Though Java prevents multiple inheritance, some circumstances warrant its use. ... The technique described in this article simplified the drag-and-drop implementation.

Java doesn’t support multiple inheritance through class extension, however. When viewing an inheritance hierarchy, you can easily detect multiple inheritance by the presence of a diamond pattern.

Java's open inheritance model can feel like an open invitation to unintended extensions. ... The non-sealed keyword brings flexibility into the rigid world of sealed classes, to allow a particular ...