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Interview Questions and Answers - Order By Newest

Q2971. If you are asked to develop a financial system, how would you make sure that there are proper checks , balances and audits ?

Solution

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Q2972. How can you prove your honesty ?

General

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Q2973. Which maven commands you usually work with ?

Maven

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Q2974. Design an in memory object oriented system for a Car manufacturing Company ?

Design

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Q2975. Write a method that would solve two problems at the same time ?

Core Java

Ans. We can return value for one problem solving or computation and set the value for other in some member element.

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Q2976. why is "".equals(str); safer than str.equals("")?

Core Java

Ans. str.equals("") this statement will throw NullPointerException if str is null where as "".equals(str) works fine even if str is null

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Q2977. Can we have a final argument in a method ? What is the use of that if we do so ?

Core Java

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Q2978. What is a difference between JUnit 3 and 4 ?

Junit

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Q2979. What is the minimum number of tables required to perform a SQL join?

Database

Ans. 1 , We can do self join

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Q2980. Code an elevator simulator.

Design

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Q2981. Implement a queue, using only stacks

Data Structure

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Q2982. How would you test a Twitter application ?

Testing

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Q2983. Write a calculator and find if a character appears more than n times ?

Design

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Q2984. Can we keep application configuration at different places and what could be the consideration for choosing multiple places for doing so ?

Design

Ans. Yes an application can have configuration stored at multiple places. Factors that could facilitate such a design could be

1. Type of config information - We may have a case to store confidential information differently than other regular config value

2. Environment - We may like to have a base config ( defined in application package ) and then a different override mechanism in different environments.

3. Centralization - Sometime some configs need to be shared across application and hence centralized.

4. Testing - Testing against config may not be possible in some enviornments in certain cases and hence additional config store might be kept for testing purpose only.

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Q2985. Do you think it's a good practice to keep passwords in config files ?

Solution

Ans. We can keep them in config as encrypted values.

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Q2986. How to write an iterator for an iterator of iterators?

Core Java

Ans. CustomArrayList myarrayList = new CustomArrayList();
      myarrayList.add("Value 1");
      myarrayList.add("Value 2");
      myarrayList.add("Value 3");

      for (String string : myarrayList) {
         System.out.println(string);
      }

package sample.utils;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class CustomArrayList implements Iterable {

   private ArrayList mylist = new ArrayList();

   public void add(T t) {
      this.mylist.add(t);
   }

   @Override
   public Iterator iterator() {
      return new CustomIterator(mylist);
   }

   class CustomIterator implements Iterator {

      private int indexPosition = 0;
      private List internalList;

      public CustomIterator(List internalList) {
         this.internalList = internalList;
      }

      @Override
      public boolean hasNext() {
         if (internalList.size() >= indexPosition 1) {
            return true;
         }
         return false;
      }

      @Override
      public E next() {
         E val = internalList.get(indexPosition);
         indexPosition ;
         return val;
      }

   }

}

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Q2987. What is an identity matrix ?

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Q2988. How does one do matrix multiplication?

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Q2989. What are the disadvantages of binary search trees?

Algorithm

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Q2990. Design a appointment booking system for a chain of hospitals.

Design

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Q2991. Please explain the architecture of our application through a diagram ?

General

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Q2992. How many heaps will be there with 3 threads ?

Core Java

Ans. All threads share a common heap.

Each thread has a private stack, which it can quickly add and remove items from. This makes stack based memory fast, but if you use too much stack memory, as occurs in infinite recursion, you will get a stack overflow.

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Q2993. What does 'variable hoisting' mean?

JavaScript

Ans.

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Q2994. Explain when you would decide to use open authentication ?

Authentication

Ans. Google OAuth can be used when we want to grant the access of our google credentials to the service provider ( most likely a cloud-based mobile application) by using the option ' Login via Google'

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Q2995. Why Hadoop serialized data types are not using in Spark serialization ?

BigData

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Q2996. Explain CloneNotSupportedException ?

Core Java

Ans. If we do not mention, Cloneable Interface to the Class which we want to Clone then we get this exception, only if we try to clone an object

Like:
public class TestClone{
@Override
   protected Object clone() throws CloneNotSupportedException {
      return super.clone();
   }
}

In Main, You try to do:
TestClone clone = new TestClone();

      TestClone clone2 = (TestClone) clone.clone();

You will get CloneNotSupportedException.

Just add -> public class TestClone implements Cloneable {

and things are fixed.

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Q2997. Does abstract class have public constructor?

Core Java

Ans. Yes, an abstract class can have a constructor in Java.

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Q2998. What measures would you take to avoid Java threading issues in a multi-threaded environment ?

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Q2999. Can we use Param Store with AWS Lambda ?

Amazon Web Services (AWS)

Ans. Yes

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Q3000. Is HashMap Synchronized ?

Core Java

Ans. No HashMap isn't synchronized. ConcurrentHashMap and Hashtable are synchronized.

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