Objects and Collections Questions and Answers
Java Objects and Collections programming questions and answers are essential for mastering object-oriented design and data structure handling. These questions often appear in coding interviews by Infosys, TCS, and Accenture. The topic covers object creation, reference handling, garbage collection, and the use of Java Collection Framework classes like List, Set, and Map. Understanding how to manage and iterate over collections efficiently helps in building optimized programs. Practicing programming questions and answers in this area enhances both logic and coding speed—crucial skills for clearing technical interview rounds and online assessments.
Objects and Collections
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38 questions
22. Which collection class maintains insertion order?
- HashSet
- TreeSet
- LinkedHashSet
- PriorityQueue
24. Which reference indicates an object is not pointing anywhere?
- void
- delete
- null
- none
26. Which class stores elements in sorted order?
- TreeSet
- HashSet
- ArrayList
- Vector
27. Which method removes all elements from a collection?
- clear()
- delete()
- removeAll()
- empty()
28. Which concept allows objects to take many forms?
- Abstraction
- Encapsulation
- Polymorphism
- Inheritance