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JAVA 3 LECTURE REVIEW

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Question 12 points

The best-case performance for a shell sort is: ---

O(1)

O(n2)

O(n)

O(n log n)

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Question 22 points

The best-case performance for an array of n items using insertion sort is: ---

O(n2)

O(n)

O(1)

there is no best-case

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Question 3 2 points

A recursive method that processes a chain of linked nodes ---

uses the first node in the chain

uses the last node in the chain

divides the chain in half placing the middle node in the left chain

divides the chain in half placing the middle node in the right chain

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Question 42 points

An expression that has correctly paired delimiters is called a(n) ---

Reverse Po0lish expresson

infix expression

balanced expression

algebraic expression

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Question 52 points

In a vector implementation of a Stack ADT, you clear all of the contents of a stack using which vector method? ---

delete

clear

deleteAll

none of the above

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Question 62 points

The pop and peek methods throw a(n) ________ exception when the stack is empty. --

runtime

checked

compile time

stackEmpty

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Question 72 points

In an array-based chain implementation of a Stack ADT, what is the performance of the ensureCapacity method when the array is not full? ---

O(n)

O(1)

O(n log n)

O(n2)

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Question 82 points

Which statement is true about the VectorStack class methods? ---

they invoke the methods of the Vector class.

they require slightly more execution time than the ArrayStack methods.

both a & b

none of the above

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Question 92 points

Reverse polish notation is another term for a(n) --

postfix expression

prefix expresson

infix expression

algebraic expression

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Question 102 points

Recursive methods ---

do not use an if-statement

are useful when each recursive call is a solution to a smaller, identical problem

are not useful in programming

all of the above

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Question 112 points

The O(n2) analysis of insertion sort is a(n) _______ analysis. --

worst case

best case

average case

unknown

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Question 122 points

Traversing a chain of linked nodes ---

is easier to do iteratively than recursively

is easier to do recursively than iteratively

is impossible to do recursively

is easy to do iteratively

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Question 132 points

In a vector implementation of a Stack ADT, you check for an empty stack using which vector method? ---

empty

stackEmpty

isEmpty

none of the above

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Question 142 points

What object behaves like a high-level array? ---

linked-chain

vector

array-chain

all of the above

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Question 152 points

Which method accesses the last entry of a vector? ---

last

lastElement

endOfVector

you can't access the last entry directly

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Question 162 points

In a vector implementation of a Stack ADT, you add an entry to the top of a stack using which vector method? ---

add

push

put

none of the above

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Question 172 points

Stacks exhibit which type of behavior? --

first in, last out

first in, first out

last in, first out

last in, first out

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Question 182 points

What happens when a recursive method does not reach the base case? ---

the program crashes

a stack overflow occurs

both a and b

none of the above

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Question 192 points

When you remove an item from a stack, you remove it from --

the bottom

the middle

the top

wherever the client specifies

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Question 202 points

When you add an item to a stack, you place it --

on the bottom

on the top

in the middle

it doesn't matter where

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Question 212 points

What question should you keep in mind when debugging a recursive method? ---

Does each base case produce a result that is correct for that case?

are there enough base cases?

is at least one of the cases a base case that has no recursive call?

All of the above

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Question 222 points

What is the efficiency of the iterative selection sort method for a chain of n linked nodes? --

O(2n)

O(n)

O(n log n)

O(n2)

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Question 232 points

In a vector implementation of a Stack ADT, you retrieve the top entry without removing it using which vector method? ---

peek

look

lastElement

none of the above

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Question 242 points

The shell sort works by ---

using insertion sort on subarrays of equally spaced entries.

using insertion sort on subarrays of equal size consecutive entries.

iteratively searching for the smallest entry in subarrays of equally spaced entries.

iteratively searching for the smallest entry in subarrays of equal size consecutive entries.

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Question 252 points

What question should you keep in mind when debugging a recursive method? ---

Should a for-loop be included in the method?

