How To Clear Technical Java Interview In an Hour

How To Clear Technical Java Interview In an Hour

Make Yourself Java interview ready

Language : english

Note: 5.0 / 5.0

Description

Note:- This is just a course to give you an idea about questions in a short span of time. You won’t be finding in-depth explanations of topics.

How about Quickly Revising all the Important Java Concepts in about 1 Hour 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 a Java Interview covering 100+ Java Interview Questions and Answers on a varied range of topics listed below.



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?

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

Exception handling

  • 91 . Why is exception handling important?

  • 92 . What design pattern is used to implement exception handling features in most languages?

  • 93 . What is the need for the finally block?

  • 94 . In what scenarios is code finally not executed?

  • 95 . Will finally be executed in the program below?

  • 96 . Is try without a catch is allowed?

  • 97 . Is try without catch and finally allowed?

  • 98 . Can you explain the hierarchy of exception handling classes?

  • 99 . What is the difference between error and exception?

  • 100 . What is the difference between checked exceptions and unchecked exceptions?




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