The replacement class the class which is actually serialized is shown in Example 37 in Java

Drawer Code 3/9 in Java The replacement class the class which is actually serialized is shown in Example 37
The replacement class the class which is actually serialized is shown in Example 37
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Example 37 Replacement class class Replacement implements Serializable { // State, SUID, constructors not shown // readResolve must yield an object type-compatible with the // replaced object Object readResolve() { return new Replaced(this); } }
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The writeReplace method is also useful as an opportunity to adjust the values of member fields prior to serialization Suppose that for some reason you wanted to adjust the values of your member fields before they are serialized However, when writeObject is called, the serialization system has already decided which fields will be serialized by defaultWriteObject, and their values, so it is too late to modify their values in the writeObject method However, it is not too late to do so in the writeReplace method A class which rewrites itself prior to serialization is shown in Example 38 If you use this technique, obviously the writeReplace method should return this
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Example 38 Class which rewrites itself prior to serialization class Rewriter implements Serializable { // State, SUID, constructors not shown Object writeReplace() { // Last chance to adjust member fields before serialization return this; } }
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3122 The serialPersistentFields member A class may provide a private data member named serialPersistentFields, of type ObjectStreamField[], to modify the behaviour of default serialization The serialPersistentFields member specifies a list of the serializable fields of the class: if present, this list completely overrides the default list obtained from the class definition The default list of serializable fields is obtained by "introspection" on the class definition, ie by calling the ClassgetDeclaredFields method, and ignoring static and transient fields The serialPersistentFields mechanism removes the default limitation that serializable fields of a class must be member fields in the current definition of that class, and allows fields to be added to, or removed from, a class without necessarily affecting its serialization For further details of these and other advanced serialization facilities see the Serialization specification supplied with the JDK (all versions)
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313 javadoc and serialization
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The javadoc utility supports tags to document the serialization properties of a class:
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the @serial tag indicates fields which are serialized by default the @serialData tag indicates optional data written by the writeObject method of a Serializable object, or data written by an ExternalizablewriteExternal method the @serialField tag indicates an ObjectStreamField member of a serialPersistentFields array
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314 Improving the performance of Serialization
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See 18643
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315 Exercises
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1:Modify the client for the Echo server of previous exercises to call the RemoteEchoecho method with the following: (a) null; (b) new String("helloooo"); (c) new Date(); and (d) new Object() The client should catch and display all exceptions Test the entire remote echo system by running the server and client, and show the output What happened in case (d), and why Why didn't this happen in the other cases 2:Repeat the previous exercise, passing an instance of the DataContainer class below as the parameter, in which the member data takes on the values (a), (b), (c), and (d) of the previous exercise Test the entire remote echo system by running the server and client, and show the output Describe and explain the results
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class DataContainer implements Serializable { Object data = null; }
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3:Show the in degree and out degree of every object in the object graphs pictured in this chapter 4:Can an object graph contain an object whose in degree and out degree are both zero 5:Can an object graph consist of a single object whose in degree and out degree are both 1 2 N
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4 Remote interfaces
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Introduction Proxies Dispatchers Exercises
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41 In this chapter
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Since clients communicate with servers via a remote interface, you will need to know the rules for defining this interface before you begin working with RMI servers This chapter describes remote interfaces and provides an introduction to remote stubs and skeletons
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