University:
California State University, Northridge
Course:
COMP 110 | Introduction to Algorithms and Programming and Lab
Academic year:

2023
Views:

161

Pages:

10
Author:

Samuel K

Quiz 5Due Oct 06, 2023 at 11:45amPoints 40Questions 20Time Limit 75 MinutesQuestion 12 ptsWhat is an array in Java?A collection of objectsA sequence of charactersA data structure to store elements of the same typeA variableQuestion 22 ptsHow do you declare an array in Java?int array[];array int[];int[] array;Both a and C Question 32 ptsWhat is the index of the first element in an array?01-1The index is not relevantQuestion 42 ptsWhich method is used to find the length of an array in Java?length()size()count()getSize() Question 52 ptsWhat is the drawback of using arrays in Java?Arrays cannot store primitive data typesArrays have a fixed sizeArrays are not iterableArrays can only store objectsQuestion 62 ptsWhich class is part of Java's collection framework and implements adynamic array?VectorArrayListLinkedListArraySet Question 72 ptsWhat is the key difference between ArrayList and LinkedList in Java?ArrayList allows random access. while LinkedList does notLinkedList allows faster insertion and deletion, while ArrayListdoes notBoth a and bNeither a nor bQuestion 82 ptsWhich interface does ArrayList implement in Java?SetListMapCollection Question 92 ptsIn Java, how do you remove an element at a specific index from anArrayList?remove(index)delete(index)erase(index)clear(index)Question 102 ptsWhich method is used to add an element to the end of a LinkedList inJava?addLast()append()insertLast()addToEnd() Question 112 ptsWhat is the purpose of the 'iterator' in Java's collection framework?To find the index of an elementTo iterate over the elements of a collectionTo perform mathematical operations on elementsTo retrieve the last element in a collectionQuestion 122 ptsWhich method is used to check if an ArrayList is empty in Java?isEmpty()isNull()hasElements()checkEmpty() Question 132 ptsWhat is the difference between an array and an ArrayList in Java?Arrays have a fixed size, while ArrayLists can dynamically resizeArrays can only store primitive data types, while ArrayLists canstore objectsBoth a and bNeither a nor bQuestion 142 ptsWhich data structure is used to implement a HashSet in Java?ArrayLinkedListTreeMapHashMap Question 152 ptsWhat is the primary advantage of using a HashSet over an ArrayList?HashSet allows duplicate elementsHashSet maintains order of insertionHashSet provides constant-time performance for basicoperationsHashSet supports random accessQuestion 162 ptsWhich method is used to add an element to a HashSet in Java?insert()addElement()add()put() Question 172 ptsWhat is the role of the "Comparator" interface in Java collections?To compare primitive data typesTo compare objects based on their natural orderTo provide a comparison method for user-defined orderingTo perform sorting of elementsQuestion 182 ptsIn Java, which collection class is synchronized?ArrayListLinkedListVectorHashSet Question 192 ptsWhat is the purpose of the 'Map' interface in Java's collectionframework?To store elements with unique keysTo maintain the order of elementsTo provide constant-time performance for basic operationsTo implement a dynamic arrayQuestion 202 ptsWhich method is used to retrieve the value associated with a key in aHashMap?getValue()findValue()get()retrieve()