// Fig. 9.32: Time.java
// Time class definition.

// Java core packages
import java.text.DecimalFormat;  

// This class maintains the time in 24-hour format
public class Time extends Object {
   private int hour;     // 0 - 23
   private int minute;   // 0 - 59
   private int second;   // 0 - 59

   // Time constructor initializes each instance variable
   // to zero. Ensures that Time object starts in a 
   // consistent state.
   public Time() 
   {
      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 hour, int minute, int second )
   {
      setHour( hour );      
      setMinute( minute );  
      setSecond( second );  
   }

   // validate and set hour 
   public void setHour( int h ) 
   { 
      hour = ( ( h >= 0 && h < 24 ) ? h : 0 ); 
   }

   // validate and set minute 
   public void setMinute( int m ) 
   { 
      minute = ( ( m >= 0 && m < 60 ) ? m : 0 ); 
   }

   // validate and set second 
   public void setSecond( int s ) 
   {
      second = ( ( s >= 0 && s < 60 ) ? s : 0 ); 
   }

   // get hour
   public int getHour()
   {
      return hour;
   }

   // get minute
   public int getMinute()
   {
      return minute;
   }

   // get second
   public int getSecond()
   {
      return second;
   }

   // 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" );
   }

}  // end class Time

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