Why do I get “non-static variable this cannot be referenced from a static context”?

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Your nested class (which isn’t a subclass, by the way) isn’t marked as being static, therefore it’s an inner class which requires an instance of the encoding class (JavaApp1) in order to construct it.

Options:

  • Make the nested class static
  • Make it not an inner class (i.e. not within JavaApp1 at all)

  • Create an instance of JavaApp1 as the “enclosing instance”:

    GenTest x = new JavaApp1().new GenTest();

Personally I’d go with the second approach – nested classes in Java have a few oddities around them, so I’d use top-level classes unless you have a good reason to make it nested. (The final option is particularly messy, IMO.)

See section 8.1.3 of the JLS for more information about inner classes.

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