java - ArrayList方法添加错误

Question

错误是客户有不同的 ID，但在 ArrayList 类的 readCustomer 对象中，唯一保存的 ID 是最后一个客户的 ID。

//reads customer data from register.txt file
//has 2 string as arguments
//returns a ArrayList object with all the customer with the same name

public ArrayList<Customer> readCustomer(String name,String surname){

    Customer temp = new Customer();

    //will hold all the customers with the same name and surname
    ArrayList<Customer> readCustomer = new ArrayList<Customer>();        

    try{
        FileInputStream fstream = new FileInputStream("register.txt");
        BufferedReader fbr = new BufferedReader(new InputStreamReader(fstream));
        String strLine;
        while ((strLine = fbr.readLine()) != null)   {

            String line[];
            line = strLine.split(" ");                
            if(name.equals(line[1]) && surname.equals(line[2])){

                temp.setCustomerID(Integer.parseInt(line[0]));
                temp.setName(line[1]);
                temp.setSurname(line[2]);
                temp.setAddress(line[3]);
                temp.setAge(Integer.parseInt(line[4]));                    
                readCustomer.add(temp);                   

            }
        }
        fbr.close();
    }
    catch(Exception ex){*emphasized text*
        System.out.println(ex.getMessage());            
    }    

    return readCustomer;        
}

Answer 1

在每次迭代时创建一个新对象，而不是重复填充的对象。此外，学习理解对象引用。

while ((strLine = fbr.readLine()) != null)   {
    Customer temp = new Customer();

    // and so on