A.No change is required.

B.Make the declaration of lock static.

C.Replace the lock constructor call with new ReentrantLock (true).

D.Move the declaration of lock inside the foo method.

A.Test.class - > java.sql
Test.class -> java.base

B.Test.class - > java.sql
java.sql -> java.base

C.

D.On execution, the jdepscommand displays an error.
Test.class -> java.base

A.B, because all values provided by the calling code should be enquoted.

B.A, because it sends exactly the value of user provided by the calling code.

C.A and B are functionally equivalent.

D.B, because enquoting values provided by the calling code prevents SQL injection.

E.A, because it is unnecessary to enclose identifiers in quotes.

A.Implement AutoCloseable and override the close method.

B.Extend AutoCloseable and override the close method.

C.Implement AutoCloseable and override the autoClose method.

D.Extend AutoCloseable and override the autoClose method.

A.null

B.A NoSuchElementException is thrown at run time.

C.Duke

D.A NullPointerException is thrown at run time.