Display ImageIcon

Question

I am trying to display an imageIcon I want the image to be displayed once you have selected an item from the orderList JList the image

 DefaultListModel<MenuItem> orderList = new DefaultListModel<MenuItem>(); JList<MenuItem> listOrder = new JList<MenuItem> (orderList); listOrder.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent arg0) { MenuItem selectedItem = listOrder.getSelectedValue(); ImageIcon icon = selectedItem.getItemImage(); AbstractButton imageLabel = null; imageLabel.setIcon(icon); } }); listOrder.setFont(new Font("Arial", Font.PLAIN, 14)); listOrder.setBackground(Color.GRAY); listOrder.setBounds(506, 67, 317, 375); contentPane.add(listOrder);

MenuGUI

You should make sure that the button is added to a visible container, and obviously that it isn't null (so initialize it) .. — Arnaud
– Arnaud, Commented Mar 30, 2016 at 12:12

Sandeep Kokate · Accepted Answer · 2016-03-30 12:19:00Z

AbstractButton imageLabel = null; imageLabel.setIcon(icon);

This is not valid, You can't set imageLabel as null and then setting icon for it. If Image label is the Square box below "Item Image", then it should be initialized at class level and you need to just change the icon using setIcon and re validate then button using revalidate() method.

Jorge · Accepted Answer · 2016-03-30 12:15:42Z

This:

AbstractButton imageLabel = null; imageLabel.setIcon(icon);

Is going to raise a NullPointerException. Initialize the variable imageLabel properly. For example:

AbstractButton imageLabel = new JButton(icon);

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