What is difference between stack and queue?
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What will happen if an array goes out of bounds?
Define union-by-weight?
What are hashmaps good for?
Is bubble sort slow?
Are duplicates allowed in hashmap?
Is array faster than arraylist?
How would you reverse the characters of an array?
Can we insert null in set?
Explain about the different lists available in the collection?
Define graph?
Can we change load factor of hashmap?
What are the major data structures used in the following areas : network data model & hierarchical data model?