Java Interview Questions And Answers | Java Programming Interview Questions And Answers |Simplilearn
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- Опубликовано: 16 июл 2024
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Get the top Java Interview Questions And Answers to ace your job interview and excel your career as a Java Developer. Let's begin!
This video is based on the most frequently asked Java Interview Questions and Answers. This video explains all the corporate level Java Interview Questions and Answers in detail to help beginners in a theoretical way for a better learning experience. Below are some of the Java interview questions answered in the video:
0:00 Java interview questions
01:33 What is JIT?
01:39 What is a ClassLoader?
01:10 What are the memory allocations available in Java?
02:37 Will the program run if I write static public void main?
03:13 What is the default value stored in local variables?
04:19 What is the output of the following code segment?
06:36 What is an Association?
07:58 Define copy constructor in Java
08:39 What is a Marker Interface?
09:16 What is object cloning?
10:06 Why is Java not completely object-oriented?
10:37 Define wrapper classes in Java
11:23 Define singleton classes in Java
11:48 Define package in Java
13:20 Can you implement pointers in a Java program?
14:18 Differentiate between instance and local variables
14:58 Explain Java string pool
15:49 What is an Exception?
17:15 What is a final keyword in Java?
18:06 What happens when main() isn't declared as static?
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Java is an object-oriented, class-based, high-level programming language used for software development, mobile application development, website development, desktop application development, and much more. Java is one of the leading and in-demand programming languages in the current IT industry.
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Q.28. We can overload static method . As overloading happens at compile time and static method binds at compile time So we can overload static method.
public class StaticMethodOverloading {
static void display(int a){
System.out
.println("Value of a : "+a);
}
static void display(int a,int b){
System.out.println("Value of a: "+a+" And value of b: "+b);
}
static public void main(String[] args){
display(5);
display(7,9);
}
}
Above example will be complied without any error
Q 22: please check the difference between public and default access specifiers. Default members are not accessible outside the package whereas public members are accessible from anywhere.
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Toooo many wrong answers!!
Q27 : - Method Overloading there is one error - Varying the return type of the method . But overloading is not depend on return type. It is depend on data of parameter and as well as no. of parameter.
I found beginners question harder than intermediate 🤔
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Q27. varying the return type doesn't lead to Method overloading as you can't have two methods with the same signature(parameters, type of params, and order) and have different return types. This is because if it's possible, this leads to ambiguity at run time, and JVM doesn't know which method to call.
Please correct it. Great job otherwise!!
Q.28: Can we overload a static method?
Correct answer is: Yes
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Your choice of questions are very accurate but you missed few oops concepts, this video is really helpful. And I am glad I found your video.
Thanks and thumbs up from myside.
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Correction : We can overload a static method.
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Right👍🏻
We can't override static method
In which jdk version we can overload static method
Question no -27 wrong explaination In overloading compiler doesn't consider return type of method.(it gives Compile time error)
Hi Mahesh, Thanks for the feedback. We shall share your concerns with the concerned department.
please correct Q. 5
Java Global variables have the default values for primitive types.
boolean false 1 bit
char '\u0000' 2 byte
byte 0 1 byte
short 0 2 byte
int 0 4 byte
long 0L 8 byte
float 0.0f 4 byte
double 0.0d 8 byte
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Q13: correction:- constructor is made private so that no one can create object out of it. You provide public static method which returns instance of singleton class.
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We can overload static method but we can't override static method
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@@SimplilearnOfficial But you didn’t correct it yet.
Questions are good but you need to further validate on the answers to many questions.
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Exactly 💯correct
Answer of 28 question is yes, we can overload static method
Great!!! please include collection questions too
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good video... but the beginner questions are harder than the intermediate questions.
Q27: Method overloading cannot be done with return type modification. Please check and update in the video
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Hi Simplilearn Team, very well explained. Thanks. Can you please share the document or share the link to download it. That would be very helpful
Hello, thanks for viewing our tutorial. You can find your requested dataset in the video description. Hope that helps.
