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Checks for illegal instantiations where a factory method is preferred. Depending on the project, for some classes it might be preferable to create instances through factory methods rather than calling the constructor. A simple example is the <code>java.lang.Boolean</code> class. In order to save memory and CPU cycles, it is preferable to use the predefined constants TRUE and FALSE. Constructor invocations should be replaced by calls to <code>Boolean.valueOf()</code>. Some extremely performance sensitive projects may require the use of factory methods for other classes as well, to enforce the usage of number caches or object pools.
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