How can I display an arraylist in a JList?

Question

I want to display the all the details of elements in arraylist bikes in a Jlist. I've been trying to figure out how to do this for a while but I just can't crack it. The Jlist is part of a panel called pnlBikesTab.

ArrayList and JList

 ArrayList<Bike> bikes = new ArrayList<Bike>(); JList<String> lstBikes ;

Populating Arraylist

 public void Intial(){ //Add 12 bikes Bike b1 = new Bike(1, "Mountain", 12, "Not available") ; Bike b2 = new Bike(2, "Road", 10, "Available") ; Bike b3 = new Bike(3, "City", 8, "Available") ; Bike b4 = new Bike(4, "Mountain", 12, "Available") ; Bike b5 = new Bike(5, "Road", 10, "Available") ; Bike b6 = new Bike(6, "City", 8, "Available") ; Bike b7 = new Bike(7, "Mountain", 12, "Available") ; Bike b8 = new Bike(8,"Road", 10, "Available") ; EBike b9 = new EBike(9, "eBike", 18, "Not available", "Full Power") ; EBike b10 = new EBike(10, "eBike", 18, "Available", "Full Power"); EBike b11 = new EBike(11, "eBike", 14, "Available", "Power Assist") ; EBike b12 = new EBike(12, "eBike", 14, "Available", "Power Assist") ; bikes.add(b1) ; bikes.add(b2) ; bikes.add(b3) ; bikes.add(b4) ; bikes.add(b5) ; bikes.add(b6) ; bikes.add(b7) ; bikes.add(b8) ; bikes.add(b9) ; bikes.add(b10) ; bikes.add(b11) ; bikes.add(b12) ; }

Main

 public static void main(String[] args){ BikeNowGUI fr = new BikeNowGUI(); fr.Intial(); fr.setTitle("Bikes") ; fr.setLocationRelativeTo(null); //Center frame fr.setSize(300, 500); fr.setVisible(true); }

GUI

public BikeNowGUI(){ tabs = new JTabbedPane() ; //BikesTab Panel pnlBikesTab = new JPanel() ; lblBikes = new JLabel("Bikes") ; pnlBikesTab.add(lblBikes) ; lblImages = new JLabel(icons[0]) ; pnlBikesTab.add(lblImages) ; //Jlist ArrayList<Bike> bikes = new ArrayList<Bike>(); Bike[] items = new Bike[bikes.size()]; bikes.toArray(items); lstBikes = new JList(items); pnlBikesTab.add(lstBikes) ; tabs.add("Bikes", pnlBikesTab) ; //CustomersTab Panel pnlCustomersTab = new JPanel(); tabs.add("Customers", pnlCustomersTab) ; //RentsTab Panel pnlRentsTab = new JPanel(); tabs.add("Rents", pnlRentsTab) ; add(tabs); }

You need to store the result of the toArray call, list.add(bikes.toArray()). — daniu
– daniu, Commented May 26, 2019 at 8:20
list is your JList. lstBikes = new JList(bikes.toArray ()) . — daniu
– daniu, Commented May 26, 2019 at 8:32

John Joe · Accepted Answer · 2019-05-26 08:38:42Z

1

@daniu is right. You can use this

lstBikes = new JList(bikes.toArray());

Another thing is that bikes will always return size 0 in BikeNowGUI because you are calling BikeNowGUI first before Initial method. I would suggest you move all the code to Initial method.

answered May 26, 2019 at 8:38

John Joe

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2 Comments

John Joe Over a year ago

@LachlanWilliamson did you move all the code to BikeNowGUI ?

Lachlan Williamson Over a year ago

Yes. Now the elements arraylist appear in the listbox.

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