Develop Reference

In Intellij Idea, how to keep showing context information?

I know for sure that by clicking hot key alt + q, the context of current method or class could show up just like:
But is there any way to make the IDE keep showing the context information at the top of the edit area?

You can't keep the method definition for the 'currently active' method pinned to the top of the editor but if your goal is to display the method definition for the 'currently active' method while you are editing that method then you could use the Structure tool window and select Autoscroll from source. This will show you the definition of the method you are currently editing / your cursor is currently sitting in.
Here's a screenshot:
Autoscroll from source is the last icon on the right at the top of the Structure tool window.
You can activate the Structure tool window via keystokes (e.g. ALT 7), to identify the correct keystroke just have a look at the keystroke associated with the menu item: View > Tool Windows > Structure.
More details in the docs

Bizzare JFileChooser situation, the right click menu text is blank

I am using a bare bones JFileChooser on Redhat 6 with the code:
JFileChooser testFileChooser = new JFileChooser("Test");
testFileChooser.showOpenDialog(this);
The JFileChooser works as expected. In the file selection area, if I right click, I get a dialog with three rows, one with an arrow. There is no text describing what the rows does. The first row switches between list and detail views. The second row appears to do nothing and the third row creates a new folder. When I googled about this problem there appears to be no way to access or inspect this right-click popup dialog of the JFileChooser. I do not understand how it could break in the first place like this. I need ideas for how to fix or workaround this problem please.

I've found a fix/workaround!
JFileChooser uses a FilePane internally, which uses the JFileChooser's getComponentPopupMenu as it's context menu. However, because that returns null, it creates its own.
The text on the labels are gotten from the UIManager, with UIManager.getString calls. For some reason, the UIManager is returning empty strings.
So, we just have to set the strings in the UIManager manually.
If you make these calls before creating the file chooser, that'll fix it.
UIManager.put("FileChooser.detailsViewActionLabelText", "Details");
UIManager.put("FileChooser.listViewActionLabelText", "List");
UIManager.put("FileChooser.viewMenuLabelText", "View");
UIManager.put("FileChooser.refreshActionLabelText", "Refresh"));
UIManager.put("FileChooser.newFolderActionLabelText", "New Folder");
I realize this is 4 years late, but I hope this helps.

JCheckBoxes inside JComboBox

I have added checkboxes inside combo box in Java. But when I open drop down menu and check one check box, the drop down menu closes. So to select each check box I have to open it every time.
Is there any way so that I can keep the drop down list opened till the time I dont click outside so that I can select any number of check boxes at one time only.
Please help!!

I have added checkboxes inside combo box in Java. But when I open drop
down menu and check one check box, the drop down menu closes. So to
select each check box I have to open it every time. Is there any way
so that I can keep the drop down list opened till the time I dont
click outside so that I can select any number of check boxes at one
time only.
no there isn't, this is default property of (BasicXxx)Popup implemented in Swing API, workaround for series of Bugs in Java1.4_xxx
no_way, only by using dirty hacks, usage of can be Java Version sensitive, or required left mouse button as accelerator
don't do that, another way (and proper of possible ways) is usage of JWindow/undecorated JDialog but required to override ESC Key and Focus lost in Windows three (as you can see in good Java JCalandars/JDatePickers),

I recommend that you to use the Japura API to deal with this, check this link:
http://www.japura.org/checkcombobox
Best Regards :)

JFileChooser set multi selection mode

I am attempting to use a JFileChooser to select multiple files. I know I can setMultiSelectionEnabled(true) but this selects all the files between the first file clicked and the second. Is there a way to make it only select the files that are clicked? I am looking for something similar to the MULTIPLE_INTERVAL_SELECTION in JList.

You can do so by holding Control (Ctrl) button while clicking the selections. The selection behaviour is standard behaviour and cannot be controlled programmatically.

Dynamically add Textbox to Window when checkbox is checked

I'm just figuring out my way around SWT. I have a little problem that i cant seem to solve. I have a check-box in my window. When the check-box is checked, i would like add a multi-line, read-only, text box below it, lets say 200x200. I want the height of the window to increase to accommodate this text-box. When the check-box is unchecked I'd like the opposite to happen.
Could you help me with this? I can't find an example but maybe I'm not using the right keywords. Cheers.
--EDIT
the.duckman'ss answer was very helpful. I've managed to get it working to some extent. I'm adding a multi-line textbox 480px high. How do I automatically resize the window to accommodate the text box? When the user checks the checkbox, the textbox shows up but the height of the window doesn't increase to accommodate the textbox. My code is a little long so I've put it in PasteBin — http://pastebin.com/01RxKeEr
Thanks.

I recommend looking at the SWT Snippets to every beginner - that's probably the best place to go to with SWT questions.
This snippet does exactly what you want.
Edit
Ooops, I ignored the second half of your question, sorry. Simply add this line to your listener:
shell.setSize(shell.computeSize(SWT.DEFAULT, SWT.DEFAULT));