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To create a new variable from an expression:
Place
your cursor on the expression which you would like to replace with a variable.
Right-click
and select Refactor | Extract Variable
-Or- press Alt+Shift+L.
The Extract Local Variable dialog is launched.

Ensure the name of the variable
which you would like to create is entered in the Variable name field.
Mark the checkbox so that
all occurrences of the selected expression will be replaced by references
to the local variable.
Click OK to apply your changes
or click Preview if you want to see a preview of the changes that this
refactoring will create.
If you clicked preview a
preview window will open with a changes tree showing all the changes which
will be made to reflect the extracting of the variable.

The changes will be listed
according to the context within which they appear. You can therefore expand
the nodes to see all changes within particular files, classes or functions.
Use the Next / Previous
Change arrows to scroll through all possible changes.
Unmarking the checkboxes next to the changes will cause those changes
not to take effect.
Click OK to apply the changes.
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