Which of the following is false about interfaces?
a) An interface describes a set of methods that can be called on an object, providing a default implementation for the methods.
b) An interface describes a set of methods that can be called on an object, without
providing concrete implementation for the methods.
c) Interfaces are useful when attempting to assign common functionality to possibly
unrelated classes.
d) Once a class implements an interface, all objects of that class have an is-a relationship
with the interface type.
a) An interface describes a set of methods that can be called on an object, providing a default implementation for the methods.
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Write the commands to remove all the space characters stored in the shell variable text. Be sure to assign the result back to text. First use tr to do it and then do the same thing with sed.
What will be an ideal response?
The main site navigation or a section offering navigation choices should contain:
a. visually grouped sections of hyperlinks b. as many hyperlinks as you need c. only the most important pages d. only four hyperlinks