// Time2.java類的定義
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 );
      }
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 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()
      {
         return  hour  + ":" + minute + ":" + second ;
      } 
      // convert to String in standard-time format
      public String toString()
      {
return ((hour == 12 || hour == 0) ? 12 : hour % 12 ) +":" + minute+":" + second + ( hour < 12 ? " AM" : " PM" );
      }
public static void main( String args[] )
      {
         Time2 t1, t2, t3, t4, t5, t6;   
         t1 = new Time2();               // 00:00:00
         t2 = new Time2( 2 );            // 02:00:00
         t3 = new Time2( 21, 34 );       // 21:34:00
         t4 = new Time2( 12, 25, 42 );   // 12:25:42
         t5 = new Time2( 27, 74, 99 );   // 00:00:00
         t6 = new Time2( t4 );           // 12:25:42
	 System.out.println(t1.toUniversalString()+'\t'+ t1.toString());
	 System.out.println(t2.toUniversalString()+'\t'+ t2.toString());
	 System.out.println(t3.toUniversalString()+'\t'+ t3.toString());
	 System.out.println(t4.toUniversalString()+'\t'+ t4.toString());
	 System.out.println(t5.toUniversalString()+'\t'+ t5.toString());
	 System.out.println(t6.toUniversalString()+'\t'+ t6.toString());
    		 }
}