Interview Questions and Answers - Basic Level | Search Interview Question

Interview Questions and Answers - Order By Newest

Q71. How can we make sure that a code segment gets executed even in case of uncatched exceptions ?

Ans. By putting it within finally.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java oops exceptions finally uncatched exceptions basic frequent}

Q72. What is "super" used for ?

Ans. Used to access members of the base class.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java oops java keywords super basic interview question Asked in 2 Companies basic frequent}

Q73. What is "this" keyword used for ?

Ans. Used to represent an instance of the class in which it appears.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java oops java keywords this basic interview question basic frequent}

Q74. Difference between boolean and Boolean ?

Core Java

Ans. boolean is a primitive type whereas Boolean is a class.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java oops wrapper classes boolean vs Boolean basic rare}

Q75. Difference between Serialization and Deserialization ?

Core Java

Ans. Serialization is the process of writing the state of an object to a byte stream. Deserialization is the process of restoring these objects.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java oops serialization deserialization serialization vs deserialization Asked in 2 Companies basic frequent}

Try 1 Question(s) Test

Q76. What is an Enum type ?

Core Java

Ans. An enum type is a special data type that enables for a variable to be a set of predefined constants

Sample Code for enum

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java java5 enum basic interview question basic frequent}

Try 2 Question(s) Test

Q77. What is a Static import ?

Core Java

Ans. By static import , we can access the static members of a class directly without prefixing it with the class name.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java java5 static import static java keyword static import Asked in 4 Companies basic frequent}

Q78. Difference between Map and HashMap ?

Core Java

Ans. Map is an interface where HashMap is the concrete class.

Sample Code for map

Sample Code for hashmap

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java collections hashmap map basic frequent}

Frequently asked to fresh graduates.

Q79. Is JVM, a compiler or interpretor ?

Ans. Its an interpretor.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java jvm compiler interpretor basic frequent}

Q80. Is it necessary that each try block to be followed by catch block ?

Core Java

Ans. It should be followed by either catch or finally block.

Sample Code for Retry in case of exception

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java exceptions exception handling try catch finally Oracle OCA Test Asked in 3 Companies basic frequent}

Try 1 Question(s) Test

Q81. Difference between nested and inner classes ?

Ans. Inner class is a type of nested class.

Inner classes are non static nested classes i.e the one that are associated with the instance of outer class.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java oops static nested classes inner classes nested vs inner class basic frequent}

Try 1 Question(s) Test

Q82. what is the difference between collections class vs collections interface ?

Core Java

Ans. Collections class is a utility class having static methods for doing operations on objects of classes which implement the Collection interface. For example, Collections has methods for finding the max element in a Collection.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java collections collections class collection interface basic interview question Asked in 6 Companies basic frequent}

Try 1 Question(s) Test

Q83. What is XML ?

Xml

Ans. XML or eXtensible Markup Language is a markup languages for describing data and its metadata.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve xml markup language basic frequent}

Frequently asked in CTS ( Based on 2 feedback )

Q84. What is the difference between comparable and comparator in java.util pkg?

Core Java

Ans. Comparable interface is used for single sequence sorting i.e.sorting the objects based on single data member where as comparator interface is used to sort the object based on multiple data members.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java java.util comparable comparator collections Asked in 23 Companies basic frequent}

Q85. Advantage of Collection classes over Arrays ?

Core Java

Ans. Collections are re-sizable in nature. We can increase or decrease the size as per recruitment.
Collections can hold both homogeneous and heterogeneous data's.
Every collection follows some standard data structures.
Collection provides many useful built in methods for traversing,sorting and search.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java collections collections classes advantages of collections over arrays collections vs arrays basic interview question Asked in 6 Companies basic frequent}

Q86. What is the difference between float and double?

Ans. Float can represent up to 7 digits accurately after decimal point, where as double can represent up to 15 digits accurately after decimal point.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java data types float double difference between basic interview question}

Q87. What are the features of encapsulation ?

Core Java

Ans. Combine the data of our application and its manipulation at one place.

Encapsulation Allow the state of an object to be accessed and modified through behaviors.

Reduce the coupling of modules and increase the cohesion inside them.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java oops oops concepts encapsulation object oriented programming (oops) oops concepts basic interview question Asked in 2 Companies basic frequent}

Q88. Write a method to check if input String is Palindrome?

