It takes a little longer to type out such names, but typing is not the reason programming can be hard. It also makes your programs easier to read and understand if everything is spelled out and you have chosen meaningful names. It is too easy to forget how you abbreviated it and then you spend a lot of time trying to keep consistent spelling. It is also a good idea not to abbreviate anything in a program. Method names are generally not capitalized, but have subsequent words capitalized: pickBeeper, for example. If the name is a composed word like MileWalker, then subsequent words are also capitalized, such as the W in MileWalker. Class names are usually written beginning with an initial uppercase letter. You should also say which package the file belongs to with a package statement.įinally note that in Java we normally avoid use of the underscore character in names. The above belongs in a file named MileWalker.java. In Java you are encouraged to put one class in each file and normally to make the class public. You can do this only if you put it in its own file, however. In fact, it is a good idea to mark the class itself public. In particular, if you give new versions for the built in commands like move or pickBeeper, you MUST mark them as public, since the versions define in ur_Robot are marked public. In general you should probably do the same with all your methods when writing in real Java. Note that we have also marked the moveMile method public here. The meaning of super, by the way, is that the MileWalker when created must also execute the instructions defined for creating an ur_Robot, since the MileWalker inherits from ur_Robot. The rest is the same in every class you write. The constructor always has the same name as the class and is normally public. It has the same name as the class in which it resides and is. Package kareltherobot public class MileWalker extends ur_Robot Java Constructor Tutorial - A constructor initializes an object immediately upon creation. Fortunately the form of these is always the same here. New classes that you write need to have a constructor.
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