Look Who it Was Random video

Java Interview Question 45 Collection Java Interview Questions

2,720 views · Published 26 October 2013 · 2:10 · Indexed 23 October 2026

Channel: Interview DOT · 2013 · Science & Technology

Watch on YouTube

Click here - https://www.youtube.com/channel/UCd0U_xlQxdZynq09knDszXA?sub_confirmation=1 to get notifications. Java Interview Question 45 Collection Java Interview Questions
Core Java Collections Interview Questions ? Java Interview Questions 

1.What is Java Collections Framework ? List out some benefits of Collections framework ?
2.What is the benefit of Generics in Collections Framework ?
3.What are the basic interfaces of Java Collections Framework ?
4.Why Collection doesn't extend Cloneable and Serializable interfaces ?
5.Why Map interface doesn't extend Collection interface ?
6.What is an Iterator ?
7.What is difference between Enumeration and Iterator interface ?
8.Why there is not method like Iterator.add() to add elements to the collection ?
9.Why Iterator don't have a method to get next element directly without moving the cursor ?
10.What is different between Iterator and ListIterator ?
11.What are different ways to iterate over a list ?
12.What do you understand by iterator fail-fast property ?
13.What is difference between fail-fast and fail-safe ?
14.How to avoid ConcurrentModificationException while iterating a collection ?
15.Why there are no concrete implementations of Iterator interface ? 
16.What is UnsupportedOperationException ?
17.How HashMap works in Java ?
18.What is the importance of hashCode() and equals() methods ?
19.Can we use any class as Map key ?
20.What are different Collection views provided by Map interface ?
21.What is difference between HashMap and Hashtable ?
22.How to decide between HashMap and TreeMap ?
23.What are similarities and difference between ArrayList and Vector ?
24.What is difference between Array and ArrayList ? When will you use Array over ArrayList ?
25.What is difference between ArrayList and LinkedList ?
26.Which collection classes provide random access of it's elements ?
27.What is EnumSet ?
28.Which collection classes are thread-safe ?
29.What are concurrent Collection Classes ?
30.What is BlockingQueue ?
31.What is Queue and Stack, list their differences ?
32.What is Collections Class ?
33.What is Comparable and Comparator interface ?
34.What is difference between Comparable and Comparator interface ?
35.How can we sort a list of Objects ?
36.While passing a Collection as argument to a function, how can we make sure the function will not be able to modify it ?
37.How can we create a synchronized collection from given collection ?
38.What are common algorithms implemented in Collections Framework ?
39.What is Big-O notation? Give some examples ?
40.What are best practices related to Java Collections Framework ?
41.Difference between ConcurrentHashMap and Collections.synchronizedMap and Hashtable in Java ?
42.How can Arraylist be synchronized without using Vector ?
43.Which all classes implement Set interface ?
44.Which design pattern Iterator follows ?
45.What is the Collection interface ? 
A Job Portal
http://www.InterviewDot.com http://www.InterviewDot.com http://www.InterviewDot.com
One Click Dream Job - http://www.interviewdot.com/upload-resume/uploadresume.htm

Other Top Job Portals
www.Naukri.com
www.MonsterIndia.com
www.TimesJobs.com

Are you looking for a new Job ?
InterviewDot.com - A Job Portal
http://www.InterviewDot.com http://www.InterviewDot.com http://www.InterviewDot.com
One Click Dream Job - http://www.interviewdot.com/upload-resume/uploadresume.htm

More from this channel