Define secondary clustering?
What is difference between array and arraylist?
How many null values are allowed in hashmap?
Explain Linked List
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What exactly is a thread?
What are the Differences between map and hashmap?
Define the graph data structure?
Can you have an arraylist of arrays?
Write the importance of hashing?
How will you check the validity of an expression containing nested parentheses?
Is arraylist a list?
How do you define a set?