Arraylist java program

Question

Help in writing a program using the array list which stores the values of name, address, phone number, date and time (for each customer) and later I need to retrieve the specific information like all the customer's name on a specified date. any help is appreciated.

Code:

public class Details {
 public static void main(String args[]) throws IOException {
 InputStreamReader rdr = new InputStreamReader(System.in);
 BufferedReader br = new BufferedReader(rdr);
 String s;
 s = br.readLine();
 System.out.println("PLEASE ENTER CLIENT NAME");
 String name = br.readLine();
 System.out.println("PLEASE ENTER CLIENT ADDRESS");
 String add = br.readLine();
 System.out.println("PLEASE ENTER CLIENT CONTACT PHONE NUMBER");
 String pnum = br.readLine();
 List list = new ArrayList();
 list.add("name");
 list.add("add");
 list.add("pnum");
 list.add("food");
 }
}

• Turing85: StackOverflow is not a website to generate code for you. Show us what you got, ask specific questions about the things you do not understand (after looking up the question on Google/Stackoverflow).
• ranjit kumar: public class Details { public static void main(String args[]) throws IOException { InputStreamReader rdr = new InputStreamReader(System.in); BufferedReader br = new BufferedReader(rdr); String s; s = br.readLine(); System.out.println("PLEASE ENTER CLIENT NAME"); String name= br.readLine(); System.out.println("PLEASE ENTER CLIENT ADDRESS"); String add= br.readLine(); System.out.println("PLEASE ENTER CLIENT CONTACT PHONE NUMBER"); String pnum= br.readLine(); List list = new ArrayList(); list.add("name"); list.add("add"); list.add("pnum"); list.add("food"); } }
• Roger Gustavsson: Update your question with the code, indented 4 spaces. Difficult to read in a comment.
• ranjit kumar: i accepted the data dynamically from user and added to array list but can i add all the details in the same index like the index 0 contains all info of a particular customer
• ranjit kumar: after creating a array list --> List list = new ArrayList() i added the details of name, address pnum and food for only one customer like list.add ("name") is there a way i can add name, address, pnum, food in the index zero of arraylist but not in different indexes

Answer 1

Create a class Customer like this -

public class Customer{
 private String name; 
 private String address;
 private String phoneNumber;
 private Date date;
 public Customer(name, address, phoneNumber, date){
 this.name = name;
 this.address = address;
 this.phoneNumber = phoneNumber;
 this.date = date;
 }
 //getters and setters method
}

After that you create an ArrayList of Customer like this -

List<Customer> `customerList` = new ArrayList<Customer>(); 

Now create an object/instance of Customer like this -

Customer aCustomer = new Customer("ranjit", "someAddress", "023-859 74", new Date() );

Then add the Customer object/instance aCustomer to ArrayList of Customer - customerList like this:

customerList.add(aCustomer);

In the given way you can more easily handle a Customer. Now you have a single entity containing all the customer attributes (name, address, phoneNumber etc). So you don't need store all the attributes/property in separate ArrayList

• ranjit kumar: System.out.println("Enter the appointment ID to see the full details :"); int y=in.nextInt(); int r; for(r=0;r<count;r++) { if(all.get(r).getID()==y) { all.get(r).display(); } }i am using this code to retrieve the full details that have been entered using the get statement and display function. this is a small part of my program. i was wondering is there any other way to do it