Like firebug for debugging javascript,
is there such a feature in eclipse? or do I need a plugin?
Use the Display view, or a bit quicker: highlight the code you want to run and right-click/Execute or Ctrl+U.
You can use the Display view to execute commands while debugging. You can find this in Window -> Show View -> Display
Select the line and press ctrl+shift+D or ctrl+shift+I
This will give the result in a popup.
Use the debug shell! Coming from node, I was pretty used to being able to mess with my env variables at any time using node --inspect in chrome, and so it was imperative for me to find the same experience in eclipse without having to use JDB.
To open the debug shell, go to Window → Show View → Debug Shell
After you write the code you wish to run, simply highlight it, right click, and execute (⌘U also works)
I believe that what you're looking for are "watch expressions". Just mark the piece of code in the source code view, right-click and select "Watch".
I'm currently using Eclipse Photon (v4.8.0).
Eclipse changed the "Display" View name to "Debug Shell View".
Here, you can execute commands on-the-fly.
you can use the 'Display' view to evaluate expressions in eclipse.
Look under the debug list of views. It is a standard par part of the java tooling so you don't need a plugin
Complementing all the amazing answers, for mac users is cmd + D
You can also create a scrapbook page (a .jpage) file and type your code in there. Then click run. It looked slightly more convenient when I tried it.
Like others say, you use the Display view. But for some variants of Eclipse, it may be named differently. For instance, if you are using Spring Tool Suite as your Eclipse, the View name corresponding to Display view is Debug Shell.
Related
On Visual Studio while developing using ASP.NET with C# or VB, I used to be able to execute code or call some APIs on the fly using the console or debug window.
I am asking if this can be done using Eclipse while debugging JSP or Java classes, and how?
Tarek
The Display view in Eclipse is used to do this. You can open using the shortcut Ctrl+3 and search for Display.
There, you can inspect, evaluate expressions and execute code during the current debug context. To execute code in the view for instance, you would select the code that is typed in the view and press Ctrl+U (the same can be done by right-clicking on the selection and clicking on the appropriate option from the context menu).
does netbeans have something like Eclipse Debug display view?
I love the interactive window for trying out Java code in Eclipse debug mode, and it's mentioned in this post:
Is there any Python-like interactive console for Java?
Just wondering if I can get the same in netbeans
There is a menu option: Debug - Evaluate Expression...
And also a shortcut: Ctrl+F9 (in Windows)
You can see an explanation at How to Evaluate Code
There isn't an interactive window for debugging quite like Eclipse, although you can set up breakpoints in the program while debugging to follow the step by step route in which the program executes. Have you looked at the NetBeans site? http://netbeans.org/features/java/debugger.html
While debugging, press ctrl+shift+I to evaluate an expression. In the "Evaluate Expression" window you can do the same as in eclipse's display window.
Some threads asked how to use the "Interactive Console" in Eclipse since you cannot type anything in this console.
Some suggested you can "Display view" to execute code.
So what is the purpose of the "Interactive Console" then?
Eclipse doesn't have an "Interactive Console" in it's default installation. It just has a "Display" view that you can use to execute Java code in debug mode in the scope of the current breakpoint (to evaluate expressions or to change data)
If you have an "Interactive Console", it's most likely a view from a plugin. I've read that a Google plugin might provide it. Or maybe a plugin for a scripting language like JRuby or Groovy.
If you say you have an "Interactive Console" and cannot type into it, then I suspect you're not in the right mode for the view to be active (maybe you're not working with the scripting language that provides the view).
Im sorry but the accepted answer is not correct.
The console in Eclipse is interactive, when a running application reads from the Console Input Stream.
It is not meant to be a feature of Eclipse to generally aid in debugging, it is meant to allow console based Java applications to read input from the user when debugging (as in I can type into a console prompt).
EARLIER ANSWER (accepted but not correct) :
The interactive console allows you to execute some extra code, while debugging, when stopped at via a `breakpoint`.
This is a really beneficial feature when you are debugging and suddenly want to change the value of variable, execute a sysout or some utility function.
FOR Correct Answer look at the answer below by #mmey.
I was curious if anyone knows a way (by using a setting or a plugin or something), that would allow me to select variable names on the fly in netbeans, in the same way that Visual Studio 2008 does using an automatic popup window? At the moment I can access them by pressing Ctrl + Space, but I wondered if there is a way that I could avoid this and just have them come up automatically as I type, and the methods would come up with the '.' operator as normal?
The settings in 'Tools->Options->Editor->Code Completion' doesn't seem to have the Ctrl + Space setting I'm looking for, only a tickbox for toggling the normal '.' code completion of method names on or off..
