HoursOfDay.java

for (int i = 0; i <24; i++){ //counter for 24 hour clock
    String suffix = ":00";
    //suffix changes to pm from 12 onwards
    if (i < 12){
        suffix += "am";
    } else {
        suffix += "pm";
    }
    //am - hours are the same as 24 hour clock
    int hour = i; //we don't change i as it would mess up the loop
    if (i > 12 ){
        //pm hours are 12 less than 24 hour clock
        hour -= 12;
    }
    System.out.println(hour + suffix);
}