How does URL/URI behave in multithreaded code?

In a multithreaded environment, the behavior of URL and URI objects must be understood carefully. Both URL and URI classes in Java are immutable which means their state cannot be changed after creation. This immutability makes them inherently thread-safe, allowing multiple threads to access the same URL or URI object without the risk of data corruption. However, when working with mutable objects or resources that URL and URI may reference, developers must ensure proper synchronization to prevent issues like race conditions.