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21 String Programming and Coding Interview Questions With Solutions

In this article, I am going to share 21 of the most common String based Programming and Coding interview questions from Java developer interviews. These questions require you to write code to solve the problem and they are different from traditional Java String questions like how substring method works in Java or when to use the intern() method of String in Java? Since coding and problem solving is an important part of any programming job interview, it's imperative that you know how to solve them in time and on pressure situation, which comes only after doing practice with a right set of questions. 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.

A Simple Example to Check if File is Empty in Java

One of the readers of my blog Javarevisited emailed me yesterday about how to check if a file is empty in Java and that's why I am writing this post to show that using an example. The common approach for checking if a file is empty or not is to first check if the file exists or not and then check if it contains any content, but Java has done that hard work for you. Well, it's pretty easy to check emptiness for a file in Java by using length() method of the java.io.File class. This method returns zero if the file is empty, but the good thing is it also returns zero if the file doesn't exist. Which means you don't need to check if the file exists or not.