![]() These questions are not based on theoretical concepts, like Why String is Immutable in Java, but slightly based upon the string data structure and require a lot of coding practice to solve them in limited time.ġ) How to find the maximum occurring character in a given String? ( solution) Here are 21 most frequently asked String-based questions from a programming job interview. String Programming and Coding Interview Questions If you haven't revise your data structure and algorithms, then Data Structures and Algorithms: Deep Dive Using Java is an excellent course to start with before you go for the interview. For example, by using a set, you can quickly figure out duplicate characters of String.Īlso, you should be able to calculate the cost of your solution, like time and space complexity on Big O notation. In order to improve the solution, good knowledge of data structure is mandatory because, in many cases, a choice of good data structure not only makes the solution simple but also fast. In a real interview, an interviewer is as much interested in the solution as in improvement and optimization. Remember, it's not just essential to solve the problem but also to understand the solution and improve it gradually. I have also provided the links to solutions for most of the questions so that you can quickly check your answer and code. You can use all the tips and tricks you learned by answering an array-based coding question to also solve String, like reversing a String is the same as reversing an array and so on. This means you can solve many String-based problems by assuming it as a character array. But, in Java, String is an object, which holds data in a character array. If you don't know, String is nothing but a character array in most of the languages like C. Since these questions are already tried and tested and appeared in many interviews, they will provide you the experience you need to crack your coding interview.Ī string is one of the most popular data structures, probably next to the array and that's why you will find at least one question from String in any programming job interview. These questions require you to write code to solve the problem and they are different from traditional Java String questions like how the substring method works in Java or when to use the intern() method of String in Java? Since coding and problem solving are an important part of any programming job interview, it's imperative that you know how to solve them in time and in a pressure situation, which comes only after doing practice with the right set of questions. In this article, I am going to share 21 of the most common String-based Programming and Coding interview questions from Java developer interviews. ![]()
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