Java Collections Interview Questions and Answers - New Version

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03 Dec 2019

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Questions
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134 . Why do we need collections in Java?
135 . What are the important interfaces in the collection hierarchy?
136 . What are the important methods that are declared in the collection interface?
137 . Can you explain briefly about the List interface?
138 . Explain about ArrayList with an example?
139 . Can an ArrayList have duplicate elements?
140 . How do you iterate around an ArrayList using iterator?
141 . How do you sort an ArrayList?
142 . How do you sort elements in an ArrayList using comparable interface?
143 . How do you sort elements in an ArrayList using comparator interface?
144 . What is vector class? How is it different from an ArrayList?
145 . What is linkedList? What interfaces does it implement? How is it different from an ArrayList?
146 . Can you briefly explain about the Set interface?
147 . What are the important interfaces related to the Set interface?
148 . What is the difference between Set and sortedSet interfaces?
149 . Can you give examples of classes that implement the Set interface?
150 . What is a HashSet?
151 . What is a linkedHashSet? How is different from a HashSet?
152 . What is a TreeSet? How is different from a HashSet?
153 . Can you give examples of implementations of navigableSet?
154 . Explain briefly about Queue interface?
155 . What are the important interfaces related to the Queue interface?
156 . Explain about the Deque interface?
157 . Explain the BlockingQueue interface?
158 . What is a priorityQueue?
159 . Can you give example implementations of the BlockingQueue interface?
160 . Can you briefly explain about the Map interface?
161 . What is difference between Map and sortedMap?
162 . What is a HashMap?
163 . What are the different methods in a Hash Map?
164 . What is a TreeMap? How is different from a HashMap?
165 . Can you give an example of implementation of navigableMap interface?
166 . What are the static methods present in the collections class?

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