How do you sort an arraylist in descending order?
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Differentiate between hashset and hashmap.
What is non linear structure?
Name few collections map implementations?
How can I study data structures and algorithms?
Tell me why might quick sort might be better than merge sort?
Which of the collections allows null as the key?
What are the different types of data structures explain briefly?
What is a node in it?
What is a priority queue?
Does treemap allow null key?
Is an arraylist a vector?
Discuss how to implement queue using stack.