Over the past 25 years, Java has been a popular programming language among all developers because of its user-friendly and flexible nature that can be used for platforms and web applications development. When it comes to Java interview questions, interviewers sometimes pay close attention to the Java string. The String class in Java is among the fundamentals of Java programming and therefore, knowledge of String is a prerequisite for every Java programmer. Whether it's a Java desktop application, enterprise application, web application, or mobile application, every Java application makes use of the String class. It is therefore one of the hottest and most important topics in Java interviews.

In this article, we have compiled a comprehensive list of insightful Java String Interview Questions for both Freshers and Experienced that focus on a range of topics including thread-safety, immutability, string methods in Java, StringBuilder and StringBuffer, memory consumption, comparing String instances in Java, using String as the key in HashMap, equals() vs == check for String, etc. These questions will be a great HELP to know about the String concept in detail and be prepared to tackle String-related questions during a Java technical interview.

Before we begin, let's have a quick look at what Java String is all about.

Strings, one of the most common objects used in Java programming, are essentially sequences of characters. As an EXAMPLE, the string "Scaler" contains the following characters: "S", "c", "a", "l", "e", and "r". You can either create a string by using String Literal or by using the NEW KEYWORD. Additionally, String supports a variety of methods to operate on Strings, such as the equals method to compare two Strings, the replace method to replace String characters, the SUBSTRING method to get a substring, the TOUPPERCASE method to convert String to upper case, the split method to split a long String into multiple Strings, and so on.

Now let's look at the most common asked String Interview questions:

• Java String Interview Questions for Freshers
• Java String Interview Questions for Experienced
• String Programming Questions