Time1

// Fig 8.1: Time1.java
// Time1 class declaration maintains the time in 24-hours format.

public class Time1
{
    private int hour; // 0 -23
    private int minute; // 0 - 59
    private int second; // 0 - 59

    //set a new time value using universal time; throw an
    // exception if the hour, minute or second is invalid
    public void setTime(int h, int m, int s)
    {
        //validate hour, minute and second
        if ( ( h >= 0 && h < 24) && ( m >= 0 && m < 60 ) &&
            ( s >= 0 && s < 60 ) )
        {
            hour = h;
            minute = m;
            second = s;
        } // end if
        else
            throw new IllegalArgumentException(
                "hour, minute and/or second was out of range");
    } // end method setTime

    //convert to String in universal-time format (HH:MM:SS)
    public String toUniversalString()
    {
        return String.format( "%02d:%02d:%02d", hour, minute, second );
    } // end method toUniversalString

    // convert to String in standard-time format (GH:MM:SS AM or PM)
    public String toString()
    {
        return String.format( "%d:%02d:%02d %s",
            ( (hour ==0 || hour == 12 ) ? 12 : hour % 12 ),
            minute, second, ( hour < 12 ? "AM:" : "PM" ) );
    } // end method toString
} // end class Time1