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We would expect the getAddCount method to return three at this point, but it returns six What went wrong Internally, HashSet's addAll method is implemented on top of its add method, although HashSet, quite reasonably, does not document this implementation detail The addAll ethod in InstrumentedHashSet added three to addCount and then invoked HashSet's addAll implementation using superaddAll This in turn invoked the add method, as overridden in InstrumentedHashSet, once for each element Each of these three invocations added one more to addCount, for a total increase of six: Each element added with the addAll method is double-counted We could fix the subclass by eliminating its override of the addAll method While the resulting class would work, it would depend for its proper function on the fact that HashSet's addAll method is implemented on top of its add method This self-use is an implementation detail, not guaranteed to hold in all implementations of the Java platform and subject to change from release to release Therefore, the resulting InstrumentedHashSet class would be fragile It would be slightly better to override the addAll method to iterate over the specified collection, calling the add method once for each element This would guarantee the correct result whether or not HashSet's addAll method were implemented atop its add method because HashSet's addAll implementation would no longer be invoked This technique, however, does not solve all our problems It amounts to reimplementing superclass methods that may or may not result in self-use, which is difficult, time-consuming, and error prone Additionally, it isn't always possible, as some methods cannot be implemented without access to private fields inaccessible to the subclass A related cause of fragility in subclasses is that their superclass can acquire new methods in subsequent releases Suppose a program depends for its security on the fact that all elements inserted into some collection satisfy some predicate This can be guaranteed by subclassing the collection and overriding each method capable of adding an element to ensure that the predicate is satisfied before adding the element This works fine until a new method capable of adding an element is added to the superclass in a subsequent release Once this happens, it becomes possible to add an illegal element to an instance of the subclass merely by invoking the new method, which is not overridden in the subclass This is not a purely theoretical problem Several security holes of this nature had to be fixed when Hashtable and Vector were retrofitted to participate in the Collections Framework Both of the above problems stem from overriding methods You might think that it is safe to extend a class if you merely add new methods and refrain from overriding existing methods While this sort of extension is much safer, it is not without risk If the superclass acquires a.

"This book stands above the rest because it has been available on the web and read by thousands of Java programmers The authors have received an enormous amount of feedback about which sections are good and which sections are confusing; the confusing ones have been improved I doubt that any other Java book has undergone such trial by fire" -Metroplex Java User Group, wwwjavamugorg/reviews/ Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a handson guide that lets you quickly become proficient with the Java programming language Written by members of the Java Software team at Sun Microsystems, the book uses an LinkedListException is the parent class of all the possible exceptions thatinteractive approach to can be thrown by the help you learn the Java platform by example linked list class Users of the linked list class can write a single exception handler to handle all linked list exceptions with a atch statement like this: Since its first online release in 1995, the material in The Java(TM) Tutorial has been updated continuously to reflect reader feedback and new releases of the Java platform This third edition has been thoroughly updated to cover { catch (LinkedListException)v13 of the Java Platform, Standard Edition, as well as preceding versions as early as JDK 11 .

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You will find clear explanations of such fundamentals as objects, classes, and data structures In addition, the users could write more specialized handlers for each subclass of Alternatively,book provides introductions to object-oriented programming, applet construction, and user interface design Other opics include exceptions, I/O, and threads To help beginners avoid many LinkedListException common mistakes, an entire chapter is devoted to programming problems and their solutions Convenient summaries at the end of each section are new to this edition Also new for this edition are "Questions and Exercises" sections to help you practice what you learn Choosing a Superclass After working through the lessons in as proven tutorial, you will be well prepared to However, a AnyException subclass can be usedthis the parent class of LinkedListException use the Java programming language in your school or workplace quick perusal of those subclasses shows that they are inappropriate because they are either too specialized or completely unrelated to LinkedListException Therefore, the parent class of LinkedListException should be Exception.

