![]() ![]() The Compute object knows only that each object it receives implements the execute method. Is brought in when needed, the code that generates the random prime number would be brought in when needed. In just the way that the algorithm for computing This code could also be downloaded when the Task object is passed to a Compute object. ![]() That task would also be computationally intensive and therefore a good candidate for passing to the ComputeEngine, but it would require very different code. You could also implement a task that, for example, generates a random prime number by using a probabilistic algorithm. The fact that the supplied Task object computes the value of Pi is irrelevant to the ComputeEngine object. The result, which in the case of the Pi task is a BigDecimal object, is handed back to the calling client, where it is used to print the result of the computation. At that point, the code for the class is loaded by RMI into the Compute object's Java virtual machine, the execute method is invoked, and the task's code is executed. The most interesting feature of this example is that the Compute implementation object never needs the Pi class's definition until a Pi object is passed in as an argument to the executeTask method. ![]() The serialver tool can be run against the previous version to determine the default computed value for it. If a previous version of the class has been released without an explicit serialVersionUID declaration, but serialization compatibility with that version is important, then the default implicitly computed value for the previous version must be used for the value of the new version's explicit declaration. ![]() If no previous version of the class has been released, then the value of this field can be any long value, similar to the 227L used by Pi, as long as the value is used consistently in future versions. Note that all serializable classes, whether they implement the Serializable interface directly or indirectly, must declare a private static final field named serialVersionUID to guarantee serialization compatibility between versions. If (System.getSecurityManager() = null) while (pareTo(BigDecimal.ZERO) != 0) ![]()
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