Top Interview Questions for Java Developers

Top Interview Questions for Java Developers
5 min read
19 September 2022

As we continue with the series of Java Interview Questions and Answers, here are the top Java Developer Interview Questions for both freshers and seasoned Java professionals to assist them to ace the Java developer interview.

Java is a well-known programming language among developers. It is a feasible solution because of its easier syntax and widespread support across all major operating systems. There are presently over 10 million Java developers worldwide. Over the years, Java has grown tremendously to deliver more to its consumers. You may learn about the history of Java by looking at the Java version history before beginning to study Java.

In the past, interviews were just used to determine how well you understood particular programming languages on a basic level. Nowadays, the interviewing process is more rigorous, and the level of java interview questions has increased. These days, you may get a wide range of inquiries from several fields that many Java programmers could overlook.

Top 25 Java Developer Interview Questions

What Are Some of Java's Advantages?

The interviewer is attempting to determine the breadth of your Java expertise, analytical ability, and overall proficiency with this question. Based on your expertise, you might highlight the most essential benefits of alternative programming languages. It would be extremely appreciated if you could share a few instances.

The most crucial characteristic for new programmers and developers is simplicity. Java functions are very simple to learn, particularly when compared to other programming languages.

In comparison to other programming languages, the Java programming language is also considered to be highly safe. This is accomplished via the use of an interpreter known as the JVM, which is included with Java and is regularly updated with the most recent security upgrades from the Internet.

Furthermore, Java is completely flexible. The Java language, which is based on the "WORA" idea, may be transferred and used on any computer and operating system - it is entirely adaptable and versatile.

But after answering this question, you should not immediately hire java programmers, but rather ask them a few more complex questions.

What is the distinction between path variables and classpath variables?

Operating systems use the path, an environment variable, to locate executables. For this reason, we must provide the directory path in the Path variable when installing Java for the first time or when we wish the operating system to find an executable.

Java executables utilize the classpath, a Java-specific word, to find class files. When running a Java application, the classpath location may be specified as a directory, ZIP file, JAR file, and so on.

What Is The Relationship Between an Object And a Class?

A class serves as a blueprint for the attributes, states, and actions that are shared by many objects. The term "object" refers to a class instance. For example, suppose you have a class named Vehicle, and the object of that class is Car. You may construct an unlimited number of objects for the Vehicle class, such as Van, Truck, and Auto.

The new operator is used to construct a class object. When a class object is instantiated, the system allocates memory for each data member in the class.

Is Java a Pass By or a Pass By Reference Language?

One of the most baffling Java difficulties is this one; some believe it to be Pass by reference, while others believe it to be Pass by value. But according to the Java Spec, everything in Java is pass by value. These expressions are strongly connected to passing variables and method calls since they act as method parameters. The memory address is moved in the same manner to a new reference variable when we provide a complicated type reference as a method parameter in Java.

What Exactly Is Enum In Java?

Answer: Enum was introduced in Java 1.5 as a new type having a field made up of fixed sets of constants. In Java, for example, directions such as East, West, North, and South are built using an enum as the fixed set of variables. The term enum is used to define an enum type analogous to a class. Enum constants are final and exist implicitly.

What Is The Difference Between Fail-Fast And Fail-Safe?

The Iterator's fail-safe attribute operates with a clone of the underlying collection and is hence unaffected by changes to the collection. The collection classes in java.util package is all fail-safe, but the collection classes in java.util.concurrent are all fail-fast. Fail-fast iterators raise a ConcurrentModificationException, but fail-safe iterators never do.


Programming experts are constantly in high demand. Java is one of the world's most popular programming languages (due to its flexibility, security, and simplicity). We looked over java developer interview questions and answers in this post to assist you to assess a candidate's expertise.

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