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Core Java Programming Interview Questions
Hello, Java programmers! Over the past few years, I have personally shared many Java interview questions and discussions. Many of my readers have requested that I bring them together so they can have them in one place. This post is the result of that.
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This article contains more than 50 Java interview questions covering all important topics like Java Fundamentals, Java Collection Framework, Java Multithreading and Concurrency, Java IO, JDBC, JVM Internals, Coding Problems, Object Oriented programs, etc.
The questions are also taken from various interviews and are not very difficult at all. You may have seen them in your phone or face-to-face interviews.
Quizzes are also very useful for critical topics such as multi-reading and collection review. I also shared a few
So what are we waiting for? Here is a list of some of the most common Java interview questions for both beginners and experienced Java programmers.
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So, without wasting any more of your time, here is my list of some of the most frequently asked core Java interview questions for beginner programmers. This list focuses on beginners and the less experienced, such as those with 2 to 3 years of experience in Java.
Hint: You can use bitwise operator like bitwise and note that even number in binary form has trailing zero and odd number has trailing 1.
This applies, for example, order, duplicates, random search, etc. See Java Basics: Collections by Richard Warburton for more information about ArrayList, HashSet and other important collections in Java.
Tip: many ways, like using enum or using double-checked locking pattern or using nested static class.
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Tip: When you want to make a variable non-serializable in a class, which implements the Serializable interface. In other words, you can use it for a variable whose value you don’t want to store. For more information about transient variables in Java, see The Complete Java Master Class.
Hint: When you need to instruct the JVM that a variable can be modified by multiple threads and give a hint to the JVM not to save the value.
Hint: No, because it is not visible in a subclass, the first requirement to override a method in Java.
Light on all wires waiting on the monitor. If you are sure that only one thread is waiting, then use it
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Tip: Complying with equality and hashcode agreement, which is necessary if you plan to store your objects in collection classes, for example.
Hint: Like an array and a linked list, one allows random searches while the other does not. Inserting and deleting in a linked list is easy, but searching in an array is easy. See Java Basics: Collections, Richard Warburton’s course on Pluralsight, to learn more about the essential collection data structure in Java.
Tip: This means you cannot assign an instance of a different enum type to an enum variable. For example if you have a variable like
Used by the JVM to locate Java binaries, i.e. JAR files or class files. Check out Java Basics: The Core Platform to learn more
Top 250+ Core Java Interview Questions And Answers 15 March 2023
Hint: Overriding occurs in a subclass while the overload occurs in the same class. Also, overriding is a runtime function while overloading is solved at compile time.
Tip: Inheritance allows code reuse and creates relationships between classes, required by polymorphism, which provides dynamic behavior. See Object-Oriented Java Programming: Data Structures and Other Specializations on Coursera, to learn more about OOP features. One of the most in-depth courses for beginners.
However, if you find Coursera courses useful, which you are because they are developed by world-renowned companies and universities, I recommend that you join Coursera Plus, a subscription plan from Coursera. That gives you unlimited access to their most popular courses. Providing expertise, professional certification, and mentoring projects. It costs around $399 per year, but it’s totally worth your money because you get unlimited certificates.
Tip: The difference from Java 8 is clear. However, a Java class can still implement multiple interfaces, but only one class can extend it.
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Tip: DOM loads the entire XML file into memory while SAX does not. It is an event based parser and can be used for large file parsing, but DOM is faster and should be preferred for small files.
Tip: throw declares which exception the method can throw on error, but the throw keyword actually throws an exception. See Java Basics: Exception Handling for more information about exception handling in Java.
Tip: Iterator also gives you the ability to remove an element while iterating, while enumeration does not allow this.
Hint: This is not supported due to bad experience with C++, but with Java 8 it does in a sense — only multiple inheritance
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Tip: In case of checked, you have to handle the exception using catch block, while in case of unchecked, it is up to you; Compilation will not bother you.
Hint: Both are errors that occur in a normal application, one is caused by thread scheduling while the other is caused by poor coding. See Multithreading and Parallel Computing in Java to learn more about deadlocks, race conditions, and other multithreading issues.
Thanks, you’ve made it to the end of the article… good luck with your programming interview! It will definitely not be easy, but these questions will definitely help you. This will encourage you to learn more.
If you like this article, please share it with your friends and colleagues, and don’t forget to follow JohnPaul on Twitter!
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P.S. — If you need some free resources to learn Java, you can check out my list of the best free Java courses to start your preparation. P. S. S. — I have not prepared an answer to the interview questions shared in the image “How many String objects are created in the code?” Can you guess and explain?
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Basic Java interview questions help you prepare for Java-based interviews. Whether you are a fresher or a highly experienced professional, core Java plays an important role in Java / JEE interview.
Core Java is a favorite area in many interviews and plays an important role in deciding the outcome of your interview.
This post comes directly from my 14+ years of Java programming and lots of interviewing experience. Java 16 was recently released and I updated the post to include some questions from the latest releases.
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Here I am providing some important Java interview questions with answers that you must know. You can bookmark this post to clarify your knowledge before going to the interview.
Java 14 was released on March 17, 2020. This is a non-LTS version. Some of the developer-specific Java 14 features include:
Java 13 was launched on September 17, 2019. This is a non-LTS version. Some of the developer-specific Java 13 features are as follows:
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Java 8 was released in March 2014, so it is one of the hot topics in Java interview questions. The answer to this question will clearly show that you want to keep yourself updated with the latest technologies.
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