gs gs128 Java Util Collections Framework - Java List - Quiz No.1
gs gs128 Java Quiz
This quiz belongs to book/course code gs gs128 Java of gs organization. We have 136 quizzes available related to the book/course Java. This quiz has a total of 10 multiple choice questions (MCQs) to prepare and belongs to topic Java Util Collections Framework. NVAEducation wants its users to help them learn in an easy way. For that purpose, you are free to prepare online MCQs and quizzes.
NVAEducation also facilitates users to contribute in online competitions with other students to make a challenging situation to learn in a creative way. You can create one to one, and group competition on an topic of a book/course code. Also on NVAEducation you can get certifications by passing the online quiz test.
Question 1: How can we remove an object from ArrayList?
remove() method
using Iterator
remove() method and using Iterator
delete() method
Question 2: How to remove duplicates from List?
HashSet<String> listToSet = new HashSet<String>(duplicateList);
HashSet<String> listToSet = duplicateList.toSet();
HashSet<String> listToSet = Collections.convertToSet(duplicateList);
HashSet<String> listToSet = duplicateList.getSet();
Question 3: How to sort elements of ArrayList?
Collection.sort(listObj);
Collections.sort(listObj);
listObj.sort();
Sorter.sortAsc(listObj);
Question 4: When two threads access the same ArrayList object what is the outcome of the program?
Both are able to access the object
ConcurrentModificationException is thrown
One thread is able to access the object and second thread gets Null Pointer exception
One thread is able to access the object and second thread will wait till control is passed to the second one
Question 5: How is Arrays.asList() different than the standard way of initialising List?
Both are same
Arrays.asList() throws compilation error
Arrays.asList() returns a fixed length list and doesn’t allow to add or remove elements
We cannot access the list returned using Arrays.asList()
Question 6: What is the difference between length() and size() of ArrayList?
length() and size() return the same value
length() is not defined in ArrayList
size() is not defined in ArrayList
length() returns the capacity of ArrayList and size() returns the actual number of elements stored in the list
Question 7: Which class provides thread safe implementation of List?
ArrayList
CopyOnWriteArrayList
HashList
List
Question 8: Which of the below is not an implementation of List interface?
RoleUnresolvedList
Stack
AttibuteList
SessionList
Question 9: What is the worst case complexity of accessing an element in ArrayList?
O(n)
O(1)
O(nlogn)
O(2)
