Collections Framework In Java — Part 2 MCQs with Explanations

BlockingEnque is the correct answer to “Which of the below is not a subinterface of Queue”. This question is standard in competitive examination syllabi for Collections Framework In Java.

Collections.sort(listObj) is the correct answer to “How to sort elements of ArrayList”. This question is standard in competitive examination syllabi for Collections Framework In Java.

java.util is the correct answer to “Which of these packages contain all the collection classes”. This question is standard in competitive examination syllabi for Collections Framework In Java.

keySet() is the correct answer to “Which of these methods can be used to obtain set of all keys in a map”. This question is standard in competitive examination syllabi for Collections Framework In Java.

None of the mentioned is the correct answer to “Which of these methods are member of Remote class”. This question is standard in competitive examination syllabi for Collections Framework In Java.

get() is the correct answer to “Which of these method Map class is used to obtain an element in the map having specified key”. This question is standard in competitive examination syllabi for Collections Framework In Java.

elementCount is the correct answer to “What is the name of a data member of class Vector which is used to store a number of elements in the vector”. This question is standard in competitive examination syllabi for Collections Framework In Java.

Prints Present Time & Date is the correct answer to “What will be the output of the following Java code? import java.util.*; class date { public static void main(String args[]) { Date obj = new Date(); System.out.print(obj); } }”. This question is standard in competitive examination syllabi for Collections Framework In Java.

O(1) is the correct answer to “What is the worst case complexity of accessing an element in ArrayList”. This question is standard in competitive examination syllabi for Collections Framework In Java.

Compilation Error is the correct answer to “What is the length of the application box made in the following Java program? import java.awt.*; import java.applet.*; public class myapplet extends Applet { Graphic g; g.drawString("A Simple Applet",20,20); }”. This question is standard in competitive examination syllabi for Collections Framework In Java.

The bucket will switch from LinkedList to BalancedTree is the correct answer to “If large number of items are stored in hash bucket, what happens to the internal structure”. This question is standard in competitive examination syllabi for Collections Framework In Java.

ArrayList is the correct answer to “Which of these standard collection classes implements a dynamic array”. This question is standard in competitive examination syllabi for Collections Framework In Java.

Shallow clone is the correct answer to “What is the default clone of HashSet”. This question is standard in competitive examination syllabi for Collections Framework In Java.

enqueue and dequeue is the correct answer to “What is the correct method used to insert and delete items from the queue”. This question is standard in competitive examination syllabi for Collections Framework In Java.

Array is the correct answer to “Which of these standard collection classes implements all the standard functions on list data structure”. This question is standard in competitive examination syllabi for Collections Framework In Java.

ConcurrentModificationException is thrown is the correct answer to “What happens if two threads simultaneously modify TreeSet”. This question is standard in competitive examination syllabi for Collections Framework In Java.

Integer.MAX_VALUE is the correct answer to “What is the remaining capacity of BlockingQueue whose intrinsic capacity is not defined”. This question is standard in competitive examination syllabi for Collections Framework In Java.

Test - 10 Test - 10 is the correct answer to “What will be the output of the following Java code snippet? public class Test { public static void main(String[] args) { Set s = new HashSet(); s.add(new Long(10)); s.add(new Integer(10)); for(Object object : s) { System.out.println("test - "+object); } } }”. This question is standard in competitive examination syllabi for Collections Framework In Java.

Tail of list is the correct answer to “Where does a new element be inserted in linked list implementation of a queue”. This question is standard in competitive examination syllabi for Collections Framework In Java.

CopyOnWriteArrayList is the correct answer to “Which class provides thread safe implementation of List”. This question is standard in competitive examination syllabi for Collections Framework In Java.

Enumeration is the correct answer to “Which of these is the interface of legacy”. This question is standard in competitive examination syllabi for Collections Framework In Java.

2 is the correct answer to “While finding the correct location for saving key value pair, how many times the key is hashed”. This question is standard in competitive examination syllabi for Collections Framework In Java.

java.text is the correct answer to “Which of these package is used for all the text related modifications”. This question is standard in competitive examination syllabi for Collections Framework In Java.

