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I just set up JDK 7 on my PC running Windows 7 and created a hello world program called HelloWorldApp.java.
When I tried to run it, it said that it couldn’t find the file. I looked in the directory and found the .class file, but it was named HelloWoldApp.class (note the missing r).
Why is this, and should I be concerned?
Check your source file. I bet you named the class
HelloWoldAppinside.