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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

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

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

What is comparator interface used for ?

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

Which are the sorted collections ?

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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Does garbage collection guarantee that a program will not run out of memory?

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Describe, in general, how java's garbage collector works ?

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Difference between TreeMap and HashMap ?

Can you provide some implementation of a Dictionary having large number of words ?

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

Let's suppose we have an to destroy objects, Design a program to implement garbage collection ?

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