Interview Questions and Answers for 'Deloitte' | Search Interview Question

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Very frequently asked.

Q31. What is the use of synchronized keyword ?

Ans. Synchronize is used to achieve mutual exclusion i.e at one time, the segment of the code, method that has been declared synchronized should be executed by single thread only and hence the lock needs to be retrieved before executing the segment and then released.

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_{Like Discuss Correct / Improve threads multithreading synchronized Asked in 5 Companies basic frequent}

Q32. What is an exception and exception handling in Java ?

Core Java

Ans. An Exception in java is the occurrence during computation that is anomalous and is not expected.

Exception handling is the mechanism which is used to handle such situations.

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_{Like Discuss Correct / Improve exception handling Asked in 18 Companies basic frequent}

Q33. Write an algorithm / java program for Heap Sort ?

Algorithm

Ans. https://www.geeksforgeeks.org/heap-sort/

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_{Like Discuss Correct / Improve sorting heap sort Asked in 1 Companies frequent}

Frequently asked Spring interview question.

Q34. What are the components of Spring framework ?

Spring

Ans. Core: [Core, Bean, Context, Expression Language]

Web: [Web, Portlet, Servlet, etc]

Data Access [JMS, JDBC, etc]

AOP, Aspect

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_{Like Discuss Correct / Improve spring spring framework components Asked in 12 Companies}

Q35. Is HttpServlet an abstract class ?

Java EE

Ans. Yes

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Q36. Create a stack of specific size using arrayList?

Data Structure

Ans. public class StackUsingArrayList {
   public static void main(String[] args) {
      List list = new ArrayList();
      list.add("A");
      list.add("B");
      list.add("C");

      Stack stack = new Stack();

      list.forEach(a -> stack.add(a));
      System.out.println(stack);

   }
}

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Q37. Write code to sort an array.

Algorithm

Ans. https://www.geeksforgeeks.org/arrays-sort-in-java-with-examples/

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_{Like Discuss Correct / Improve array sorting Asked in 16 Companies basic frequent}

Q38. What is the difference between abstraction and abstract class ?

Core Java

Ans. Abstract class is one of the facility for achieving abstraction in Java.

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Q39. Write code to print a Pyramid pattern ?

Core Java

Ans. public static void printTriagle(int n)
{
// outer loop to handle number of rows
// n in this case
for (int i=0; i1; j--)
{
// printing spaces
System.out.print(" ");
}

// inner loop to handle number of columns
// values changing acc. to outer loop
for (int j=0; j<=i; j )
{
// printing stars
System.out.print("* ");
}

// ending line after each row
System.out.println();
}
}

// Driver Function
public static void main(String args[])
{
int n = 5;
printTriagle(n);
}

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Q40. If your application has multiple databases, how many changes you have to made in Hibernate?

Hibernate

Ans. If you have mulitple Databases you just need to add multiple configuration files and create the corresponding SessionFactory object.

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Q41. If SOAP is more secure than Rest, Why many applications today use Rest ?

Web Service

Ans. SOAP supports only xml whereas Rest support many other formats.

Rest services are very light weight compared to SOAP.

SOAP services are code heavy as they require creation. of stubs and skeltons.

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_{Like Discuss Correct / Improve soap rest soap vs rest Asked in 2 Companies}

Q42. What are different types of IOC containers ?

Design

Ans. J2ee Web Containers and Core Containers

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Q43. How to sort objects based on one of the field ?

Core Java

Ans. Using comparable and comparator and sorted collections like TreeSet or TreeMap.

or

use stream api from java 8 onwards which internally refers to comparable and comparator through lambda expressions

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_{Like Discuss Correct / Improve sort sorting comprator comparable treeset treemap sorting collections Asked in 1 Companies Basic frequent}

Q44. Given an Employee Table with Salary Column, Find 2nd and 5th highest salary in a particular department.

SQL

Ans. Select salary from (select salary from employee where department = order by salary desc limit 5) emp order by salary limit 1 AND Select salary from (select salary from employee where department = order by salary desc limit 2) emp2 order by salary limit 1

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Q45. Difference between Component-Scan and @Component annotation ?

Spring

Ans. @component mark a java class as a bean so that component scan mechanism of spring pick it up and register in IOC container.

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Q46. Sort an Employee Object based on Name or Age

Database

Ans. Use Comparable or Comparator interface

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Q47. What is the main difference between unique key and primary key ?

Database

Ans. Primary key will not accept NULL values whereas Unique key can accept one NULL value.

A table can have only primary key whereas there can be multiple unique key on a table.

A Clustered index automatically created when a primary key is defined whereas Unique key generates the non-clustered index.

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_{Like Discuss Correct / Improve Unique Key Primary Key Asked in 1 Companies}

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