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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.
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?
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?
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?
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?
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?
And Many More Questions mixed with the concept.
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