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Questions and Answers
What is an array?
What is an array?
- A collection of items stored in non-contiguous memory locations
- A collection of items stored in random memory locations
- A collection of items stored in contiguous memory locations (correct)
- A collection of items stored in a database
Which class is part of the collection framework and provides dynamic arrays in Java?
Which class is part of the collection framework and provides dynamic arrays in Java?
- HashSet
- LinkedList
- TreeMap
- ArrayList (correct)
Which data structure is preferred for dynamicity and ease of insertions and deletions?
Which data structure is preferred for dynamicity and ease of insertions and deletions?
- Array
- LinkedList (correct)
- Stack
- ArrayList
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Study Notes
- An array is a collection of items stored in contiguous memory locations
- ArrayList and LinkedList are classes implemented to solve the limitation of the array's fixed size
- ArrayList is part of the collection framework and provides dynamic arrays in Java
- LinkedList is a linear data structure where elements are linked using pointers and addresses
- ArrayList has fast indexed access time but can be slow when inserting or deleting elements from the middle
- LinkedList does not use an array to store its elements and is preferred for dynamicity and ease of insertions and deletions
- Each element in a LinkedList is represented by a node that contains a reference to the data stored in the node and a reference to the next node in the list
- Retrieving elements from an ArrayList by an index is very quick
- Inserting or deleting elements from the middle of an ArrayList can be slow as the entire array needs to be shifted in memory
- Each element in a LinkedList is a separate object with a data part and an address part
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