@@SimplilearnOfficial Thanks.
Watch full collections interview questions here part 10 to 15.....
Great job!!!
Thank you! Cheers!
Please note that in Q1, you read "Java-in-Time Compiler", while your text correctly stated "Just-in -Time Compiler".
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and then he said Java interpreter instead of compiler.
Excellent way of explination, i searched many video with simple explination but here i got.....
Glad to hear that! Thank you for watching!
In Java all local variable have default values. Number variable have 0, boolean habe have false and object reference have null as default values. Variable declared in method needs to be Initialized which are by default final.
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q 28 : you says like static method can not overload .. but we can overload the static method . but we cannot overload two methods in Java if they differ only by static keyword (number of parameters and types of parameters is the same).
The answer is 'Yes'. We can have two or more static methods with the same name, but differences in input parameters The question was focused on having static methods with same parameters
A static method can be overloaded, but can not be overridden in Java. Correct your answer please.
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Thanks for a very informative video
We're thrilled to have been a part of your learning experience, and we hope that you feel confident and prepared to take on new challenges in your field. If you're interested in further expanding your knowledge, check out our course offerings in the description box.
IDE stands for Integrated Development Environment not Integrated Development Enterprise. Nice set of questions but very careless errors.
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Wow, it's really nice. It's very attractive
Question 28 wrong, we can overload static method we cant oweride it
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Thank you so much
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Nice information thanks a lot ☺️
Glad you found it useful. Thank you for watching!
Thank you
You're welcome! Thank you for watching!
too good ☺💖
Nice.......
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Awesome
Thanks a ton! Your support makes all the difference 💙
Q24 - is wrong wording too. This makes an access to stuff from the current instance, not the „class“. Accessing stuff from the class would be more like static properties.
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thanks alot
Your support means a lot to us and it motivated us to create even better learning content and courses experience for you.
JDBC is an abbreviation for "Java Database Connectivity", not a connector.
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Hello ! I want to ask one question which computer field will make me earn more in the starting of my career
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Q22 answer is wrong. Private definition is incorrect and Protected is not more secure than private.
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Get more assistance in comments section than Video..!!
Thanks !
Thank you for your review. We’ll strive to do better.
Why did you overlook discussing modules when talking about packages?
one tip : ignore the third section
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33:59 advanced questions
i wish you could give example and explain
Good idea. We will try to implement that in future videos.
This video is full of errors, will create more confusion to begginers instead of actually helping out! Choose your information carefully
Hi, sorry to hear that. Could you please explain a bit more on what has gone wrong. So that we can convey it to the concerned team. Thanks!
I do not know who did this video, but it has so much wrong informations.
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java automatically allocate memory.
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No sample or examples provided. Only definition. No use of this video session
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We can overload static method.
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Yes
Can you share the ppt
We don't have any pdf of this particular video. For slides, you can check out our slideshare profile: www.slideshare.net/Simplilearn"
@@SimplilearnOfficial ok sir
This video has many inaccuracies. I do not recommend anyone watch it to prepare for interviews.
Some problems I saw before I stopped watching
1) Singelton classes were not properly explained at all. This is a bigger subject than I can cover here.
2) Access modifiers were very poorly explained. The most important one on there from the standpoint of an interviewer trying to see if you really know your material (IMO) is the protected modifier. Only a hand waving explanation was given in the video. In essence inheriting classes from OTHER packages can access (unlike package private)
3) Method overloading was flat wrong. The return signature DOES NOT MATTER. Try it yourself, declare two functions with the same method parameters and different return types.
4) Static method overloading, this was really poorly described and I think the speaker was confused himself. You cannot overload a static method with an instance method with the same method signature (ie write the same method, except put a static keyword in one). You can however have two static methods with different method signatures (ie parameters).
I stopped watching after overloading. You are better off passing on this video, rather than learning incorrect information.
Thank you for your review. We are sorry to hear you had such a frustrating experience, but we really appreciate you bringing this issue to our attention
lot of wrong answers 🙄