New to Java

Hi, I'm new to java and need a slight nudge in the right direction. I have a customer table in my database and I want to display the values of a row of that table in jlabels when a button is pressed. I think I have most of the code in place, but am not really sure how to transfer the data between the different classes in the application.

Firstly, I have a Menu class which contains the button and jlabels, a DatabaseIO class which contains the connection and query etc and a list class for the customer.

Here is the code for the button in the Menu class

private void initGUI() {
		try
							searchCustomerButton = new JButton();
							searchCustomerButton.setText("Search");
							searchCustomerButton.addActionListener(new ActionListener() {
								public void actionPerformed(ActionEvent evt) {
									System.out.println("searchCustomerButton.actionPerformed, event="+evt);
									String i;
									int id;
									i = cusIDSearchField.getText();
									id = Integer.parseInt(i);
									DatabaseIO.getCustomers(id);

This is the code in the DatabaseIO class

public static CustomerList getCustomers(int id){
    	
        String query = 	"SELECT * FROM customer WHERE customerID = '"+id+"'";
        
        CustomerList listOfCustomers = new CustomerList();
//     	System.out.println("setting up list");   
        try{
        	
        	Statement stmt = con.createStatement();
//        	System.out.println("statement created");
        	ResultSet rs = stmt.executeQuery(query);
    		while (rs.next()) {
                String fn = rs.getString("firstName");
                String ln = rs.getString("lastName");
                System.out.println("Name: " + fn + " " + ln);
                String ca = rs.getString("address");
                System.out.println("Address: " + ca + " ");
                String pn = rs.getString("phoneNumber");
                System.out.println("Phone Number: " + pn);
                int dp = rs.getInt("depositPercentage");
                System.out.println("Deposit: " + dp + "%  ");
                double cb = rs.getDouble("budget");
                System.out.println("Extras Budget: ?" + cb);
                System.out.println("");
                Customer tempCustomer = new Customer(fn,ln,ca,pn,dp,cb);
                listOfCustomers.add(tempCustomer);
    		}
    	}
        catch (Exception e){
        	System.out.println("customers error " + e);
        }
        return listOfCustomers;
        }

Here is the code in the list class

public boolean addCustomers(Customer customer) {
		return customers.add(customer);
	}

The query obviously works as all the relevant data gets displayed in the console but can anyone help me work out how to get it to display in the labels on the menu? Thanks in advance.