Is there a Java equivalent or methodology for the typedef keyword in C++?

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Coming from a C and C++ background, I found judicious use of typedef to be incredibly helpful. Do you know of a way to achieve similar functionality in Java, whether that be a Java mechanism, pattern, or some other effective way you have used?

Java has primitive types, objects and arrays and that's it. No typedefs.

What is an alternate to typedef in Java?, Coming from a C and C++ background, I found judicious use of **`typedef`** to be incredibly helpful. Do you know of a way to achieve similar  the most common use of the typedef is to declare a structure and a pointer to it's type in one block. Since there a no pointers in java, it is useless. Java is strongly object oriented, and as such, the question is asking if there. is a way to rename an object of one type to another.

If this is what you mean, you can simply extend the class you would like to typedef, e.g.:

public class MyMap extends HashMap<String, String> {}

typedef in C Language | C Language Tutorial, Coming from a C and C++ background, I found judicious use of typedef to be incredibly helpful. Do you know of a way to achieve similar functionality in Java,  In one line, There is nothing in Java which is equivalent to typedef of C++. In Java, class is used to name and construct types or we can say that class is the combined function of C++’s struct and typedef. But that is totally different thing and not the equivalent of typedef anywhere. typedef: It is a keyword not a function that is

There is no typedef in java as of 1.6, what you can do is make a wrapper class for what you want since you can't subclass final classes (Integer, Double, etc)

What is/are the alternative(s) of #define in java?, The C struct and typedef constructs were omitted from the Java programming Degenerate classes consisting solely of data fields are nearly equivalent to C structs in The area function takes a pointer to a shape_t struct and returns its area, More generally, you can augment a typesafe enum class with any method that  Java doesn't have extension methods, so a C# extension method is just converted to an ordinary Java static method (calls to the method have to be adjusted to static calls using the class name).

As others have mentioned before, There is no typedef mechanism in Java. I also do not support "fake classes" in general, but there should not be a general strict rule of thumb here: If your code for example uses over and over and over a "generic based type" for example:

Map<String, List<Integer>> 

You should definitely consider having a subclass for that purpose. Another approach one can consider, is for example to have in your code a deceleration like:

//@Alias Map<String, List<Integer>>  NameToNumbers;

And then use in your code NameToNumbers and have a pre compiler task (ANT/Gradle/Maven) to process and generate relevant java code. I know that to some of the readers of this answer this might sound strange, but this is how many frameworks implemented "annotations" prior to JDK 5, this is what project lombok is doing and other frameworks.

Does Java support structs?, language to assign alternative names to existing datatypes. Its mostly used with user defined datatypes, when names of the datatypes become slightly complicated to use in programs. No there is no auto variable type in Java. The same loop can be achieved as: for ( Object var : object_array) System.out.println(var); Java has local variables, whose scope is within the block where they have been defined. Similar to C and C++, but there is no auto or register keyword.

Really, the only use of typedef that carries over to Javaland is aliasing- that is, giving the same class multiple names. That is, you've got a class "A" and you want "B" to refer to the same thing. In C++, you'd be doing "typedef B A;"

Unfortunately, they just don't support it. However, if you control all the types involved you CAN pull a nasty hack at the library level- you either extend B from A or have B implement A.

(One could say that class has the combined function of C's struct and typedef.) If your Are there any downsides to using the "short" primitive type in Java applications? How does the method Java return char and call it? The reason C# has the var keyword is because it's possible to have Types that have no name in .NET. Eg: var myData = new { a = 1, b = "2" }; In this case, it would be impossible to give a proper type to myData. 6 years ago, this was impossible in Java (all Types had names, even if they were extremely verbose and unweildy). I do not know if this

Garbage collection The Java Virtual Machine performs garbage collection so that to keep all their variable declarations grouped together at the top of a method, however. No typedef Java doesn't support the typedef keyword used in C to define You cannot do this with Java methods, but you can often achieve similar​  The C programming language provides a keyword called typedef, which you can use to give a type a new name. Following is an example to define a term BYTE for one-byte numbers − typedef unsigned char BYTE; After this type definition, the identifier BYTE can be used as an abbreviation for the type unsigned char, for example.. BYTE b1, b2;

The Java complier is smarter than the C complier, in that it allows methods to be No typedef: Java does not support the typedef keyword used in C to define You cannot do this with Java methods, but u can often achieve similar results by  List of all Keywords in C Language. There are three types of loops in C programming. typedef. The typedef keyword is used to explicitly associate a type with

Equivalents were produced with C++ to Java Converter and Java to C++ Converter. Free Edition. Abstract (Java) or Pure Virtual (C++) Methods Function Pointers (C++) and Functional Interfaces (Java). C++ function pointer typedefs correspond to Java functional interfaces. Here's an Object (Java) and std::any (​C++17). In Java, all methods are by default virtual and you can override them. In C#, all methods are non-virtual. To override a method in the parent class, make sure the method of the parent class is defined as virtual using the virtual keyword.

Comments
  • typedef can be used or many things, good and bad, though not everyone agrees on which is which. Would you mind saying which aspects of typedef you think are valuable? That way we can either tell you how to get similar effects in Java or why it's something you don't want to do in Java. The collection of answers below each assumes you are talking about the author's favorite (or most-hated) use.
  • I like to typedef native types if I might later turn it into a class. typedef IndexT int; for example. Later, if I want IndexT to be a class, I just implement it and remove the typedef. It helps with information hiding.
  • @Alexander - updated link: ibm.com/developerworks/java/library/j-jtp02216/index.html
  • I'm not sure what the downsides of this are, but: public interface ScopeFactory { <Scope extends Map<String, Object>> Scope create(...) throws Exception; }
  • You might like Scala stackoverflow.com/a/21223102/203968
  • I guess most of people want typedef to redefine boolean to bool.
  • @TomášZato I don't know most people, but in my experience, it's useful for adding semantics like: typedef int PlayerID which enables the compiler to make sure PlayerIDs aren't being used interchangeably with other ints, and it also makes code much more readable for humans. Basically, it's like an enum but without a limited set of values.
  • @TomášZato It's also usefull to shorten long types such as typedef MegaLongTemplateClass<With, Many, Params> IsShorten;.
  • @weberc2 "which enables the compiler to make sure PlayerIDs aren't being used interchangeably with other ints" – typedef doesn't enable any such thing. It just gives another name for a type.
  • Also useful if, for instance, you have some ID of type int and you need to change it to long, you have to change it in every place in code where you work with the ID. If you had typedef, you'd only have to change it in 1 place.
  • I'd argue whether this is any more anti-pattern than using typedef in C.