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Java is arguably one of the most popular programming languages since the past 25 years. This is mainly because it is not only flexible in nature but also user friendly.
It is commonly used for developing various software applications such as web applications, mobile gaming softwares and several educational platforms as well.
This is one of the main reasons why Java is one of the top choices for the interviewers to conduct coding interviews.
The string class in Java is specifically one of the most popular. String in Java allows the programmers to store data in the form of objects that can be used within a program.
If you are interested in becoming a Java developer, then one of the major prerequisites is to solve the string interview questions in java.
Find the top string questions that are important from the interview perspective in this blog.
Top 20 Java String Interview Questions and how to solve them
There are certainly different levels to the types of string interview questionsthat one can expect within their technical interview rounds.
From freshers to experienced professionals, the string questions differ in terms of their complexities.
With that said, this section offers a segment view of each level of string questions that you will be asked to complete during your interview process. Let's have a look!
Fresher level string interview questions
Q. What is the process of declaring a string in Java?
Q. Would you consider string to be a derived or a primitive class in Java?
Q. What are the differences between the string class in C programming and in Java programming?
Q. How would you create a string pool using Java?
Q. Would you consider string to be immutable or constant in Java? What would you consider are the benefits for string being mutable in Java?
These are some of the fresher level questions that you can expect to encounter in the first round of your string interview. In order to answer these questions you will have to clear the basics of string.
The string is essentially a mutable class in Java that can be declared by using the String str= class function. You can create a string pool in the memory using the same string class function.
Make sure to clear your basics in order to answer the fresher level string interview questions. With that said, the next section will focus on the intermediate level questions for string.
Intermediate level string interview questions
Q. What is the purpose of using the string intern() function in Java?
Q. What are the differences between the string and Stringbuffer in Java?
Q. What are the differences between StringBuffer and StringBuilder in the programming language of Java?
Q. How would you compare two different strings in Java?
Q. What is the main difference between the functions: str1 == str2 and str1.equals(str2)?
As you might have noticed, the intermediate level string interview questionsare related to the different methods and functions that are available for string in Java.
All of these methods are essentially related to manipulating the objects contained within a string.
Even if you forget the function of any of these methods, it is suggested to frame your answers based on how these functions make it easier for the string class to change or add objects within the program.
Some of these methods are also used for comparing different string classes in Java.
For instance, you have the string equals method that is one of the top classes used for making comparisons between two different values in a string.
With that, it's time to move onto the advanced level string interview questions.
Advanced Level String Interview Questions
Q. What are the types of risks involved in comparing the strings using == operator?
Q. How do you consider the substring() class used in Java?
Q. Can you use a switch case for string in Java?
Q. Describe the different forms of string methods that are available in Java?
Q. Would you consider the string thread to be safe for Java?
These forms of advanced level string questions are often asked in the technical interview of various multinational companies.
For instance, you can check out theDE Shaw interview experienceto find out how the candidates have tried to approach these questions.
For starters, it is suggested that you practice using string in real time in order to learn all about the different methods of string.
On the other hand, if you have been practicing string for a while, then you might certainly be able to answer the experienced level string interview questions as mentioned in our final section.
Experienced level string interview questions
Q. Why do you think string is used as a key for HashMap in Java?
Q. If you were to divide a string, how would you achieve that in Java?
Q. Why do most of the programmers use the char array instead of string for storing the passwords?
Q. What is the process for converting a string into an integer in Java?
Q. How would you convert a given string into a StringBuilder in Java?
Now, these are some of the more advanced level questions for string that require coding. This is mainly the reason why this section can only be cleared by people who have a significant amount of experience in Java as well as in creating string objects.
In order to ace this section, we would suggest practicing coding in Java so that you would have a certain level of knowledge of how the string class works in Java.
Start with the basics, and move onto the different class functions to make sure to thoroughly prepare for the experienced level coding questions for string.
Wrapping Up
Strings, arrays and linked lists are some of the top data structures that are extremely essential for Java programmers.
If you are a Java interview aspirant, you should definitely check out the technical interview experiences of different companies such as Microsoft, Infosys, Amazon and DB Shaw interview experience.
These tech interview experiences will guide you through all sorts of questions for string interview.