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    <p>To show how easy it is to let two applications communicate with each other, check out this network-clipboard demo using JGroups. Just start two instances and begin dropping files into one of them. The second instance will instantly show the same files.</p> <pre><code>import java.io.Serializable; import java.awt.*; import java.awt.datatransfer.*; import javax.swing.*; import org.jgroups.*; public class JGroupsTest { public static void main(String[] args) throws Exception { final JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); frame.setSize(500, 300); final DefaultListModel listModel = new DefaultListModel(); final JList panel = new JList(listModel); panel.setBackground(new Color(128, 0, 40)); panel.setForeground(new Color(240, 240, 240)); frame.add(panel); System.setProperty("java.net.preferIPv4Stack", "true"); final JChannel channel = new JChannel("udp.xml"); channel.connect("networkclipboard"); channel.setReceiver(new ReceiverAdapter() { @Override public void viewAccepted(View newView) { frame.setTitle("Network Clipboard - " + channel.getLocalAddress()); } @Override public void receive(Message msg) { listModel.addElement(msg.getObject()); } }); panel.setTransferHandler(new TransferHandler() { @Override public boolean importData(JComponent comp, Transferable t) { DataFlavor[] transferDataFlavors = t.getTransferDataFlavors(); for (DataFlavor flavor : transferDataFlavors) { try { Object data = t.getTransferData(flavor); if (data instanceof Serializable) { Serializable serializable = (Serializable) data; Message msg = new Message(); msg.setObject(serializable); channel.send(msg); } } catch (Exception e) { e.printStackTrace(); } } return super.importData(comp, t); } @Override public boolean canImport(TransferSupport support) { return true; } @Override public boolean canImport(JComponent comp, DataFlavor[] transferFlavors) { return true; } }); } } </code></pre>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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