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Topic: Java-conceptual-questions / Level: Beginner
121. Can we override final methods in Java?
122. Can a class be final in Java?
123. What is the use of the transient keyword?
124. What is the use of the volatile keyword?
125. What is a singleton class in Java?
126. How do we create a singleton class in Java?
127. What is the use of the enum in Java?
128. What is the use of assert in Java?
129. What is Iterator in Java?
130. What is ListIterator in Java?
131. What is a Map in Java?
132. What is a Set in Java?
133. What is HashMap in Java?
134. What is TreeMap in Java?
135. What is Hashtable in Java?
136. What is the difference between HashMap and Hashtable?
137. What is the difference between Set and List in Java?
138. What is a Comparator in Java?
139. What is Comparable in Java?
140. What is the difference between Comparator and Comparable?
141. What is the hashCode() method?
142. What is the equals() method?
143. What is a TreeSet in Java?
144. What is the difference between TreeSet and HashSet?
145. What is LinkedHashSet in Java?
146. What is the difference between LinkedHashSet and HashSet?
147. What is List in Java?
148. What is the difference between ArrayList and Vector?
149. What is the difference between Iterator and ListIterator?
150. What is the purpose of the Collections class in Java?
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