How can files be transferred in Java?

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There are several ways to transfer files in Java, including:

1. Using Input and Output Streams - this involves creating an input stream to read the file, and an output stream to write the file to the destination location.

2. Using the FileChannel class - this class provides a platform-independent way to transfer files using file channels, which can read from and write to files.

3. Using the FTP (File Transfer Protocol) library - this library allows for files to be transferred over the internet using the FTP protocol.

4. Using the HTTP (Hypertext Transfer Protocol) library - this library allows for files to be transferred over the internet using the HTTP protocol, typically over a secure SSL/TLS connection.

5. Using the Apache Commons Net library - this library provides a set of tools for transferring files over various protocols, including FTP, SFTP (Secure FTP), and FTPS (FTP over SSL/TLS).