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Java Forum / First Aid / July 2005define a new data type
Anyone know how to do something like this C code in Java. #define Point2fT Tuple2fT I have a Tuple2 class which I'd like to define a new data type for as Point2. So I tried making Tuple2 an interface and extending from that, but that seemed like overkill. public class Point2fT extends Tuple2fT ... Is there a better way to do this? >Anyone know how to do something like this C code in Java. > >#define Point2fT Tuple2fT Java doesn't have that. >I have a Tuple2 class which I'd like to define a new data type for as >Point2. So I tried making Tuple2 an interface and extending from that, [quoted text clipped - 3 lines] > >Is there a better way to do this? why? I cannot think of any reason to do that, but there may be... What's your reason? -- now with more cowbell Because I would like a name for my data type that more clearly represents what it is without having to make a new type. A point can be a node, a grid, a vertex, an element ... so a node and a point are the same, yet I would like to use the two names in different areas for the same thing ... how can I do that? > Because I would like a name for my data type that more clearly > represents what it is without having to make a new type. > > A point can be a node, a grid, a vertex, an element ... so a node > and a point are the same, yet I would like to use the two names in > different areas for the same thing ... how can I do that? I've seen this approach quite often in C++, but to be honest, I don't think I've ever seen it used in Java. If you really want to do it, you can extend the point class. But my gut feel is that rather than making your code more readable, it will actually obfuscate the code by creating additional, unnecessary layers. Why not simply name your variables vertexAB or similar?  Signaturemonique Ask smart questions, get good answers: http://www.catb.org/~esr/faqs/smart-questions.html > Because I would like a name for my data type that more clearly > represents what it is without having to make a new type. > > A point can be a node, a grid, a vertex, an element ... so a node and a > point are the same, yet I would like to use the two names in different > areas for the same thing ... how can I do that? I also think this is unnecessary and will lead to hard to read code. Using your examples, a Point does not stop being a point. A node/element may very well have a point, but if it fails to have any other distinguishing characteristics, It is very much just a point. Consider a Class type Node/Element which contains a Point object. A Grid may have zero or more points. I fail to see the 1-1 relationship here. A vertex will indeed _be_ a point, but will be of questionable value outside of its own context. consider: Point highPoint = Mountain.getVertex(); The use of a point here is clear, right? Carl. >Because I would like a name for my data type that more clearly >represents what it is without having to make a new type. > >A point can be a node, a grid, a vertex, an element ... so a node and a >point are the same, yet I would like to use the two names in different >areas for the same thing ... how can I do that? Not really, A node, grid, vertex, etc are made up of Points... But a Point is a Point isn't it? If a grid point is different from vertext point, then just make classes GridPoint and VertexPoint. YMMV though -- now with more cowbell Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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