What is the equivalent of the C# 'var' keyword in Java?

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One use of the var keyword in C# is implicit type declaration. What is the Java equivalent syntax for var?

C# equivalent of VB's With keyword, VB has a With keyword that you can use to save typing same variables name over and over again. Here's a similar workaround for C#. expr is an instance of a type that implements the type interface. Beginning with C# 7.1, expr may have a compile-time type defined by a generic type parameter and its constraints. If expr is true and is is used with an if statement, varname is assigned within the if statement only.

If you add Lombok to your project you can use its val keyword.


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JEP - JDK Enhancement-Proposal


JEP 286: Local-Variable Type Inference

Author Brian Goetz

// Goals:
var list = new ArrayList<String>();  // infers ArrayList<String>
var stream = list.stream();          // infers Stream<String>

VB.NET and C# Equivalents, Convert methods if the appropriate method exists, otherwise they are converted to the standard C# casting operator. The C# equivalent to VB's 'DirectCast' is the​  Although C# doesn't have any direct equivalent for the general case, C# 3 gain object initializer syntax for constructor calls: var foo = new Foo { Property1 = value1, Property2 = value2, etc }; See chapter 8 of C# in Depth for more details - you can download it for free from Manning's web site.

I have cooked up a plugin for IntelliJ that – in a way – gives you var in Java. It's a hack, so the usual disclaimers apply, but if you use IntelliJ for your Java development and want to try it out, it's at https://bitbucket.org/balpha/varsity.

What are the equivalents of Me and MyBase?, Me in C# is this , and MyBase in C# is base . To access normal members, just use this.memberName or base.memberName . For information  After typing a function in C#, go back just right before its declaration, and type three slashes in a row. The IDE will then automatically parse the function prototype and generate a block of comments like this: It is your job to fill the summary

Equality operators, Reference types equality. By default, two reference-type operands are equal if they refer to the same object: C# i could be wrong but i think vb.net's "with" is a compiler feature (the msil is probably same if you use "with" or not), while this version, in c#, probably produces more and slower msil (delegate, lamda, anonymous method, etc)

What is C# equivalent of the vb.net isNothing function, C# null - equivalent in VB.Net IsNothing Function returns a Boolean value indicating whether an expression has no object assigned to it. Testing if an Object is  Hello, What is the equivalent of C# return statement in powerapps. I would hate to think that i will need to use a giant If block with a bunch of nested If statements.

Java and C# data type equivalents, Table 1. Data type equivalents between Java and C#. Java type, C# type. boolean, bool. java.lang.Boolean, bool? byte, sbyte or byte. java.lang.Byte, sbyte​? C# Equivalent to VB Modules The closest equivalent to a VB module is a static class in C#. One difference is that VB allows you to specify module members from elsewhere in a project without qualifying the member call with the module name (Instant C# inserts these qualifiers into the converted C# code).

What is the C# equivalent of JEE? : java, NET technology stack so I'm going to either get the hell out of here, or adapt and learn. When we're talking about C#, what is the equivalent of JEE? What's C#  C#: Methods are always declared inside a class or struct. C#: All enumerations are instances of System.Enum class that provides several helper methods for enumerations. C#: A protocol is used to define a set of related functions that another type can implement. C#: C# supports type casting and uses is for type checking.

  • val (or var) if you use a particular "Java replacement" language ;-)
  • @pst: that would be Scala? Hm yes, it is.
  • For IntelliJ, I submitted this as a feature request: youtrack.jetbrains.com/issue/IDEA-102808 The IDE could collapse code to show val or var even though the underlying code wouldn't have it.
  • @Jon I've hacked something together for IntelliJ, see my answer.
  • There is now a proposal for this feature to be included in Java - openjdk.java.net/jeps/286
  • @Mike Caron: C# has [default] non-virtual calls and operators are not virtual so... var p = new X(); p.Z() is not the same as SuperX p = new X(); p.Z() for all X and and SuperX, even though X : SuperX. With var the static type of p is always X in first example above, but always SuperX in the second example. A subtle but important difference to be aware of. But your answer is very correct :-)
  • @Jon Hanna: var does not make the code less clear. Rather the opposite in my opinion. Why for example write the type two (or even three) times on the same row when you declare and instantiate it (RadioButton radioButton = new RadioButton();)? var makes you rather think twice when you are naming your variables because it turns the focus on the functionality rather than the type (for example UserCollection collection = new userRepository.GetUsers(); rather more naturally turns into var users = userRepository.GetUsers();). If you think var is unclear it is just because unused to it.
  • @MartinOdhelius var very definitely can make code clear used well, but it can also make it unclear too used badly; like many formatting options. The balance differs depending on how much you use anonymous objects and generics, neither of which existed in .NET 1.0, making it less useful as a hypothetical keyword in the first version of C♯. I would only name a RadioButton radioButton in the case of a factory or helper method where the only thing significant about the button was that it was a RadioButton, otherwise that's madness with or without var.
  • @Jon Hanna: I was once as critical to var as you, if not more, but I have changed my opinion, and perhaps it is as simple as an question of different opinions, because I still think you are wrong when you say it is a matter how much you are using anonymous objects and generics ;) The type declaration is most often just code noise, if you can not understand the code without it the code is probably unclear in either case.
  • You're confusing var with anonymous types. var itself simply asks the compiler to infer the type from the assignment; it's syntactic sugar. I was skeptical of it at first, but I use it religiously and have yet to encounter a time where it caused confusion. It removes redundancy when instantiating and removes the need to check the type when referencing. There is no JAVA equivalent as of JAVA 9.
  • @rightfold: Objects whose reference is final are not necessarily immutable. Consider final StringBuilder strB = new StringBuilder("My reference is final"); strB.append("I'm not immutable");
  • Since lombok v1.16.12 there is also experimental support for var. projectlombok.org/features/experimental/var.html