如何初始化数组列表中的对象

Question

I am trying to initialize objects in my ArrayList

The following is my code and what it does is that it receives an ArrayList, already defined in the main method. However, it is not executing the readInput method in the code below. readInput is a method declared in another class called customer that takes in keyboard input from the user. Its a complete class BTW. I believe that there is no object in the ArrayList at the moment as i have run some test to see whats the problem. Im new to using Arraylist. Therefoere i am unsure of how to solve this proble. What custs.set(i, new customer()); does is actually to initialize the object in index.

public static void freeCustomer(ArrayList<customer> custs,
                                ArrayList<supplement>supps)
{
    for(int i=0;i<custs.size();i++)
    {

        custs.set(i, new customer());
        custs.get(i).readInput();
        for(int s=0;s<supps.size();s++)
        {
         supps.set(s, new supplement());
         supps.get(s).readInput();
        }
    }
}

Answer 1

If I understood right,you want to add user input from a customer method.I would use add method.I just made a fast example of add method.From here you can expand to loops,etc.

 public static void freeCustomer(ArrayList<customer> custo,customer c)
{
 custo.add(new customer(c.readInput()));

 }


    public static void main(String[] args) {   
        ArrayList<customer> custo = new ArrayList<customer>();
        customer c=new customer("");

        freeCustomer(custo,c);


        }
    }