time1.java

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// Fig. 8.1: Time1.java
// Time1 class declaration maintains the time in 24-hour format.
import java.text.DecimalFormat; 

public class Time1 extends Object {
   private int hour;     // 0 - 23
   private int minute;   // 0 - 59
   private int second;   // 0 - 59

   // Time1 constructor initializes each instance variable to zero; 
   // ensures that each Time1 object starts in a consistent state
   public Time1()
   {
      setTime( 0, 0, 0 );
   }

   // set a new time value using universal time; perform 
   // validity checks on the data; set invalid values to zero
   public void setTime( int h, int m, int s )
   {
      hour = ( ( h >= 0 && h < 24 ) ? h : 0 );
      minute = ( ( m >= 0 && m < 60 ) ? m : 0 );
      second = ( ( s >= 0 && s < 60 ) ? s : 0 );
   }

   // convert to String in universal-time format
   public String toUniversalString()
   {
      DecimalFormat twoDigits = new DecimalFormat( "00" );

      return twoDigits.format( hour ) + ":" +
         twoDigits.format( minute ) + ":" + twoDigits.format( second );
   }

   // convert to String in standard-time format
   public String toStandardString()
   {
      DecimalFormat twoDigits = new DecimalFormat( "00" );
      
      return ( (hour == 12 || hour == 0) ? 12 : hour % 12 ) + ":" + 
         twoDigits.format( minute ) + ":" + twoDigits.format( second ) +
         ( hour < 12 ? " AM" : " PM" );
   }

} // end class Time1

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