note that the TimeTest.cs file does not use keyword using to import the namespace that contains class Time1. If a class is in the same namespace as the class that uses it, the usingstatement is not required. Every class in C# is part of a namespace. If a programmer does not specify a namespace for a class, the class is placed in the default namespace, which includes all compiled classes in the current directory that do not reside in a namespace. In Visual Studio, this current directory is the one in which the current project resides. We must specify usingstatements for classes from the .NET Framework, because they are defined outside the namespace of each new application we create. Note that usingstatements are not required if the program fully qualifies the name of each class by preceding the class name with its namespace name and a dot operator. For example, a program can invoke class MessageBox s Showmethod as follows: System.Windows.Forms.MessageBox.Show( “Your message here” ); However, such lengthy names can be cumbersome. Line 14 declares string reference output to store the string containing the results, which later will be displayed in a MessageBox. Lines 17 20 assign to output the time in universal-time format (by invoking method ToUniversalString of the Time1 object) and standard-time format (by invoking method ToStandardStringof the Time1 object). Note the syntax of the method call in each case the reference time is followed by a the member access operator (.) followed by the method name. The reference name specifies the object that will receive the method call.
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