Web server certificate - 310 Object-Based Programming Chapter 8 1 // Fig.
310 Object-Based Programming Chapter 8 1 // Fig. 8.11: Time4.cs 2 // Class Time4 provides overloaded constructors. 3 4 using System; 5 6 // Time4 class definition 7 public class Time4 8 { 9 private int hour; // 0-23 10 private int minute; // 0-59 11 private int second; // 0-59 12 13 // constructor 14 public Time4( int hour, int minute, int second ) 15 { 16 this.hour = hour; 17 this.minute = minute; 18 this.second = second; 19 } 20 21 // create string using this and implicit references 22 public string BuildString() 23 { 24 return “this.ToStandardString(): ” + 25 this.ToStandardString() + 26 “nToStandardString(): ” + ToStandardString(); 27 } 28 29 // convert time to standard-time (12-hour) format string 30 public string ToStandardString() 31 { 32 return String.Format( “{0}:{1:D2}:{2:D2} {3}”, 33 ( ( this.hour == 12 || this.hour == 0 ) ? 12 : 34 this.hour % 12 ), this.minute, this.second, 35 ( this.hour < 12 ? "AM" : "PM" ) ); 36 } 37 38 } // end class Time4 Fig. 8.11 Fig. 8.11Fig. 8.FiFi11g. 8.11g. 8.11thisreference used implicitly and explicitly to enable an object to manipulate its own data and invoke its own methods. (Part 1 of 2) Method BuildString (lines 22 27) returns a string created by a statement that uses the thisreference explicitly and implicitly. Line 25 uses the thisreference explicitly to call method ToStandardString, whereas line 26 uses the this reference implicitly to call the same method. Note that both lines perform the same task. Therefore, programmers usually do not use the thisreference explicitly to reference methods within the current object. Common Programming Error 8.4 For a method in which a parameter (or local variable) has the same name as an instance variable, use reference this if you wish to access the instance variable; otherwise, the method parameter (or local variable) will be referenced.
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