We all know about the diamond problem regarding multiple inheritance -
A
/ \\
B C
\\ /
D
This problem describe an ambiguous
Java doesn't support multiple inheritance, so the diamond problem doesn't arise. If B & C are interfaces, then there is no implementation in the interfaces. Even if B & C override the method in interface A (cannot be a class), the methods will have same signature. There is no ambiguity regarding which implementation to use, because there is no implementation.