Are the activation records correct?

if the method returns a value, does each of the cases return a value?

All of the above

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Question 262 points

Recursion can be used to solve problems like ---

processing linked chains

processing arrays

sorting

all of the above

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Question 272 points

The operation to add an entry to a stack is called a(n) --

add

put

push

peek

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Question 282 points

When a vector needs to increase its size ---

the capacity is doubled

the capacity is increased by 10 empty entries

the capacity is increased by 1 as needed

the capacity increase is user-defined

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Question 292 points

Recursive methods need a(n) ---

for loop

base case

trace

all of the above

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Question 302 points

When too many recursive calls are made creating more activation records than the allocated program memory can handle, what kind of error occurs? ---

recursive overflow

infinite recursion

activation record overflow

stack overflow

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Question 312 points

What is the efficiency of the insertion sort method for a chain of n linked nodes? ---

O(2n)

O(n)

O(n2)

O(n log n)

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Question 322 points

In a vector implementation of a Stack ADT, you remove an entry from the top of a stack using which vector method? ---

remove

pop

retrieve

none of the above

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Question 332 points

The precedence of an operator in a postfix expression --

is always left-to-right

is always right-to-left

is implied by the order in which the operators and operands occur

depends on the compiler implementation

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Question 342 points

The best-case scenario for an insertion sort is --

the elements are in reverse sorted order

the elements are already in sorted order

the elements are in random order

there is no best-case scenario

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Question 352 points

Shell sort can be improved by: ---

using selection sort instead of insertion sort as the final step.

alternating insertion sort and selection sort each iteration.

you cannot improve the algorithm's time efficiency.

adding 1 to the space when it is even.

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Question 362 points

In an array-based chain implementation of a Stack ADT, what is the performance of the ensureCapacity method when the array is full? ---

O(1

O(n)

O ( n log n )

O(n2)

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Question 372 points

The operation to remove all entries from a stack is called a(n) --

clear

remove

removeAll

empty

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Question 382 points

In the Java Class Library, the default constructor Vector creates an empty vector with an initial capacity of ---

0

100

10

user-defined

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Question 392 points

The best-case scenario for an selection sort is: --

there is no best-case scenario.

the elements are in reverse sorted order.

the elements are in random order.

the elements are already in sorted order.

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Question 402 points

A reasonable action when attempting to remove an item from an empty stack is --

assume a precondition that the stack is not empty has been met

throw an exception

return null

all of the above

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Question 412 points

The average-case performance for shell sort is: ---

O(n2)

O(n2.5)

O(n1.5)

O(n3)

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Question 422 points

A method that calls itself is called a ---

base method

iterative method

recursive method

dynamic method

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Question 432 points

The condition when a recursive method does not satisfy a base case it is called ---

finite recursion

iterative recursion

infinite recursion

baseless recursion

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Question 442 points

Which sorting algorithm is generally the slowest for a large number of items? ---

insertion sort

selection sort.

shell sort.

they are all the same.

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Question 452 points

Polish notation is another term for a(n) --

postfix expression

prefix expression

infix expression

algebraic expression

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Question 462 points

What is the base case in the recursive selection sort method? ---

the array is found to be sorted.

the array is empty.

there is no base case.

the array has only one element.

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Question 472 points

The worst-case performance for shell sort is: ---

O(n1.5)

O(n2)

O(n2.5)

O(n3)

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Question 482 points

What question should you keep in mind when debugging a recursive method? ---

is there at least one recursive call?

Did you consider all possible cases?

Does the method contain a statement to test an input value and leads to different cases?

All of the above

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Question 492 points

The operation to return a stack's top entry is called a(n) --

get

tp

peek

pop

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Question 502 points

The operation to retrieve the top entry of a stack without removing it is called --

pop

look

peek

top

Answer 1

Answer:

1)  O(n)
2)  O(n)
3)  uses the first node in the chain
4)  balanced expression

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