Home » Newcomers » Newcomers » Confused with Refresh, Project->Clean, Run ...
| Confused with Refresh, Project->Clean, Run ... [message #189729] |
Wed, 24 January 2007 15:14  |
Eclipse User |
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Originally posted by: www.nospam.net
Hi,
I am still not clear about several concepts. (I am using Eclipse on Linux.)
(1)Say, I have a Eclipse workspace, Test_Workspace. If I have moved a
java file, Test.java to /home/Test_Workspace/src/. I need to use
Refresh. Correct?
(2)If I have modified Test.java file, I need to use Run->Run As->Java
Application. Correct?
Usually, there is a compiling step (javac Test.java) and running step
(java Test). I am not clear the above procedure is doing both(javac
Test.java and java Test) or is just doing java Test
(3)There is a green arrow button just below menu bar. What does it mean
by clicking it? If I have modified Test.java, I can NOT just click the
green arrow button, because it does not recompile Test.java and will not
show the effect of modification, correct?
(4)When I need to use Project->Clean ?
Thank you very much.
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| Re: Confused with Refresh, Project->Clean, Run ... [message #189769 is a reply to message #189729] |
Wed, 24 January 2007 17:06  |
| Eclipse User |
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Originally posted by: wharley.bea.com
"www" <www@nospam.net> wrote in message
news:ep7t48$j1u$1@utils.eclipse.org...
> Hi,
>
> I am still not clear about several concepts. (I am using Eclipse on
> Linux.)
>
> (1)Say, I have a Eclipse workspace, Test_Workspace. If I have moved a java
> file, Test.java to /home/Test_Workspace/src/. I need to use Refresh.
> Correct?
That's correct. Whenever you make changes to the filesystem from "outside"
of Eclipse, in order for Eclipse to find out about it you need to Refresh.
Otherwise Eclipse won't know about the new file.
Of course, if you create or move the file by using Eclipse commands, then
Eclipse knows about it automatically and Refresh is not necessary.
> (2)If I have modified Test.java file, I need to use Run->Run As->Java
> Application. Correct?
>
> Usually, there is a compiling step (javac Test.java) and running step
> (java Test). I am not clear the above procedure is doing both(javac
> Test.java and java Test) or is just doing java Test
If you have Project -> Build Automatically turned on, then whenever you save
a file or do something similar (like moving a file from outside and
Refreshing), a build will automatically take place. This build uses the
Eclipse internal compiler, not javac, but the end result is the same.
If you have Build Automatically turned off, then you need to build by hand,
by choosing the Project -> Build command.
> (3)There is a green arrow button just below menu bar. What does it mean by
> clicking it? If I have modified Test.java, I can NOT just click the green
> arrow button, because it does not recompile Test.java and will not show
> the effect of modification, correct?
Depends whether you have Build Automatically turned on,
> (4)When I need to use Project->Clean ?
In theory, you never need to. But sometimes incremental builds get messed
up. If you find bizarre things happening (for instance, it seems like the
wrong code is getting executed), it's often good to do a Clean just in case.
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