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Q751. Sort a List of Objects using comparable and comparator

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Q752. What can we do if we need to retrieve Fibonacci value at a particular index faster ? Can we use Linked List ?

Data Structure

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Q753. What are the drawbacks of Reactive extensions ?

ReactiveX

Ans. Reactive extensions have a steep learning curve which makes it confusing for beginner and intermediate developers.

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Q754. Have you heard of reactive extensions ?

ReactiveX

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Q755. What is the difference between subject and observable ?

RxJava

Ans. Subject has state, it keeps a list of observers. On the other hand, an Observable is really just a function that sets up observation. While Subjects are Observables, Subjects also implement an Observer interface.

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Q756. What is the difference between Observer and Observable ?

RxJava

Ans. Observable is emiting data and Observer is subscribing to catch the data

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Q757. What are Ractive Streams ?

ReactiveX

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Q758. What is the difference between Observer and Subscriber ?

Design

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Q759. Which data structure would you use to implement LRU cache and Why ? Can you tell me the time complexity for it ?

Algorithm

Ans. We can use LinkedHashMap as it will give time complexity of O(1) for lookup and We can maintain the insertion order to identify the Last used elements for eviction.

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Q760. What is the difference between time and space complexity ?

Algorithm

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Q761. Given a list of People, We need to distribute their gifts in such a way that

Any Person shouldn't get it's gift back
If A's gift goes to B, B's gift shouldn't go to A

Write a method that returns a Map where Key is the Person's name and value is the name of person whose gift was exchanged.

Design

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Q762. Write a method that takes a string as input and identifies if any permutation of the String is Palindrome ? For example - ttoobb has a permutation 'bottob' which is a palindrome.

Design

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Q763. Difference between Left and Inner Join ?

SQL

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Q764. Given a sorted array, write an algorithm to create a binary tree.

Algorithm

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Q765. Write a method that returns maximum depth of a tree ?

Algorithm

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Q766. What is the difference between pop and peek function of stack ?

Data Structure

Ans. pop method pulls the top element from the stack and then move the top to the next element whereas peek only get the top element but doesn't move the top.

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Q767. Write a program to sort a stack in ascending order You should not make any assumptions about how the stack is implemented The following are the only functions that should be used to write this program: push | pop | peek | isEmpty

Algorithm

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Q768. How would you design a stack which, in addition to push and pop, also has a function min which returns the minimum element? Push, pop and min should all operate in O(1) time

Algorithm

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Q769. Describe how you could use a single array to implement three stacks

Algorithm

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Q770. Write a Program to implement stack using LinkedList.

Data Structure

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Q771. Design an algorithm and write code to remove the duplicate characters in a string without using any additional buffer.

Algorithm

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Q772. What is the runtime complexity of appending strings to string object and Why ?

Algorithm

Ans. O(n^2) because each time a string is appended a new String is created and it runs through all the letters to copy them over.

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Q773. What is the access time for ArrayList and LinkedList ?

Data Structure

Ans. O(1) for ArrayList
O(n) for LinkedList

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Q774. Write code to see if a Linked List has cycle in it ?

or

Write code using Floyd Algorithm to see if a linked list has cycle in it ? What is it's comlexity ?

Algorithm

Ans. public class LinkedList {

Node start = null;
Node head = null;

class Node {
Integer body;
Node nextNode;

Node(Integer value) {
body = value;
}
}

public static void main(String[] args) {
LinkedList ll = new LinkedList();

ll.addNodeToEnd(5);
ll.addNodeToEnd(10);
ll.addNodeToEnd(15);

ll.traverse();

if(checkIfLoop(l1)){
System.out.println("There is a Loop");
} else {
System.out.println("No Loop");
}
}

private boolean checkifLoop(Test l1) {
Node slow = start;
Node fast = start;
Node faster = start;

while(slow != null ) {
fast = slow.nextNode;
faster = fast.nextNode;
if(slow == fast || slow == faster) {
return true;
}
slow = slow.nextNode;
}

return false;
}

}

Complexity of this algorithm is O(n)

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Q775. How long will it take for you to join Canopy ?

General

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Q776. Have you worked with JSF ?

General

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Q777. Explain your experience working on UI ?

General

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Q778. Why you chose programming as your career ?

General

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Q779. What methodology and technology stack do you use ?

General

Ans. [Open Ended Answer]

Possible Answer - We are using Agile. We have daily standups, Bi weekly Backlog Grooming , Planning and Retrospective, We have a 2 week sprint and We use Jira for Scrum Management. We are using Java 8, Spring Boot, JSF , Apache Kafka , Soap as well as Rest Services.

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Q780. Are you involved in getting business requirements ?

General

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