What are the scenarios where zero-copy is used in Java?

Java zero-copy technology can improve system performance and efficiency, and is suitable for the following scenarios:

1. Network Transmission: In network programming, zero-copy technology can prevent data from being copied multiple times between user space and kernel space, thus improving data transmission efficiency.
2. File operation: In file operations, zero-copy technology allows direct manipulation of file memory mappings, reducing the need for data to be copied multiple times between memory and disk, thus improving the efficiency of file read and write operations.
3. When working with databases, zero-copy technology can reduce the need for data to be copied multiple times between an application and database, enhancing the efficiency of database operations.
4. Image processing: Zero-copy technology in image processing can eliminate the need for multiple copies of image data, thus improving the efficiency of image processing.
5. Message queue: Zero-copy technology can reduce the number of copies of messages between producers and consumers when using message queues, thereby improving the efficiency of message delivery.

Overall, zero-copy technology is suitable for any scenario that involves a large amount of data transfer and processing, as it can improve system performance and efficiency.