//Time3.java
// Time3 class definition

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

public class Time3 {

   private int hour;     // 0 - 23
   private int minute;   // 0 - 59
   private int second;   // 0 - 59

   // Time3 constructor initializes each instance variable
   // to zero. Ensures that Time object starts in a 
   // consistent state.

   public Time3() { setTime( 0, 0, 0 ); }

   // Time3 constructor: hour supplied, minute and second
   // defaulted to 0.

   public Time3( int h ) { setTime( h, 0, 0 ); }

   // Time3 constructor: hour and minute supplied, second
   // defaulted to 0.

   public Time3( int h, int m ) { setTime( h, m, 0 ); }

   // Time3 constructor: hour, minute and second supplied.

   public Time3( int h, int m, int s ) { setTime( h, m, s ); }

   // Time3 constructor: another Time3 object supplied.

   public Time3( Time3 time )
   {
      setTime( time.getHour(), // in class Time2, this was written as the instance variable time.hour
               time.getMinute(),  
               time.getSecond() );
   }

   // Set (Mutator) Methods
   // 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 )

   {
      setHour( h );    // set the hour; in class Time2 was written as hour =((h>=0&&h<24)?h:0)
      setMinute( m );  // set the minute; here was are using separate mutator methods for each
      setSecond( s );  // set the second
   }

   // set the hour 

   public void setHour( int h ) 

      { hour = ( ( h >= 0 && h < 24 ) ? h : 0 ); }

   // set the minute 

   public void setMinute( int m ) 

      { minute = ( ( m >= 0 && m < 60 ) ? m : 0 ); }

   // set the second 

   public void setSecond( int s ) 

      { second = ( ( s >= 0 && s < 60 ) ? s : 0 ); }

   // Get (Accessor) Methods
   
   public int getHour() { return hour; } // because we are in the class, we can refer to the instance
   // variable by name in the method definition

   public int getMinute() { return minute; }

   public int getSecond() { return second; }

   // Convert to String in universal-time format

   public String toUniversalString()
   {
      DecimalFormat twoDigits = new DecimalFormat( "00" );
      return twoDigits.format( getHour() ) + ":" +
             twoDigits.format( getMinute() ) + ":" +
             twoDigits.format( getSecond() );
   }

   // Convert to String in standard-time format

   public String toString()
   {
      DecimalFormat twoDigits = new DecimalFormat( "00" );
      return ( ( getHour() == 12 || getHour() == 0 ) ? 
               12 : getHour() % 12 ) + ":" +
             twoDigits.format( getMinute() ) + ":" +
             twoDigits.format( getSecond() ) +
             ( getHour() < 12 ? " AM" : " PM" );
   }
}