Treemap Viewer in JOverflow
Treemaps are used to visualize the memory usage by classes. It helps to identify the resources consuming most RAM or memory. Like JOverflow instance viewer, the treemap viewer utilizes the filter feature provided by JOverflow.
To enable JOverflow Treemap view in JMC, go to the menu item Window, Show View, Other, JOverflow, and then JOverflow Treemap. Click Open.
Here is a sample image of JOverflow Treemap:
Figure 4-6 JOverflow Treemap

The squarified treemap is displayed where memory usage is aggregated by class and package names. The larger area depicts more memory consumed by the class or package. The background colors indicate the treemap nodes at different levels.