A Java library that permits to draw two-variables diagrams in a Cartesian plan.
BS Editor: Plot4j is a Java library that permits to draw two-variables Diagrams in a Cartesian plan. The diagrams can be exported as images or visualized on Java Swing panels.

If in your desktop application you want to show real-time data, and your graphs must refresh every n seconds, lets say 2 seconds, you can set a refresh interval to your DiagramPanel:

diagramPanel.setRefreshInterval(2000);

In this way, the DiagramPanel will read the data every 2 seconds, refreshing the diagram on the screen. you can free download Plot4j 0.1 now.