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To avoid overstepping the bounds on an array use a length check to verify it has a length greater than 0 as well as using Length 1 in place of a hardcoded value when accessing the last item in the array (see Listing 249) Length returns the total number of elements in an array Therefore, if you had a multidimensional array such as bool cells[,,] of size 2 3 3, Length would return the total number of elements, 18 For a jagged array, Length returns the number of elements in the first array a jagged array is an array of arrays, so Length evaluates only the outside, containing array and returns its element count, regardless of what is inside the internal arrays

232 Arguments and results A method in a local object can modify objects passed as parameters, or it can modify some other object to which both it and the caller have access (eg static data) In either case, the modifications are visible to the caller A remote method cannot use this technique for communicating with its caller A remote object may still modify its parameters or other objects, but any such modifications are not visible to the caller A remote object can only communicate with its caller via return values or exceptions This has important consequences for the design of remote methods The reason for this restriction is that RMI's argument and result passing mechanism is different from Java's normal argument passing mechanism This is not a trivial observation Java supports two methods of passing arguments and returning results: "by value" and by "reference" When passing by value, data is copied The sender and receiver have different instances of the data If the called method modifies a parameter, the caller will not see any such change When passing by reference, a reference to the original value is passed in some languages, a pointer The sender and receiver both refer to the same data If the called method modifies a parameter, the change in its value will be seen by the caller When invoking local methods, Java passes primitive types by value, and object types by reference When invoking remote methods, RMI passes primitive types and object types by value except for exported remote objects, which are passed by reference "Pass by value" for values of type object is implemented as deep copy "Pass by reference" for exported remote objects is implemented by remote references remote stubs The reason for this is that, like pointers in other programming languages, references to Java objects are only valid within the memory in which they were created the "address space" of the virtual machine They have no meaning in the virtual machine at the other end of a remote method invocation A shallow copy is a bitwise copy The object itself is copied, but all object references in the object are unchanged, and continue to refer to the same objects as the original A deep copy is a copy in which the deep copied object itself is copied, and all objects referenced by the deep copied object are themselves deep copied A shallow copy yields the same object graph with a different root; a deep copy yields a new object graph equal to the original This is summarized in Table 21.

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Next, modify the updateTreeFromTextEditor() method, as folows so that the listener is removed from the old editor model before it is discarded and added to the new editor model

Arrays include additional methods for manipulating the elements within the array These include Sort(), BinarySearch(), Reverse(), and Clear() (see Listing 250)

class ProgrammingLanguages { static void Main() { string[] languages = new string[]{ "C#", "COBOL", "Java", "C++", "Visual Basic", "Pascal", "Fortran", "Lisp", "J#"}; SystemArraySort(languages); searchString = "COBOL";

void updateTreeFromTextEditor() { PropertyFile propertyFile = (PropertyFile) treeViewergetInput(); propertyFileremovePropertyFileListener(propertyFileListener); propertyFile = new PropertyFile( textEditor getDocumentProvider() getDocument(textEditorgetEditorInput()) get()); treeViewersetInput(propertyFile); propertyFileaddPropertyFileListener(propertyFileListener); }

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