Does treemap allow duplicate keys?
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Is an arraylist an object?
Provide an algorithm to reverse a linked list without using recursion.
Is null allowed in list?
How will inorder, preorder and postorder traversals print the elements of a tree?
What do you mean by sorting data?
How do you find the size of an arraylist?
Where is data structure used?
What is difference between hashmap and arraylist?
What is difference between hashmap and linkedhashmap?
What is the time complexity of arraylist and linked list?
Define a full binary tree ?
When ArrayIndexOutOfBoundsException occurs?