Question

I did search on internet, but still don’t understand, so I ask this question here.

in the small program below, I created two tour instance, all I want to do is putting tour[2] in without changing “Tour tour[]=new Tour[2];”.

A lot of people recommend ArrayList, but I don’t know how to do it in this code.

class Test{
public static void main(String args[]){

    class Tour{
        private String tourId;
        private String tourDescription;
        private double tourFee;
        private int numOfBooking;

        public Tour(String tourId,String tourDescription,double tourFee){
            this.tourId=tourId;
            this.tourDescription=tourDescription;
            this.tourFee=tourFee;
        }

        public void print(){
            System.out.println("ID:"+this.tourId);
            System.out.println("Desc:"+this.tourDescription);
            System.out.println("Fee:"+this.tourFee);
        }
    }


    Tour tour[]=new Tour[2];
    tour[0]=new Tour("AB001","TOUR1",100);
    tour[1]=new Tour("AB002","TOUR2",200);
}
}

Answer 1

As you discovered, arrays are indeed fixed length, and as such I would definitely recommend an ArrayList. Use it like this…

ArrayList<Tour> tours = new ArrayList<Tour>();
tours.add(new Tour("AB001","TOUR1",100));
tours.add(new Tour("AB002","TOUR2",200));

Every time you want to add a new Tour, just call tours.add() again.