Java does not support multiple inheritance to avoid the complexity and ambiguity it introduces, especially in method resolution. In multiple inheritance, if two parent classes have a method with the same signature, it becomes unclear which method the child class should inherit. This issue, commonly referred to as the 'diamond problem,' can lead to confusion and potential conflicts in the behavior of the program. Simplicity and readability in object-oriented programming are enhanced by Java. It allows multiple interfaces to be implemented by a class without facing the dangers associated with multiple inheritance.
Multiple inheritance in Java is avoided because there would be many potential complications involved in method resolution. The "diamond problem" refers to potential conflict that arises as a result of this mechanism, which results from ambiguity related to which of the two inherited classes should a method belong to a subclass that directly inherits the common method. Such ambiguity is responsible for many unstable behaviors, causing code management challenges.