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convenience method, the automatically generated serial version UID changes If you fail to declare an explicit serial version UID, compatibility will be broken A second cost of implementing Serializable is that it increases the likelihood of bugs and security holes Normally, objects are created using constructors; serialization is an extralinguistic mechanism for creating objects Whether you accept the default behavior or override it, deserialization is a hidden constructor with all of the same issues as other constructors Because there is no explicit constructor, it is easy to forget that you must ensure that deserialization guarantees all of the invariants established by real constructors and that it does not allow an attacker to gain access to the internals of the object under construction Relying on the default deserialization mechanism can easily leave objects open to invariant corruption and illegal access (Item 56) A third cost of implementing Serializable is that it increases the testing burden associated with releasing a new version of a class When a serializable class is revised, it is important to check that it is possible to serialize an instance in the new release, and deserialize it in old releases, and vice versa The amount of testing required is thus proportional to the product of the number of serializable classes and the number of releases, which can be large These tests cannot be constructed automatically because, in addition to binary compatibility, you must test for semantic compatibility In other words, you must ensure both that the serialization-deserialization process succeeds and that it results in a faithful replica of the original object The greater the change to a serializable class, the greater the need for testing The need is reduced if a custom serialized form is carefully designed when the class is first written (Item 55), but it does not vanish entirely Implementing the Serializable interface is not a decision to be undertaken lightly It offers real benefits: It is essential if a class is to participate in some framework that relies on serialization for object transmission or persistence Furthermore, it greatly eases the use of a class as a component in another lass that must implement Serializable There are, however, many real costs associated with implementing Serializable Each time you implement a class, weigh the costs against the benefits As a rule of thumb, value classes such as Date and BigInteger should implement Serializable, as should most collection classes Classes representing active entities, such as thread pools, should rarely implement Serializable As of release 14, there is an XML-based JavaBeans persistence mechanism, so it is no longer necessary for Beans to implement Serializable Classes designed for inheritance (Item 15) should rarely implement Serializable, and interfaces should rarely extend it Violating this rule places a significant burden on anyone who extends the class or implements the interface There are times when it is appropriate to violate the rule For example, if a class or interface exists primarily to participate in some framework that requires all participants to implement Serializable, then it makes perfect sense for the class or interface to implement or extend Serializable There is one caveat regarding the decision not to implement Serializable If a class that is designed for inheritance is not serializable, it may be impossible to write a serializable subclass Specifically, it will be impossible if the superclass does not provide an accessible parameterless constructor Therefore you should consider providing a parameterless constructor on nonserializable classes designed for inheritance Often this requires no effort because many classes designed for inheritance have no state, but this is not always the case.

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Memory leaks are another class of fault that can cripple an application When a data item is dynamically allocated, it can only be found if there s at least one pointer to it in the process s address space Reassign a new value to the last pointer, and the data item is orphaned left in the address space without any way of being reclaimed or returned to the pool of available memory cells If this orphaning process happens regularly, the process has a memory leak and will grow to consume all available resources on the machine Memory access faults don t always cause application termination If the problem results in a pointer being moved to another valid location in a valid page, then you ll corrupt data and possibly get the wrong answer, but you won t suffer an application crash.

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With the new constructor and the new accessors in place, Period is truly immutable No matter how malicious or incompetent a programmer, there is simply no way he can violate the invariant that the start of a period does not follow its end This is true because there is no way for any class other than Period itself to gain access to either of the mutable fields in a Period instance These fields are truly encapsulated within the object Note that the new accessors, unlike the new constructor, do use the clone method to make defensive copies This is acceptable (although not required), as we know with certainty that the class of Period's internal Date objects is javautilDate rather than some potentially untrusted subclass Defensive copying of parameters is not just for immutable classes Anytime you write a method or constructor that enters a client-provided object into an internal data structure, think about whether the client-provided object is potentially mutable If it is, think about whether your class could tolerate a change in the object after it was entered into the data structure If the answer is no, you must defensively copy the object and enter the copy into the data structure in place of the original For example, if you are considering using a client-provided object reference as an element in an internal Set instance or as a key in an internal Map instance, you should be aware that the invariants of the set or map would be destroyed if the object were modified after it were inserted The same is true for defensive copying of internal components prior to returning them to clients Whether or not your class is immutable, you should think twice before returning a reference to an internal component that is utable Chances are you should be returning a defensive copy Also, it is critical to remember that nonzero-length arrays are always mutable Therefore you should always make a defensive copy of an internal array before returning it to a client Alternatively, you could return an immutable view of the array to the user Both of these techniques are shown in Item 12 Arguably, the real lesson in all of this is that you should, where possible, use immutable objects as components of your objects so that you that don't have to worry about defensive copying (Item 13) In the case of our Period example, it is worth pointing out that experienced programmers often use the primitive long returned by DategetTime() as an internal time representation rather than using a Date object reference They do this primarily because Date is mutable It is not always appropriate to make a defensive copy of a mutable parameter before integrating it into an object There are some methods and constructors whose invocation indicates an explicit handoff of the object referenced by a parameter When invoking such a method, the client promises that it will no longer modify the object directly A method or constructor that expects to take control of a client-provided mutable object must make this clear in its documentation.

More common are wild pointer references that cause the text segment the executable instructions of a process to be damaged, or that damage the dynamic linking information so that a future library call goes into hyperspace When an application scribbles into memory that contains instructions, the next attempt to execute those instructions causes either random results or a fault in which the operating system realizes it s trying to execute an illegal instruction a random value written into memory as opposed to instructions generated by a legitimate compiler Applications that crash with illegal instruction errors or data alignment errors generally suffer from wild (uninitialized) pointer problems In nearly every case, there s some element of data corruption, making it a chore to determine what s valid and where to pick up from a well-known stateRelated: Create Interleaved 2 of 5 NET , Print EAN-8 NET , NET UPC-E Generator.

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new method in a subsequent release and you have the bad luck to have given the subclass a method with the same signature and a different return type, your subclass will no longer compile [JLS, 8463] If you've given the subclass a method with exactly the same signature as the new superclass method, then you're now overriding it, so you're subject to the two problems described above Furthermore, it is doubtful that your method will fulfill the contract of the new superclass method, as that contract had not yet been written when you wrote the subclass method Luckily, there is a way to avoid all of the problems described earlier Instead of extending an existing class, give your new class a private field that references an instance of the existing class This design is called composition because the existing class becomes a component of the new ne Each instance method in the new class invokes the corresponding method on the contained instance of the existing class and returns the results This is known as forwarding, and the methods in the new class are known as forwarding methods The resulting class will be rock solid, with no dependencies on the implementation details of the existing class Even adding new methods to the existing class will have no impact on the new class To make this concrete, here's a replacement for InstrumentedHashSet that uses the composition/forwarding approach:. Effective Java: Programming Language Guide public public public ublic } Object[] toArray(Object[] a) { return stoArray(a); boolean equals(Object o) { return sequals(o); int hashCode() { return shashCode(); String toString() { return stoString(); } } } }. QR Code 2d Barcode Generator In C#.NET Using .Related: 

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