QUESTION 10 Assume you have created a linked list namde myList that currently ho

Question

QUESTION 10

Assume you have created a linked list namde myList that currently holds some number of String objects. Which of the following statements correctly adds a new element to the beginning of myList?

myList.addFirst("Harry");

myList.add("Harry");

myList.insert("Harry");

myList.put("Harry");

1 points   

QUESTION 11

Consider the following code snippet:

What output will be produced when this code is executed?

ab,abc,a,

a,abc,ab,

a,ab,abc,

abc,ab,a,

1 points   

QUESTION 12

You need to access values by their position. Which collection type should you use?

TreeSet

ArrayList

Stack

Queue

1 points   

QUESTION 13

What can a generic class be parameterized for?

properties

iterators

type

methods

1 points   

QUESTION 14

Which method is NOT part of the ListIterator interface?

delete

add

next

previous

1 points   

QUESTION 15

You want to enumerate all of the keys in a map named myMap whose keys are type String. Which of the following statements will allow you to do this?

1 points   

QUESTION 16

In a linked list data structure, when does the reference to the first node need to be updated?

I inserting into an empty list

II deleting from a list with one node

III deleting an inner node

I

II

I and II

III

1 points   

QUESTION 17

Which of the following algorithms would be efficiently executed using a LinkedList?

Tracking paths in a maze.

Binary search.

Remove first n/ 2 elements from a list of n elements.

Read n / 2 elements in random order from a list of n elements.

1 points   

QUESTION 18

To create a TreeSet for a class of objects, the object class must ____.

create an iterator.

implement the Comparable interface.

implement the Set interface.

create a Comparator object.

1 points   

QUESTION 19

You need to write a program to simulate the effect of adding an additional cashier in a supermarket to reduce the length of time customers must wait to check out. Which data structure would be most appropriate to simulate the waiting customers?

map

stack

queue

linked list

1 points   

QUESTION 20

What is the meaning of the type parameter E, in the LinkedList<E> code fragment?

The elements of the linked list are of class E.

The elements of the linked list are of any subclass of class E.

The elements of the linked list are any type supplied to the constructor.

The elements of the linked list are of class Object.

myList.addFirst("Harry");

myList.add("Harry");

myList.insert("Harry");

myList.put("Harry");

Explanation / Answer

QUESTION 10 : myList.addFirst("Harry");

addFirst() method adds at the begining of the list.

QUESTION 11 : ab,abc,a,

The element added first will be removed first in queue.

QUESTION 12: ArrayList

get(index) method is used to get any element in the arraylist.

QUESTION 13: type

generics are used to different datatypes

QUESTION 14: delete

it has remove() method not delete()

QUESTION 15 :

QUESTION 16 : I and II

I inserting into an empty list

II deleting from a list with one node

QUESTION 17 :

Read n / 2 elements in random order from a list of n elements.

QUESTION 18: create a Comparator object.

QUESTION 19: queue

QUESTION 20: The elements of the linked list are of class E.

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