12+ Java Class Diagram Online. Our philosophy is to give you just enough to make diagrams that help communication, without getting bogged down in the technicalities of uml. From practical experience, class diagram is.
At minimum, the rectangle must include the class name. Position shapes precisely using the alignment guide. Class diagrams are a neat way of visualizing the classes in your system before you actually start coding them up.
Besides using rectangles to represent classes, class diagrams include arrows to represent relationships among classes.