// 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