//Time2.java
// Time2 class definition

import java.text.DecimalFormat;  // used for number formatting
// This class maintains the time in 24-hour format

public class Time2  {
   private int hour;     // 0 - 23
   private int minute;   // 0 - 59
   private int second;   // 0 - 59

   // Time2 constructor initializes each instance variable
   // to zero. Ensures that Time object starts in a 
   // consistent state.
   public Time2() { setTime( 0, 0, 0 ); }

   // Time2 constructor: hour supplied, minute and second
   // defaulted to 0.
   public Time2( int h ) { setTime( h, 0, 0 ); }

   // Time2 constructor: hour and minute supplied, second
   // defaulted to 0.
   public Time2( int h, int m ) { setTime( h, m, 0 ); }

   // Time2 constructor: hour, minute and second supplied.
   public Time2( int h, int m, int s ) { setTime( h, m, s ); }

   // Time2 constructor: another Time2 object supplied.
   public Time2( Time2 time )
   {
      setTime( time.hour, time.minute, time.second );
   }

   // 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 toString()
   {
      DecimalFormat twoDigits = new DecimalFormat( "00" );
      return ( (hour == 12 || hour == 0) ? 12 : hour % 12 ) +
             ":" + twoDigits.format( minute ) +
             ":" + twoDigits.format( second ) +
             ( hour < 12 ? " AM" : " PM" );
   }
}