Discussion
Which of these is the correct package declaration for importing every concurrency utility including the locks?
Answer: D
Correct answer: import java.util.concurrent.*; import java.util.concurrent.locks.*;
A wildcard import covers one package and not its subpackages, so java.util.concurrent.* does not bring in the locks. Two imports are needed, and there is no double-asterisk form in Java for reaching a package tree.
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