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One can essentially augment supplied Java Runtime by supplying your own C or other code implementing a particular functionality in a higher performance mode
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This of course generates machine dependence and should only be used if really needed
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First for classes you wish to implement in native fashion, put in your java code lines like:
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public native mustgofast(arguments); // default functions
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static { System.loadLibrary("faststuffhere"); } // static and in class and so runs only ONCE! and loads the native code
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