Java equivalent to #region in C#

Code-folding regions

IntelliJ IDEA by JetBrains has this feature.

Either type comments yourself, or use hotkey for "surround with":

• Windows OS: Ctrl + Alt + T
• macOS: Command ⌘ + Option ⌥ + T

Regions look like the following.

public class Person
{
    //region Fields
    private String firstName;
    private String lastName;
    //endregion

    //region Constructors
    public Person ( final String firstName , final String lastName )
    {
        this.firstName = firstName;
        this.lastName = lastName;
    }
    //endregion

    //region Accessors
    public String getFirstName ( ) { return firstName; }

    public String getLastName ( ) { return lastName; }
    //endregion
}

Notice:

• No SPACE character after slashes.
• Optional group name follows, as seen here with Fields, Constructors, and Accessors.

Arrows appear in the code-editor’s gutter. Click to collapse/expand each region.

Conveniently, your groups appear in the File Structure tool.

See article, company blog post, and documentation.

On a related note, IntelliJ can draw a line above each method.

With Android Studio, try this:

//region VARIABLES
private String _sMyVar1;
private String _sMyVar2;
//endregion

Careful : no blank line after //region ...

And you will get:

No equivalent in the language... Based on IDEs...

For example in netbeans:

NetBeans/Creator supports this syntax:

// <editor-fold defaultstate="collapsed" desc="Your Fold Comment">
...
// </editor-fold>

http://forums.java.net/jive/thread.jspa?threadID=1311

Custom code folding feature can be added to eclipse using CoffeeScript code folding plugin.

This is tested to work with eclipse Luna and Juno. Here are the steps

1. Download the plugin from here

2. Extract the contents of archive

3. Copy paste the contents of plugin and features folder to the same named folder inside eclipse installation directory
4. Restart the eclipse

5. Navigate Window >Preferences >Java >Editor >Folding >Select folding to use: Coffee Bytes Java >General tab >Tick checkboxes in front of User Defined Fold

   

6. Create new region as shown:

   

7. Restart the Eclipse.

8. Try out if folding works with comments prefixed with specified starting and ending identifiers

   

   

You can download archive and find steps at this Blog also.

For Eclipse IDE the Coffee-Bytes plugin can do it, download link is here.

EDIT:

Latest information about Coffee-Bytes is here.

This is more of an IDE feature than a language feature. Netbeans allows you to define your own folding definitions using the following definition:

// <editor-fold defaultstate="collapsed" desc="user-description">
  ...any code...
// </editor-fold>

As noted in the article, this may be supported by other editors too, but there are no guarantees.

the fastest way in Android Studio (or IntelliJ IDEA)

1. highlight the code you want to surround it
2. press ctrl + alt + t
3. press c ==> then enter the description
4. enjoy

AndroidStudio region
Create region

First, find (and define short cut if need) for Surround With menu

Then, select the code, press Ctrl+Alt+Semicolon -> choose region..endregion...

Go to region

First, find Custom Folding short cut
Second, from anywhere in your code, press Ctrl+Alt+Period('>' on keyboard)

Contrary to what most are posting, this is NOT an IDE thing. It is a language thing. The #region is a C# statement.

I were coming from C# to java and had the same problem and the best and exact alternative for region is something like below (working in Android Studio, dont know about intelliJ):

 //region [Description]
 int a;
 int b;
 int c;
//endregion

the shortcut is like below:

1- select the code

2- press ctrl + alt + t

3- press c and write your description

The best way

//region DESCRIPTION_REGION
int x = 22;
// Comments
String s = "SomeString";
//endregion;

Tip: Put ";" at the end of the "endregion"

If anyone is interested, in Eclipse you can collapse all your methods etc in one go, just right click when you'd normally insert a break point, click 'Folding' > 'Collapse all'. It know it's not an answer to the question, but just providing an alternative to quick code folding.

here is an example:

//region regionName
//code
//endregion

100% works in Android studio

#region

// code

#endregion

Really only gets you any benefit in the IDE. With Java, there's no set standard in IDE, so there's really no standard parallel to #region.

vscode

I use vscode for java and it works pretty much the same as visual studio except you use comments:

//#region name

//code

//#endregion

I usually need this for commented code so I use curly brackets at start and end of that.

{
// Code
// Code
// Code
// Code
}

It could be used for code snippets but can create problems in some code because it changes the scope of variable.

Meet custom folding regions ⌥⌘T

In Visual Studio Code, try this:

//region Variables
// Code you need
//endregion

Actually johann, the # indicates that it's a preprocessor directive, which basically means it tells the IDE what to do.

In the case of using #region and #endregion in your code, it makes NO difference in the final code whether it's there or not. Can you really call it a language element if using it changes nothing?

Apart from that, java doesn't have preprocessor directives, which means the option of code folding is defined on a per-ide basis, in netbeans for example with a //< code-fold> statement

On Mac and Android Studio follow this sequence:

1. Highlight the source code to fold
2. Press Alt+Command+t
3. Select <editor-fold>

Also you can select other options:

In Eclipse you can collapse the brackets wrapping variable region block. The closest is to do something like this:

public class counter_class 
{ 

    { // Region

        int variable = 0;

    }
}