Collection is the correct answer to “Which of these is a Basic interface that all other interface inherits”. This question is standard in competitive examination syllabi for Collections Framework In Java.

false is the correct answer to “What will be the output of the following Java code? import java.util.*; class hashtable { public static void main(String args[]) { Hashtable obj = new Hashtable(); obj.put("A", new Integer(3)); obj.put("B", new Integer(2)); obj.put("C", new Integer(8)); System.out.print(obj.contains(new Integer(5))); } }”. This question is standard in competitive examination syllabi for Collections Framework In Java.

SessionList is the correct answer to “Which of the below is not an implementation of List interface”. This question is standard in competitive examination syllabi for Collections Framework In Java.

previousIndex() is the correct answer to “Which of these is a method of ListIterator used to obtain index of previous element”. This question is standard in competitive examination syllabi for Collections Framework In Java.

[A, D, B, C] is the correct answer to “What will be the output of the following Java program? import java.util.*; class Arraylist { public static void main(String args[]) { ArrayList obj = new ArrayList(); obj.add("A"); obj.add("B"); obj.add("C"); obj.add(1, "D"); System.out.println(obj); } }”. This question is standard in competitive examination syllabi for Collections Framework In Java.

[A=1, B=2, C=3] is the correct answer to “What will be the output of the following Java program? import java.util.*; class Maps { public static void main(String args[]) { TreeMap obj = new TreeMap(); obj.put("A", new Integer(1)); obj.put("B", new Integer(2)); obj.put("C", new Integer(3)); System.out.println(obj.entrySet()); } }”. This question is standard in competitive examination syllabi for Collections Framework In Java.

length() is the correct answer to “Which of these method is used to calculate number of bits required to hold the BitSet object”. This question is standard in competitive examination syllabi for Collections Framework In Java.

RemoteException is the correct answer to “Which of these Exceptions is thrown by remote method”. This question is standard in competitive examination syllabi for Collections Framework In Java.

True is the correct answer to “When an array is passed to a method, will the content of the array undergo changes with the actions carried within the function”. This question is standard in competitive examination syllabi for Collections Framework In Java.

Bitset is the correct answer to “Which of these class object has an architecture similar to that of array”. This question is standard in competitive examination syllabi for Collections Framework In Java.

sort() is the correct answer to “Which of these method of Array class is used sort an array or its subset”. This question is standard in competitive examination syllabi for Collections Framework In Java.

Map is the correct answer to “Which of these is the interface of legacy is implemented by Hashtable and Dictionary classes”. This question is standard in competitive examination syllabi for Collections Framework In Java.

AddClient.java is the correct answer to “Which of these class is used for creating a client for a server-client operations”. This question is standard in competitive examination syllabi for Collections Framework In Java.

12345 is the correct answer to “What will be the output of the following Java program? import java.util.*; class Array { public static void main(String args[]) { int array[] = new int [5]; for (int i = 5; i > 0; i--) array[5 - i] = i; Arrays.sort(array); for (int i = 0; i < 5; ++i) System.out.print(array[i]);; } }”. This question is standard in competitive examination syllabi for Collections Framework In Java.

It maintains the insertion order and guarantees uniqueness is the correct answer to “What is the unique feature of LinkedHashSet”. This question is standard in competitive examination syllabi for Collections Framework In Java.

true is the correct answer to “What will be the output of the following Java program? import java.util.*; class Arraylist { public static void main(String args[]) { ArrayList obj1 = new ArrayList(); ArrayList obj2 = new ArrayList(); obj1.add("A"); obj1.add("B"); obj2.add("A"); obj2.add(1, "B"); System.out.println(obj1.equals(obj2)); } }”. This question is standard in competitive examination syllabi for Collections Framework In Java.

All of the mentioned is the correct answer to “Which of these class object uses the key to store value”. This question is standard in competitive examination syllabi for Collections Framework In Java.