What is a shell? How does it work with the kernel? With the user?
What will be an ideal response?
A shell is a command interpreter; it starts the program you call from a com-
mand line and passes your instructions (arguments) to the program. The
shell is also a programming language; it can run files of commands, similar
to DOS batch files, when you issue a single command to the shell.
When you use a shell in interactive mode (from a command line), the kernel
accepts input from your terminal (by default) and passes it to the shell. It
also takes output from the shell and displays it on the screen (by default).
The shell accepts a command from a user, starts execution of the program
named in a command, and passes the command line to the program.
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Abstract classes do not necessarily have:
a. A 0 pointer in their vtable. b. A virtual function prototype with the notation = 0. c. Zero instances of their class. d. Zero references to their class.
To avoid duplicating code, use ________, rather than ________.
a. inheritance, the “copy-and-past” approach. b. the “copy-and-paste” approach, inheritance. c. a class that explicitly extends Object, a class that does not extend Object. d. a class that does not extend Object, a class that explicitly extends Object.
Which of the following statements is false?
a. You can set a Button’s text by double clicking it, or by selecting the Button, then setting its Text property in the Inspector window’s Properties section. b. A GridPane column’s contents are left-aligned by default. c. Setting a node’s Pref Width property of a GridPane column to USE_COMPUTED_SIZE indicates that the width should be based on the widest child. d. All of the above are true.
Refering to the accompanying figure, which section of the Paragraph dialog box shows how the paragraph will look after it is indented?
A. Indentation B. Spacing C. Preview D. Special