Java Programming Interview Guide : 200+ Questions & Answers (Udemy.com)

How about Quickly Revising all the Important Java Concepts in about 6 Hours before an interview?

Preparing for Java Interview is tricky. You would need to get a good understanding of new features and revise concepts you used in your preparation. This course helps you Prepare for Java Interview with hands-on code examples covering 200+ Java Interview Questions and Answers on varied range of topics listed below. 

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COURSE HIGHLIGHTS:

Java Platform

• 1 . Why is Java so popular?

• 2 . What is platform independence?

• 3 . What is bytecode?

• 4 . Compare JDK vs JVM vs JRE 

• 5 . What are the important differences between C++ and Java?

• 6 . What is the role for a classloader in Java?

Wrapper Classes

• 7 . What are Wrapper classes?

• 8 . Why do we need Wrapper classes in Java?

• 9 . What are the different ways of creating Wrapper class instances?

• 10 . What are differences in the two ways of creating Wrapper classes?

• 11 . What is auto boxing?

• 12 . What are the advantages of auto boxing?

• 13 . What is casting?

• 14 . What is implicit casting?

• 15 . What is explicit casting?

Strings

• 16 . Are all String’s immutable?

• 17 . Where are String values stored in memory?

• 18 . Why should you be careful about String concatenation(+) operator in loops?

• 19 . How do you solve above problem?

• 20 . What are differences between String and StringBuffer?

• 21 . What are differences between StringBuilder and StringBuffer?

• 22 . Can you give examples of different utility methods in String class?

Object oriented programming basics

• 23 . What is a class?

• 24 . What is an object?

• 25 . What is state of an object?

• 26 . What is behavior of an object?

• 27 . What is the super class of every class in Java?

• 28 . Explain about toString method ?

• 29 . What is the use of equals method in Java?

• 30 . What are the important things to consider when implementing equals method?

• 31 . What is the Hashcode method used for in Java?

• 32 . Explain inheritance with examples . 

• 33 . What is method overloading?

• 34 . What is method overriding?

• 35 . Can super class reference variable can hold an object of sub class?

• 36 . Is multiple inheritance allowed in Java?

• 37 . What is an interface?

• 38 . How do you define an interface?

• 39 . How do you implement an interface?

• 40 . Can you explain a few tricky things about interfaces?

• 41 . Can you extend an interface?

• 42 . Can a class extend multiple interfaces?

• 43 . What is an abstract class?

• 44 . When do you use an abstract class?

• 45 . How do you define an abstract method?

• 46 . Compare abstract class vs interface?

• 47 . What is a constructor?

• 48 . What is a default constructor?

• 49 . Will this code compile?

• 50 . How do you call a super class constructor from a constructor?

• 51 . Will this code compile?

• 52 . What is the use of this()?

• 53 . Can a constructor be called directly from a method?

• 54 . Is a super class constructor called even when there is no explicit call from a sub class constructor?

Advanced object oriented concepts

• 55 . What is polymorphism?

• 56 . What is the use of instanceof operator in Java?

• 57 . What is coupling?

• 58 . What is cohesion?

• 59 . What is encapsulation?

• 60 . What is an inner class?

• 61 . What is a static inner class?

• 62 . Can you create an inner class inside a method?

• 63 . What is an anonymous class?

Modifiers

• 64 . What is default class modifier?

• 65 . What is private access modifier?

• 66 . What is default or package access modifier?

• 67 . What is protected access modifier?

• 68 . What is public access modifier?

• 69 . What access types of variables can be accessed from a class in same package?

• 70 . What access types of variables can be accessed from a class in different package?

• 71 . What access types of variables can be accessed from a sub class in same package?

• 72 . What access types of variables can be accessed from a sub class in different package?

• 73 . What is the use of a final modifier on a class?

• 74 . What is the use of a final modifier on a method?

• 75 . What is a final variable?

• 76 . What is a final argument?

• 77 . What happens when a variable is marked as volatile?

• 78 . What is a static variable?

conditions & loops

• 79 . Why should you always use blocks around if statement?

• 80 . Guess the output

• 81 . Guess the output

• 82 . Guess the output of this switch block . 

• 83 . Guess the output of this switch block?

• 84 . Should default be the last case in a switch statement?

• 85 . Can a switch statement be used around a String

• 86 . Guess the output of this for loop

• 87 . What is an enhanced for loop?

• 88 . What is the output of the for loop below?

• 89 . What is the output of the program below?