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Q1. Difference between TreeMap and HashMap ?

Ans. They are different the way their elements are stored in memory. TreeMap stores the Keys in order whereas HashMap stores the key value pairs randomly.

Sample Code for treemap

Sample Code for hashmap

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Related Questions

What is comparator interface used for ?

Which of the following collections stores its elements in insertion Order ?

a. HashMap
b. TreeMap
c. LinkedHashMap
d. LinkedMap

Which are the sorted collections ?

Which of the following collection maintain its elements in Natural Sorted order ?

How can we reverse the order in the TreeMap ?

TreeMap orders the elements on which field ?

How TreeMap orders the elements if the Key is a String ?

Can we add heterogeneous elements into TreeMap ?

Will it create any problem if We add elements with key as user defined object into the TreeMap ?

Q2. Define Collection

Core Java

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Difference between HashMap and Hashtable?

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Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ?

How is Hashmap internally implemented in Java ?

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