Define a stack?
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Name few concurrent collection classes?
Which is faster list or set?
Which is better arraylist or linkedlist?
What data type is array?
How helpful is abstract data type of data structures?
What is a matrix? Explain its uses with an example
How do you initialize an arraylist?
Parenthesis are never needed in prefix or postfix expressions. Why?
Can hashtable have duplicate values?
What is a treemap chart?
Which collection allows null values?
How do you find the length of an arraylist?