The `java.nio.channels.FileChannel.tryLock` is a method in the Java programming language which allows a program to attempt to acquire an exclusive lock on a file channel. This method returns a `java.nio.channels.FileLock` object if successful, or null if the lock could not be acquired. The purpose of this method is to ensure exclusive access to a file channel, preventing other programs or threads from modifying the contents of the file while it is being accessed by the locking program.
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