How to add to an arraylist of class type

Question

Ok so this is what I have

public class Register { public String propertyID; public String PPSNumber; Register(String aPropertyID, String aPPSNumber) { propertyID = aPropertyID; PPSNumber = aPPSNumber; } public void setPPSNumber(String aPPSNumber) { PPSNumber = aPPSNumber; } public String getPPSNumber() { return PPSNumber; } public String getPropertyID() { return propertyID; } }

Then I have this

public static ArrayList<Register> registers = new ArrayList<Register>(); public static void main(String[] args) { String userInput1 = "", userInput2 = "", userInput3 = ""; userInput1 = JOptionPane.showInputDialog("Enter your PPSNumber"); userInput2 = JOptionPane.showInputDialog("Enter your propID"); registers.add("number", "id"); }

I don't understand why It wont let me add to the ArrayList. Is there some way of adding class types to ArrayLists?

How does one print out the arraylist registers. Also how do you add multiple registers eg. multiple ppsnumbers and ids? — hat_to_the_back
– hat_to_the_back, Commented Apr 20, 2013 at 20:49

Zakaria · Accepted Answer · 2013-04-20 20:51:27Z

4

Try this instead :

registers.add(new Register("number","id"));

EDIT 1: To answer your question, you can create a separate "register" and the use the getters :

Register aRegister = new Register("number","id"); registers.add(aRegister); System.out.println(aRegister.getPropertyID()+" "+ aRegister.getPPSNumber());

edited Apr 20, 2013 at 20:51

answered Apr 20, 2013 at 20:42

Zakaria

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3 Comments

hat_to_the_back Over a year ago

How do you print whats inside of register then?

hat_to_the_back Over a year ago

Thanks for the help one more question. Classes are new to me hence all the questions. I will be reading in alot of IDs and PPSNumbers into the registers arraylist. But I dont want to have to creat a new register (aRegister) for each id/property, that wouldnt work. How do I do that. Thanks again.

JB Nizet Over a year ago

@user2079139: Why wouldn't it work? It would work without any problem. Do that.

Community · Accepted Answer · 2017-05-23 12:23:50Z

Your List is of type Register so you need to add object of Register class only.

Nothing wrong in create as many Register objects as required.

You can implement toString() method inside Register class then the below sysout will work given the register variable is initialized with Register object. Check this How to override toString() properly in Java? to know about toString implementation.

System.out.println(register)

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