If you have large file how would you find word with most frequency.

1) Tell me about yourself 2) Current roles and responsibility in current project 3) Which type of client requirement you are working and how it is. 4) basis diff bet hashset and treeset 5) how hash set internally implemented 6) How hash map is getting used 7) What is use of concurent hash map 8) Diff bet synchronsized hasmap and concurrent hashmap 9) Exception handling - how to create custom exception. And how to throw that 10) What is throwable 11) What if we have removed catch bloack and kept try and finally, how excepion will get handled 12) try with finally is allowed? 13) Immutable concept in java 14) have one class i have employee class 1) name 2)list of degree if i have to make call immutble what i have to do? 15) How to create Immutable class 16) what is different way to create a String 17) what is different between string pool and heap. 18)diff bet array list and Linked list and in term of delete which is better option 19) Singlton concept in java 20)Diff bet wait and sleep method os sleep. 21) what is runnable and callable in java 22) i have 3 thread t1,t2 and t3, now i want to make sure want to run this thread run sequentially, like first t1, then t2 and at last t3, this should be sequentially 23) Have you used executor framework in java multithreading. 24) Concept of dependency injection in spring 25) What are annotation in @sprngBootAppplicaton 26) what is @component annotaion 27) diff bet comparable and comparator 28) Write a code to find for Uppercase leter there is lower case preset or not. input==String str= "AjUYsyuaaZ"; Outout== A,U,Y 29) Write code to find pair of 2 element where the value will be eqeual to sum int [] intArray = {4,6,2,3,8,1,9,5}; int sum = 7;