///Initializes all the counters for the evaluation and also takes a///cost matrix as parameter.///UseuseNoPriors()if the dataset is the test set and you///can't initialize with the priors from the training set via///setPriors(Instances).//////set of training instances, to get some...
Here is a typical example: public enum Size { SMALL, MEDIUM, LARGE, EXTRA_LARGE }; The type defined by this declaration is actually a class. The class has exactly four instances—it is not possible to construct new objects. Therefore, you never need to use equals for values of enumerated...
The only time to seriously consider using private attributes is when you’re worried about naming conflicts with subclasses. This problem occurs when a child class unwittingly defines an attribute that was already defined by its parent class:
Now look at the variabletextinside the lambda expression. Note that this variable isnotdefined in the lambda expression. Instead, it is a parameter variable of therepeatMessagemethod. If you think about it, something nonobvious is going on here. The code of the lambda expression may run long...
When your object is returned, individual type information is not included. Instead, as shown in Figure 10.3, the objects are typed to their variable names. In this example, the return type is Person and contains types Name and ID. Figure 10.3 Returning an object of type Person. Returning an...
It is possible, for example, to declare a readonly System.Guid instance field:public static readonly Guid ComIUnknownGuid = new Guid("00000000-0000-0000-C000-000000000046");The same, however, is not possible using a constant because of the fact that there is no C# literal representation of...
If scope defines the visibility of a name and scopes are allowed to overlap, any name defined in an outer scope is visible to an inner scope, but not the other way around. In the code shown in Listing 3.1, the fieldageis in scope throughout the entire body ofContact, including within...
The pointer is 4 bytes in size. So sizeof(myCar) returns 4. The object consists of two 4-byte pointers, one integer, plus one additional field that does not derive from the Car class.That extra field is from the NSObject class. Notice NSObject at the right of the colon next to ...
Otherwise, it is a good idea to leave the throws specifier in place. That gives subclasses the option of throwing a CloneNotSupportedException if they can’t support cloning.You have to be careful about cloning of subclasses. For example, once you have defined the clone method for the ...
The names of proxy classes are not defined. The Proxy class in the Java 2 SDK generates class names that begin with the string $Proxy. There is only one proxy class for a particular class loader and ordered set of interfaces. That is, if you call the newProxyInstance method twice with...