Posted on November 30, by Scott Alexander [epistemic status:
The default accessibility of a C field or method when no access modifier is specified is private while in Java it is protected except that derived classes from outside the package cannot inherit the field. Reflection The ability to discover the methods and fields in a class as well as invoke methods in a class at runtime, typically called reflection, is a feature of both Java and C.
The primary difference between reflection in Java versus reflection in C is that reflection in C is done at the assembly level while reflection in Java is done at the class level.
Since assemblies are typically stored in DLLs, one needs the DLL containing the targeted class to be available in C while in Java one needs to be able to load the class file for the targeted class.
The examples below which enumerate the methods in a specified class should show the difference between reflection in C and Java. C Code using System; using System.
Unwrap as XmlDocument; if doc! WriteLine "Could not load Assembly: WriteLine "Could not load Type: Sometimes there is a need to obtain the metadata of a specific class encapsulated as an object. This object is the java. Class object in Java and the System. Type object in C. To retrieve this metadata class from an instance of the target class, the getClass method is used in Java while the GetType method is used in C.
Final variables can be set either at compile time or run time. In Java, when the final is used on a primitive it makes the value of the primitive immutable while when used on object references it makes the reference constant meaning that the reference can only point to only one object during its lifetime.
Final members can be left uninitialized when declared but then must be defined in the constructor. To declare constants in C the const keyword is used for compile time constants while the readonly keyword is used for runtime constants.
The semantics of constant primitives and object references in C is the same as in Java. Neither is it possible to create a reference through which it's impossible to modify a mutable object.
The Java language also supports having final parameters to a method. This functionality is non-existent in C. The primary use of final parameters is to allow arguments to a method to be accessible from within inner classes declared in the method body.
Primitive Types For every Java primitive type there is a corresponding C type which has the same name except for byte. The byte type in Java is signed and is thus analagous to the sbyte type in C and not the byte type. C also has unsigned versions of some primitives such as ulong, uint, ushort and byte.
The only significantly different primitive in C is the decimal type, a type which stores decimal numbers without rounding errors at the cost of more space and less speed. Below are different ways to declare real valued numbers in C. Similarly both languages enforce that the call to the base class constructor occurs before any initializations in the derived constructor which prevents the derived constructor from using members that are yet to be initialized.
Both languages also provide a way to call a constructor from another which allows one to reduce the amount of code duplication that can occur in constructors. This practice is typically called constructor chaining. C Code using System; class MyException: This functionality is used extensively in the printf and scanf family of functions.
Both C and Java allow one to define a parameter that indicates that a variable number of arguments are accepted by a method. In Cthe mechanism for specifying that a method accepts a variable number of arguments is by using the params keyword as a qualifier to the last argument to the method which should be an array.
In Java, the same effect is achieved by appending the string " Prior to the existence of the Generics feature set, this capability was achieved by specifying the type of the objects within the data structure as Object then casting to specific types at runtime.Talking about practice: Self-assessment, reflective practice and quality improvement processes Conversation with Michelle Gujer community in critical reflection?
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