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I did have such a test program. However, the results, which did point at what copeg was saying, conflicted with that I had long believed to be true about abstract, that is that I thought I needed at...

An SSCEE? I was asking pretty much how a class could be abstract without any abstract methods or unimplemented interface methods.

Also, another thing, I can sub that class so far and only have...

It implements, I think, all the methods from the interface Border. Yet it's abstract. How is that possible? I thought that in java an abstract class had to have at least one abstract method. I...