Question 514 of 513
1Z0-829 Java I/O API and Securing Applications Practice Question
Which class from the java.nio.file package is most appropriate for efficiently transferring data between two channels on the same machine?
⚠ Common exam trap
Test-takers frequently confuse high-level convenience methods like `Files.copy()` or `InputStream.transferTo()` with low-level channel operations, failing to recognize that the question specifically asks for 'most efficient' transfer between channels, which requires zero-copy via `FileChannel.transferTo()`.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
FileChannel.transferTo(long, long, WritableByteChannel)
`FileChannel.transferTo()` (and its counterpart `transferFrom()`) uses the operating system's zero-copy mechanism (e.g., `sendfile()` on Linux or `TransmitFile()` on Windows) to move data directly between file system caches and the target channel without intermediate buffers or user-space copies. This makes it the most efficient approach for transferring data between two channels on the same machine, as it minimizes CPU overhead and memory bandwidth usage.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Files.copy(Path, Path)
Why it's wrong here
Uses streams; not zero-copy.
- ✗
RandomAccessFile.getChannel().write(ByteBuffer)
Why it's wrong here
Manual buffer copy; less efficient.
- ✗
InputStream.transferTo(OutputStream)
Why it's wrong here
Stream-based copy; not optimal for channels.
- ✓
FileChannel.transferTo(long, long, WritableByteChannel)
Why this is correct
Zero-copy transfer between channels.
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Last reviewed: Jun 25, 2026
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