8.1

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

public class Time1
{
    private int hour;
    private int minute;
    private int second;

    public void setTime(int h, int m, int s)
    {
        if ( ( h >= 0 && h < 24 ) && ( m >= 0 && m < 60 ) &&
        ( s >= 0 && s < 60 ) )
        {
            hour = h;
            minute = m;
            second = s;
        }

        else
            throw new IllegalArgumentException(
            "hour, minute and/or second was out of range" );

    }

    public String toUniversalString()
    {
        return String.format( "%02d:%02d:%02d", hour, minute, second );
    }

    public String toString()
    {
        return String.format( "%d:%02d:%02d %s",
        ( ( hour == 0 || hour == 12 ) ? 12 : hour % 12 ),
        minute, second, ( hour < 12 ? "AM" : "PM" ) );
    }
}