(if it helps, the version of Netbeans is 6.9.1, and I'm writing in Java for Glassfish)
I tried to get the desired feature by adding the alphabet to the completion selectors. It worked somewhat, you can always try it.
Goto:
Tools -> Options -> Editor -> Code Completion
Select
Language: [Java]
Check:
[X] Auto Popup on Typing Any Java Identifier Part
Completion Selectors for Java:
[.,;:([+-=abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVXYZ]
Good Luck!
This looks like it was a commonly requested feature for NetBeans, added back in 2009. The setting appears to be Tools -> Options -> Editor -> Code Completion -> Auto Popup Completion Window in those builds (discussion; see also).
The feature you're asking about from Visual Studio is IntelliSense, by the way. If you're looking for a terrific, IntelliSense-drive IDE for Java, you might want to consider IntelliJ.
In NetBeans preferences, choose the code completion; then chose Java instead of all languages; and then choose all the options. You will get it. Goodluck.
Yes, I got it.
Tools > Option > Editor > Code Compilation > Language > Java
That's so easy in NetBeans.
Invoke Code Completion
Inside NetBeans editor simply press Ctrl+spacebar
it will give suggestions for variables, methods, etc
I tried to get the desired feature by adding the alphabet to the completion selectors. It worked somewhat, you can always try it.
This works for the first two characters you type This is updated one
Goto:
Tools -> Options -> Editor -> Code Completion
Select
Language: [C/C++]
Autopop Triggers for C/C++ Identifiers
.;->;.*;->*;::;new ; 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Good Luck!
I have been wracking my brain trying to figure this out. For the first time I used jEdit the other day and I was pleasantly surprised that it auto indented my code (meaning that I'd put in the following code:
int method () {
_ //<-- and it put me here automatically
I've tried to get the same thing working with eclipse but with no success. I got into the code formatter but I don't see how to make that happen.
Is it possible to do this? Also while I'm here, is there a such thing as a eclipse plugin that will allow you to search the methods and classes of the standard java library?
Thanks
Personally all I use for this is the format options Window->preferences under Java->Code Style ->Formatter.
I once took the time to tweek how I like my code to look like when I work and exported the whole thing. After that I just code without too much bother on what it looks like. When I find the code looks messy by pressing the combination ctrl+shift+f and the whole class becomes pretty again, comments and all.
After a while it pretty much became a reflex...
code code code
ctrl-s, ctrl-b (cause I disable auto build sometimes), ctrl-shift-f
code some more etc...
Once I got used to this I never really cared how it presented the code as i was typing because I knew it would look all pretty as soon as the loop/if/switch/method etc is finished
My clean eclipse install does this by default.
Have you changed any options? Make sure the file you are editing has the .java file extension. The preference options that control the typing automations are under Java -> Editor -> Typing in the Window -> Preferences menu.
Also, I find that the auto-indenting, and most of the other auto-complete functions of eclipse do not function well if the file I am editing has errors in it which prevent compilation. Make sure that your curly-braces are matched correctly, this is the main one that I've noticed blocks auto-indent.
Regarding searching through the standard Java libraries, use the Search -> Java.. menu option, and check the JRE libraries checkbox, then search away. You can also use the Hierarchy view to see how the classes relate. Also, in the Package and Project views you can expand the JRE System Library, and then expand rt.jar which holds pretty much all the standard Java pacakges.
Eclipse has always done this for me by default.
One really cool thing about eclipse is that you can search preference pages. Just right click and go to prefrences. Go to the "Window" menu, and click "Prefrences". Then at the top of the tree view there's a text box that says "type filter text". Replace that with "indent" and it should bring up the page where the indent option is.
Make sure that eclipse recognizes your file as a java file, that you're using the Java distribution, the latest version, etc.
Iv been trying to work around the eclipse indenting and other supposed features for years, and it seems that the bottom line is this ...
It only works for the programming style of the authors, so to use it you need to modify your style to comply.
This would be OK except that the authors of eclipse have some very strange ideas about common shortcut keys.
One horrid example is the search features, eg when did Ctrl+K become "Find Next occurrence" and why doesnt F3 or n work?
That all being said I use eclipse because if you have the time to wait around while it starts up - or never close it - and you can modify everything youve learned about using an editor - why why why - then it will certainly increase your efficiency.
Please note that there is a preference setting for indenting, it can be set for a project, a workspace, or globally, but no matter how you set it eclipse will still chuck tab characters in where you dont want them.
In fact its indent crazy, like it wants to indent everything, even if its already indented.
Like I said Iv been using it for years and it STILL drives me nuts with its random behavior.
Follow these steps for Eclipse:
Select all text: ctrl+A
Correct indentation: ctrl+I
You should check:
Hidden features/tricks for Eclipse?
What is your favorite hot-key in Eclipse?