How does generic type bounds behave in multithreaded code?

Generic type bounds in Java define constraints on the types that can be used as parameters in generic classes and methods. When used in multithreaded code, these bounds help ensure that the types passed to generics are thread-safe or can be safely used in concurrent environments. However, the behavior can vary based on how the shared resources, defined by those generics, are accessed by different threads.

In a multithreaded context, it's essential to synchronize access to any shared data. Using generic collections or types with proper bounds can help create more robust and type-safe concurrent code. Locking mechanisms must still be put in place to prevent concurrent modification issues.