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public class DndTree { public static void main(String args[]) { Runnable runner = new Runnable() { public void run() { JFrame f = new JFrame("D-n-D JTree"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel top = new JPanel(new BorderLayout()); JLabel dragLabel = new JLabel("Drag me:"); JTextField text = new JTextField(); text.setDragEnabled(true); top.add(dragLabel, BorderLayout.WEST); top.add(text, BorderLayout.CENTER); f.add(top, BorderLayout.NORTH); final JTree tree = new JTree(); final DefaultTreeModel model = (DefaultTreeModel)tree.getModel(); tree.setTransferHandler(new TransferHandler() { /** * Returns true if flavor of data is string, operation is * a drop operation, and path is non-null. */ public boolean canImport(TransferHandler.TransferSupport support) { if (!support.isDataFlavorSupported(DataFlavor.stringFlavor) || !support.isDrop()) { return false; } JTree.DropLocation dropLocation = (JTree.DropLocation)support.getDropLocation(); return dropLocation.getPath() != null; } /** * Performs actual import operation. Returns true on success * and false otherwise. */ public boolean importData(TransferHandler.TransferSupport support) { if (!canImport(support)) { return false; }

Comprehensively understanding a piece of software begins with understanding its overall processing flow. And that begins with the overall flow of its user request processing. This is made much clearer by examination of the history of approaches.

Figure 11-3. The three forms of the catch clause The general catch clause can accept any exception, but can t determine the type of exception that caused it. This allows only general processing and cleanup for whatever exception might occur. The specific catch clause form takes the name of an exception class as a parameter. It matches exceptions of the specified class or exception classes derived from it. The specific catch clause with object form gives you the most information about the exception. It matches exceptions of the specified class, or exception classes derived from it. It also gives you an exception instance, called the exception variable, which is a reference to the exception object created by the CLR. You can access the exception variable s properties within the block of the catch clause to get specific information about the exception raised. For example, the following code handles exceptions of type IndexOutOfRangeException. When one occurs, a reference to the actual exception object is passed into the code with parameter name e. The three WriteLine statements each read a string field from the exception object. Exception type Exception variable catch ( IndexOutOfRangeException e ) { Accessing the exception variable Console.WriteLine( "Message: {0}", e.Message ); Console.WriteLine( "Source: {0}", e.Source ); Console.WriteLine( "Stack: {0}", e.StackTrace );

// Fetch the drop location JTree.DropLocation dropLocation = (JTree.DropLocation)support.getDropLocation(); // Fetch the tree path TreePath path = dropLocation.getPath(); // Fetch the transferable object Transferable transferable = support.getTransferable(); // Fetch the transfer data in the proper format // from the transferable object String transferData; try { transferData = (String)transferable.getTransferData( DataFlavor.stringFlavor); } catch (IOException e) { return false; } catch (UnsupportedFlavorException e) { return false; } // Fetch the drop location int childIndex = dropLocation.getChildIndex(); // -1 means drop location is parent node, which is translated to end if (childIndex == -1) { childIndex = model.getChildCount(path.getLastPathComponent()); } // Create new node DefaultMutableTreeNode newNode = new DefaultMutableTreeNode(transferData); // Insert new node at proper location DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode)path.getLastPathComponent(); model.insertNodeInto(newNode, parentNode, childIndex); // Make new node visible TreePath newPath = path.pathByAddingChild(newNode); tree.makeVisible(newPath); tree.scrollRectToVisible(tree.getPathBounds(newPath));

Going back to our divide-by-zero example, the following code modifies the previous catch clause to specifically handle exceptions of the DivideByZeroException class. While in the previous example, the catch clause would handle any exception raised in the try block, the current example will only handle those of the DivideByZeroException class. int x = 10; try { int y = 0; x /= y; // Raises an exception } Exception type catch ( DivideByZeroException ) { ... Console.WriteLine("Handling an exception."); } You could further modify the catch clause to use an exception variable. This allows you to access the exception object inside the catch block. int x = 10; try { int y = 0; x /= y; // Raises an exception } Exception type Exception variable catch ( DivideByZeroException e ) { Accessing the exception variable Console.WriteLine("Message: {0}", e.Message ); Console.WriteLine("Source: {0}", e.Source ); Console.WriteLine("Stack: {0}", e.StackTrace ); } This code produces the following output: Message: Attempted to divide by zero. Source: Exceptions 1 Stack: at Exceptions_1.Program.Main() in C:\Progs\Exceptions 1\ Exceptions 1\Program.cs:line 14