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Home / Class Diagrams / Class Diagram Notations / Lines

In addition to notes, you can add lines to a diagram.  The default is a solid black line, with no arrows.  You can change the line’s width, patterns and/or arrowheads, as well as color. You can also reverse the direction the line’s arrow is pointing with a right mouse click on the line to select Edit | reverse direction.
 

You can also add labels to the link. Select View | Labels when you right mouse click on a line, then specify labels for the head, middle, and tail of the line in the dialog below.
 

This is an example of what a line will look like with labels.  Arrowheads were added to make it easier to see.