The ____ command activates the default database.

Which operation is not supported in constant time by a double-ended queue (deque)?

a. Insertion at the front or rear item b. Access of the front or rear item c. Deletion of the front or rear item d. Access and deletion of the minimum item e. all of the above are supported

Answer the following statements true (T) or false (F)

a) You must explicitly create the stream objects System.in, System.out and System.err b) When reading data from a file using class Scanner, if you wish to read data in the file mul- tiple times, the file must be closed and reopened to read from the beginning of the file. c) Files static method exists receives a Path and determines whether it exists (either as a file or as a directory) on disk. d) XML files are not human readable in a text editor. e) An absolute path contains all the directories, starting with the root directory, that lead to a specific file or directory. f) Class Formatter contains method printf, which enables formatted data to be output to the screen or to a file.