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Okay since .class files use the JRE to run, this theoretically makes them platform-independent. Since, the class file contains the byte-code to that the JRE uses to run it, it should run whether that JRE resides on a Windows machine, a Linux box, or on a Mac. I wrote a Java program and the class file executes perfectly on my Windows laptop, but will not work on my Mac. When I try to run it in OS X I get the following error:

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Exception in thread "main" java.lang.NoClassDefFoundError: CalMortCalc$Interact at CalMortCalc.( at CalMortCalc.main( Caused by: java.lang.ClassNotFoundException: CalMortCalc$Interact at$ at Method) at at java.lang.ClassLoader.loadClass( at sun.misc.Launcher$AppClassLoader.loadClass( at java.lang.ClassLoader.loadClass( ... 2 more
no dude the .class file is common to all the platforms there might be any warning in your code please note it.
Where is CalMortCalc$Interact.class located when you run it on OSX? Do you need to adjust/declare a CLASSPATH variable?

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I figured it out. I had forgotten that I had created and implemented a class called interact within the program. At compile time java automatically creates that class file (CalMortCalc$Interact). Both of those files must be present for the program to execute, but I only copied the CalMortCalc.class, not both. I brought over CalMortCalc$Interact.class and the program works fine. Sometimes it is the simplest things that leave you puzzled. Turns out all I really needed was a little sleep. lol

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