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The try statement allows you to designate blocks of code to be guarded for exceptions, and to supply code to handle them if they occur. The try statement consists of three sections, as shown in Figure 11-1. The try block contains the code that is being guarded for exceptions. The catch clauses section contains one or more catch clauses. These are blocks of code to handle the exceptions. They are also known as exception handlers. The finally block contains code to be executed under all circumstances, whether or not an exception is raised.

The previous example showed that attempting to divide by 0 causes an exception. You can modify the program to handle that exception by placing the code inside a try block and supplying a simple catch clause. When the exception is raised, it is caught and handled in the catch block. static void Main() { int x = 10; try { int y = 0; x /= y; } catch { ... // Code to handle the exception // Raises an exception

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; }

Console.WriteLine("Handling all exceptions - Keep on Running"); } } This code produces the following message. Notice that, other than the output message, there is no indication that an exception has occurred.

Of course, a significant issue in any project is how long it takes to complete. And, of course, predictions of how long it will take are directly related. When predictions are substantially low, they tend to cause undue pressure, extreme stress, poor communication, severe mistakes, runaway finger-pointing, and pervasive burnout. And inaccurate predictions are fueled by a lack of relevant statistics, especially when a set of technologies is new to a company, and even more when the technologies themselves are new. All of this is combatted with continually updated project actuarial tables. One very useful type can be compiled with statistics from projects across many companies, which can remain anonymous, as general standards. The other type is compiled by each company for itself, with statistics from its projects, to account for its individual combination of circumstances and to allow self-monitoring against the standards. This effort provides for highly educated guesses.

There are many different types of exceptions that can occur in a program. The BCL defines a number of exception classes, each representing a specific type. When one occurs, the CLR Creates an exception object for the type Looks for an appropriate catch clause to handle it All exception classes are ultimately derived from the System.Exception class. A portion of the exception inheritance hierarchy is shown in Figure 11-2.

The importData() method is a little more complicated. Essentially, you have to get the data, find the right place in the TreePath for the insertion, create the node, insert it, and, to be nice, make sure that the newly inserted node is visible. Listing 4-12 includes the importData() definition, along with the complete source used to generate Figure 4-26.

Figure 11-2. Structure of the exception hierarchy An exception object contains read-only properties with information about the exception that caused it. Some of these properties are shown in Table 11-1. Table 11-1. Selected Properties of an Exception Object

his chapter lays out relationships among user and storage interfaces, and some of their implementations in various computer environments.

import import import import import import java.awt.*; java.awt.datatransfer.*; java.awt.event.*; java.io.*; javax.swing.*; javax.swing.tree.*;

This property contains an error message explaining the cause of the exception. This property contains information describing where the exception occurred. If the current exception was raised by another exception, this property contains a reference to the previous exception. This property can be set by application-defined exceptions to give a URN or URL for information on the cause of the exception. If not set by an application-defined exception, this property contains the name of the assembly where the exception originated.

The catch clause handles exceptions. There are three forms, allowing different levels of processing. The forms are shown in Figure 11-3.