// Fig. 8.4: ThisTest.java
// this used implicitly and explicitly to refer to members of an object.

public class ThisTest 
{
   public static void main( String args[] )
   {
      SimpleTime time = new SimpleTime( 15, 30, 19 );
      System.out.println( time.buildString() );
   } // end main
} // end class ThisTest

// class SimpleTime demonstrates the "this" reference
class SimpleTime 
{
   private int hour;   // 0-23
   private int minute; // 0-59
   private int second; // 0-59 

   // if the constructor uses parameter names identical to 
   // instance variable names the "this" reference is 
   // required to distinguish between names
   public SimpleTime( int hour, int minute, int second )
   {
      this.hour = hour;      // set "this" object's hour
      this.minute = minute;  // set "this" object's minute
      this.second = second;  // set "this" object's second
   } // end SimpleTime constructor

   // use explicit and implicit "this" to call toUniversalString
   public String buildString()
   {
      return String.format( "%24s: %s\n%24s: %s", 
         "this.toUniversalString()", this.toUniversalString(),
         "toUniversalString()", toUniversalString() );
   } // end method buildString

   // convert to String in universal-time format (HH:MM:SS)
   public String toUniversalString()
   {
      // "this" is not required here to access instance variables, 
      // because method does not have local variables with same 
      // names as instance variables
      return String.format( "%02d:%02d:%02d", 
         this.hour, this.minute, this.second );
   } // end method toUniversalString
} // end class SimpleTime


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