Describe tree database.
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Name few classes that implement collection interface?
What you mean by sorting?
What is a dequeue?
What is a postfix expression?
Differentiate between compilers and interpreters.
How many types of data structures are used?
Is duplicate allowed in hashmap?
What is hashing technique?
How to traverse data in a linked list in forward and backward direction, write the algorithm?
What is linked hash set?
Discuss how to implement queue using stack.
Does treemap allow null keys?