Java equivalent to region in C

Question

I want to use regions for code folding in Eclipse  how can that be done in Java   An example usage in C     region name   code  endregion

User · Answer

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.

User · Answer

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

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There is some option to achieve the same  Follow the below points   1  Open Macro explorer   2  Create new macro   3  Name it  OutlineRegions   Or whatever you want   4  Right Click on the  OutlineRegions   Showing on Macro Explorer  select the  Edit  option and paste the following VB code into it       Imports System Imports EnvDTE Imports EnvDTE80 Imports EnvDTE90 Imports EnvDTE90a Imports EnvDTE100 Imports System Diagnostics Imports System Collections  Public Module OutlineRegions      Sub OutlineRegions           Dim selection As EnvDTE TextSelection   DTE ActiveDocument Selection          Const REGION START As String       region          Const REGION END As String       endregion           selection SelectAll           Dim text As String   selection Text         selection StartOfDocument True           Dim startIndex As Integer         Dim endIndex As Integer         Dim lastIndex As Integer   0         Dim startRegions As Stack   New Stack            Do             startIndex   text IndexOf REGION START  lastIndex              endIndex   text IndexOf REGION END  lastIndex               If startIndex   -1 AndAlso endIndex   -1 Then                 Exit Do             End If              If startIndex  lt  gt  -1 AndAlso startIndex  lt  endIndex Then                 startRegions Push startIndex                  lastIndex   startIndex   1             Else                   Outline region                     selection MoveToLineAndOffset CalcLineNumber text  CInt startRegions Pop      1                  selection MoveToLineAndOffset CalcLineNumber text  endIndex    1  1  True                  selection OutlineSection                    lastIndex   endIndex   1             End If         Loop          selection StartOfDocument       End Sub      Private Function CalcLineNumber ByVal text As String  ByVal index As Integer          Dim lineNumber As Integer   1         Dim i As Integer   0          While i  lt  index             If text Chars i    vbCr Then                 lineNumber    1                 i    1             End If              i    1         End While          Return lineNumber     End Function End Module   5  Save the macro and close the editor   6  Now let s assign shortcut to the macro  Go to Tools- Options- Environment- Keyboard and search for your macro in  show commands containing  textbox  Type  Macro into the text box  it will suggest the macros name  choose yours one    7  now in textbox under the  Press shortcut keys  you can enter the desired shortcut  I use Ctrl M N   Use    return     Properties    region Name null  Address null    endregion     8  Press the saved shortcut key  See below result

User · Answer

the fastest way in Android Studio  or IntelliJ IDEA     highlight the code you want to surround it press ctrl   alt   t press c     then enter the description  enjoy

User · Answer

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

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Just intall and enable Coffee-Bytes plugin  Eclipse

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

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With Android Studio  try this     region VARIABLES private String  sMyVar1  private String  sMyVar2    endregion   Careful   no blank line after   region      And you will get

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On Mac and Android Studio follow this sequence    Highlight the source code to fold Press Alt Command t Select  lt editor-fold gt    Also you can select other options

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For Eclipse IDE the Coffee-Bytes plugin can do it  download link is here   EDIT   Latest information about Coffee-Bytes is here

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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    lt  code-fold  statement

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here is an example     region regionName   code   endregion   100  works in Android studio

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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

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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   gt   on keyboard

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The best way    region DESCRIPTION REGION int x   22     Comments String s    SomeString     endregion    Tip  Put     at the end of the  endregion

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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

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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   Download the plugin from here Extract the contents of archive Copy paste the contents of plugin and features folder to the same named folder inside eclipse installation directory Restart the eclipse Navigate Window  gt Preferences  gt Java  gt Editor  gt Folding  gt Select folding to use  Coffee Bytes Java  gt General tab  gt Tick checkboxes in front of User Defined Fold   Create new region as shown    Restart the Eclipse   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

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Jet Brains IDEA has this feature  You can use hotkey surround with for that  ctrl   alt   T   It s just IDEA feature   Regions there look like this     region Description  Some code    endregion

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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

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vscode I use vscode for java and it works pretty much the same as visual studio except you use comments     region name    code     endregion

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There s no such standard equivalent  Some IDEs - Intellij  for instance  or Eclipse - can fold depending on the code types involved  constructors  imports etc    but there s nothing quite like  region

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No equivalent in the language    Based on IDEs     For example in netbeans   NetBeans Creator supports this syntax       lt editor-fold defaultstate  collapsed  desc  Your Fold Comment  gt          lt  editor-fold gt    http   forums java net jive thread jspa threadID 1311

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