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You can make your code explicitly raise an exception by using the throw statement. The syntax for the throw statement is the following: throw ExceptionObject; For example, the following code defines a method called PrintArg, which takes a string argument and prints it out. Inside the try block, it first checks to make sure that the argument is not null. If it is, it creates an ArgumentNullException instance and throws it. The exception instance is caught in the catch statement, and the error message is printed. Main calls the method twice: once with a null argument, and then with a valid argument. class MyClass { public static void PrintArg(string arg) { try { if (arg == null) Supply name of null argument { ArgumentNullException myEx = new ArgumentNullException("arg"); throw myEx; } Console.WriteLine(arg); } catch (ArgumentNullException e) { Console.WriteLine("Message: {0}", e.Message); } } } class Program { static void Main() { string s = null; MyClass.PrintArg(s); MyClass.PrintArg("Hi there!"); } } This code produces the following output: Message: Value cannot be null. Parameter name: arg Hi there!

This chapter has introduced some of the more visual items added to the latest desktop Java release. You learned about having fun with splash screens and the system tray. You explored the new modality options for pop-up windows, and discovered that you can now write GIF images without the risk of patent violations. Also on the AWT front were the latest antialiasing enhancements. In the Swing world, you explored the sorting and

The throw statement can also be used without an exception object, inside a catch block. This form rethrows the current exception, and the system continues its search for additional handlers for it. This form can only be used inside a catch statement. For example, the following code rethrows the exception from inside the first catch clause: class MyClass { public static void PrintArg(string arg) { try { try { if (arg == null) Supply name of null argument { ArgumentNullException myEx = new ArgumentNullException("arg"); throw myEx; } Console.WriteLine(arg); } catch (ArgumentNullException e) { Console.WriteLine("Inner Catch: {0}", e.Message); throw; } } Rethrow the exception, with no additional parameters catch { Console.WriteLine("Outer Catch: Handling an Exception."); } } } class Program { static void Main() { string s = null; MyClass.PrintArg(s); } }

Also, a form allows specifying choices from lists of available options, for example, by typing an X next to them. And a form can have a menu right on it; if there s not enough space for that, it can list a key or directive that displays the menu. So, even a nongraphic configuration can be made very user-friendly very clear all along the way.

This code produces the following output: Inner Catch: Value cannot be null. Parameter name: arg Outer Catch: Handling an Exception.

filtering enhancements to the JTable component, how the SwingWorker class was finally introduced to the standard platform libraries, and how to place components on tabs of a JTabbedPane. Printing text components is another feature added to Mustang, along with another round of improvements to drag-and-drop support. The next chapter takes you to the latest improvements to JDBC (the trademarked name that is not an acronym for Java Database Connectivity). You ll see how the 4.0 version of the API to access SQL data stores makes life even easier for you.

What Are Structs Structs Are Value Types Assigning to a Struct Constructors and Destructors Field Initializers Are Not Allowed Structs Are Sealed Boxing and Unboxing Structs As Return Values and Parameters Additional Information About Structs