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Figure 20 – The popup menu of a class in BlueJ.
5.2.1
UML style class diagrams
The main display of BlueJ is a simplified UML diagram of the classes in the system.
Each class is displayed as an icon with different styles of shading to indicate
compilation status and with UML stereotypes to indicate different class types such
as “«abstract»”, “«interface»” or “«applet»”. There are two different relationships
between classes that are shown on the diagram. Inheritance relationships are shown
with a solid lined arrow and references between classes are shown as dashed lines.
The relationships can be specified by interacting with the diagram (which creates
the corresponding relationship in the source) or can be specified by editing the
source (which automatically reflects back in the diagram). Figure 19 shows the main
display of BlueJ.
Each of the classes displayed has a popup menu (selected by right clicking on the
class – shown in Figure 20) that can be used to compile the class, open the source
editor (double-clicking on the class is a short cut to this operation), remove the class
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