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After carefully designing your class's public API, your reflex should be to make all other members private Only if another class in the same package really needs to access a member should you remove the private modifier, making the member package-private If you find yourself doing this often, you should reexamine the design of your system to see if another decomposition might yield classes that are better decoupled from one another That said, both private and package-private members are part of a class's implementation and do not normally impact its exported API These fields can, however, leak into the exported API if the class implements Serializable (Item 54, Item 55) For members of public classes, a huge increase in accessibility occurs when the access level goes from package-private to protected A protected member is part of the class's exported API and must be supported forever Furthermore, a protected member of an exported class represents a public commitment to an implementation detail (Item 15 The need for protected members should be relatively rare There is one rule that restricts your ability to reduce the accessibility of methods If a method overrides a superclass method, it is not permitted to have a lower access level in the subclass than it does in the superclass [JLS, 8463] This is necessary to ensure that an instance of the subclass is usable anywhere that an instance of the superclass is usable If you violate this rule, the compiler will generate an error message when you try to compile the subclass A special case of this rule is that if a class implements an interface, all of the class methods that are also present in the interface must be declared public This is so because all methods in an interface are implicitly public Public classes should rarely, if ever, have public fields (as opposed to public methods) If a field is nonfinal or is a final reference to a mutable object, you give up the ability to limit the values that may be stored in the field by making it public You also give up the ability to take any action when the field is modified A simple consequence is that classes with public mutable fields are not thread-safe Even if a field is final and does not refer to a mutable object, by making the field public, you give up the flexibility to switch to a new internal data representation in which the field does not exist.

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will be silently ignored by subclasses This is one more case where an implementation detail becomes part f a class's API to permit inheritance By now, it should be apparent that designing a class for inheritance places substantial limitations on the class This is not a decision to be undertaken lightly There are some situations where it is clearly the right thing to do, such as abstract classes, including skeletal implementations of interfaces (Item 16) There are other situations where it is clearly the wrong thing to do, such as immutable classes (Item 13) But what about ordinary concrete classes Traditionally, they are neither final nor designed and documented for subclassing, but this state of affairs is dangerous Each time a change is made in such a class, there is a chance that client classes that extend the class will break This is not just a theoretical problem It is not uncommon to receive subclassing-related bug reports after modifying the internals of a nonfinal concrete class that was not designed and documented for inheritance The best solution to this problem is to prohibit subclassing in classes that are not designed and documented to be safely subclassed There are two ways to prohibit subclassing The easier of the two is to declare the class final The alternative is to make all the constructors private or package-private and to add public static factories in place of the constructors This alternative, which provides the flexibility to use subclasses internally, is discussed in Item 13 Either approach is acceptable This advice may be somewhat controversial, as many programmers have grown accustomed to subclassing ordinary concrete classes to add facilities such as instrumentation, notification, and synchronization or to limit functionality If a class implements some interface that captures its essence, such as Set, List, or Map, then you should feel no compunction about prohibiting subclassing The wrapper class pattern, described in Item 14, provides a superior alternative to inheritance for altering the functionality If a concrete class does not implement a standard interface, then you may inconvenience some programmers by prohibiting inheritance If you feel that you must allow inheritance from such a class, one reasonable approach is to ensure that the class never invokes any of its overridable methods and to document this fact In other words, eliminate the class's self-use of overridable methods entirely In doing so, you'll create a class that is reasonably safe to subclass Overriding a method will never affect the behavior of any other method You can eliminate a class's self-use of overridable methods mechanically, without changing its behavior Move the body of each overridable method to a private helper method and have each overridable method invoke its private helper method Then replace each self-use of an overridable method with a direct invocation of the overridable method's private helper method.

Whenever the ColorList class is notified that the color has changed, it calls the addElement method of the JListData class This method adds the string to theVector and then calls the fireIntervalAdded method This base method of the AbstractListModel class connects to the JList class, telling that class that thedata has changed The JList class then redisplays the data as needed There are also equivalent methods for two other kinds of changes: fireIntervalRemoved and fireContentsChanged These represent the three kinds of changes that can occur in a list box; here, each sends ts own message to the JList display. PDF-417 2d Barcode Printer In VS .NET Using Barcode generation for .Related: Print Interleaved 2 of 5 Word , Code 128 Generation .NET , UPC-E Generator C#

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