How can a heap be used to implement a priority queue?
What will be an ideal response?
Elements in a heap must be Comparable, which means that they have a compareTo method. The
compareTo method can be written so that the element that has greater priority is ‘greater than’ an element with lower priority.
If the priorities are the same, then the positions in the queue determine the resulting relation between the elements.
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Which statement is false?
a. The compiler always creates a default constructor for a class. b. If a class’s constructors all require arguments and a program attempts to call a no-argument constructor to initialize an object of the class, a compilation error occurs. c. A constructor can be called with no arguments only if the class does not have any constructors or if the class has a public no-argument constructor. d. None of the above.
The /etc/login.defs file is a(n) ____ file.
A. binary B. text C. encrypted D. hidden
The SUM function
A) identifies the midpoint value in a set of values. B) displays the lowest value in a range. C) calculates the arithmetic mean or average of values in a range. D) calculates the total of values contained in two or more cells.
Where do IPv6 addresses other than link-local get their subnet masks?
A. IANA B. EUI-64 C. from their routers D. manually configured