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| specification > class > abstract class > Number class | 
| Number class comparison table | |||||
| Subject | is an instance of | is a subtopic of | is a kind of | have | has definition | 
|---|---|---|---|---|---|
| abstract class | Classes | class | instances | A class that can only be subclassed - it cannot be instantiated or the compiler will display an error message and refuse to compile the program | |
| Number class | abstract class | Example Classes | specification | 
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