Core Java

Ans. private static boolean isPalindrome(String str) {

if (str == null)
return false;

StringBuilder strBuilder = new StringBuilder(str);

strBuilder.reverse();

return strBuilder.toString().equals(str);

}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java string stringbuilder stringbuilder string class code palindrome Asked in 38 Companies Basic frequent}

Q89. Write a Program to check if 2 strings are Anagrams ?

Core Java

Ans. public void checkIfAnagram(String str1,String str2){
boolean anagram = true;
for(char c:str1.toCharArray()){
if(!str2.contains(String.valueOf(c))){
System.out.println("Strings are Anagrams");
anagram = false;
}

if(anagram == true){
System.out.println("Strings are not Anagrams");
}
}
}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve check if 2 strings are Anagrams Asked in 30 Companies basic frequent}

Q90. Difference between ArrayList and LinkedList ?

Ans. LinkedList and ArrayList are two different implementations of the List interface. LinkedList implements it with a doubly-linked list. ArrayList implements it with a dynamically resizing array.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java collections list arraylist linkedlist difference between basic frequent}

Q91. Which are the sorted collections ?

Core Java

Ans. TreeSet and TreeMap

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java collections treemap treeset basic interview question basic frequent}

Very frequently asked if being interviewed for hibernate. Frequently asked in Tata Consultancy (TCS) and Overstock.com

Q92. Difference between load and get ?

Hibernate

Ans. If id doesnt exist in the DB load throws an exception whereas get returns null in that case.get makes the call to DB immediately whereas load makes the call to proxy.

Help us improve. Please let us know the company, where you were asked this question :

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

Q93. When does an application throw NullPointerException ?

Core Java

Ans. When it tries to access an object element or method using reference which is actually null.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve exceptions npe nullpointerexception Asked in 1 Companies basic frequent}

Q94. How is Abstraction implemented in Java ?

Core Java

Ans. Abstraction is provided in Java by following ways -

Coding to the ( Interfaces / Abstract Classes ) or contracts

By Encapsulating details within classes and exposing the minimal Door ( few public methods )

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java oops concepts abstraction interfaces abstract class encapsulation object oriented programming (oops) oops concepts Asked in 3 Companies basic frequent}

Q95. Difference between jar , war and ear ?

Java EE

Ans. Jar is Java Archieve i.e compressed Class or Class / Java files.

War comprises of compressed Servlet class files,JSP FIles,supporting files, GIF and HTML files.

Ear comprise of compressed Java and web module files ( was files ).

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java j2ee jar web development war ear build management release management Asked in 12 Companies basic frequent}

Q96. Which java frameworks have you used ?

General

Ans. I have primarily worked on Web applications and hence worked on Struts , Spring , Hibernate, JSF ( Java Server Faces ) , Velocity etc.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve elsevier frameworks java frameworks general question Asked in 3 Companies basic frequent}

Q97. How are values passed in Java ? By value or reference ?

Core Java

Ans. Java only provides pass by value.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve ebay pass by value pass by reference method call methods functions function call Asked in 10 Companies basic frequent}

Q98. What is a package and what are its advantages ?

Core Java

Ans. Package is a namespace that organizes a set of related classes.

Advantages of Packages

1. Better Organization of classes.
2. Saves from the problem of duplicate names as duplicate class names are allowed across different packages.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve package advantages of packages Asked in 1 Companies Basic}

Q99. What is a Database Trigger ?

Database

Ans. A trigger is a special kind of stored procedure that automatically gets executed upon an event in the database server.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve database trigger Asked in 10 Companies basic frequent}

Q100. What is a self Join and give an example of a self Join ?

or

What is self Join and What is it's purpose ?

Database

Ans. When a Table Join itself , it's a Self Join. For example - we like to know the pair of department names where first dept has lesser employees than the later.

Select D1.name , D2.name from Dept D1, Dept D2 where D1.employee_count < D2.employee_count

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve sql joins self join self-join Pair of employee names with first having lesser salary than later Pair of department names where first dept has lesser employees than the later Asked in 26 Companies basic frequent}

Search Interview Questions

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.