Identifying the root cause of the issue can be difficult, so this is a good interview question for experienced candidates. Stashing is a powerful tool to put aside code that you just wrote, without pushing it to any remote tracked branch. While it’s possible to create multiple stashes at once by giving them different names, it’s usually better to not have more than one stash, as things can become complex to restore. Is there any difference between creating a local git branch and a git stash?
- Yes, since the overloaded method is a completely different method in the eyes of the compiler.
- I suggest you practice the below questions and other related domain areas before your next tech interview.
- There are two types of Java constructors – default and parameterized.
- An immutable object is one that cannot change after it’s constructive.
- When two or multiple methods are in the same class with different parameters but the same name.
Microservice Interview questions for Backend Developers series-2 (CIRCUIT-BREAKER)
When an array is created with the help of a new keyword, memory is allocated in the heap to store the elements of the array. In Java, the heap memory is managed by the Java Virtual Machine(JVM) and it is also shared between all threads of the Java Program. The memory which is no longer in use by the program, JVM uses a garbage collector to reclaim the memory. Arrays in Java are created dynamically which means the size of the array is determined during the runtime of the program. The size of the array is specified during the declaration of the array and it cannot be changed once the array is created.
How to create a custom endpoint in Spring Boot Actuator?
An abstract class and an interface are two important concepts in Java that allow for abstraction, but there are some key differences between them. All three threads will be able to acquire a lock on the first object. However, they are using shared resources and are started in such a way that they will keep on waiting indefinitely to acquire the lock on the second object. Post jobs, get candidates and onboard employees all in one place.
Can you explain why Kubernetes skills are an advantage for senior Java developers?
This means that codes used in one class can be reused in another class. Deque is used to implement a stack or dequeuing elements from both ends. Elements in the queue can only be inserted at the end of the data structure. FailSafe does not throws any exception but instead, it creates a copy of the collection to iterate. It requires more memory than a singly linked list as each node has two pointers.
What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?
Examples of classes provided include TreeSet, HashMap, and ArrayList. Java is a very secure programming language as it is hard to bug or tamper with. It is also very easy to learn and comprehend when developing applications.
Java database connectivity interface (JDBC) is a software component that allows Java applications to interact with databases. To enhance the connection, JDBC requires drivers for each database. We create a new class that implements java.lang.Runnable interface and override run() method. Then we instantiate a Thread object and call the start() method on this object. LinkedList Elements are stored in non-contiguous memory locations as each element has a reference to the next and previous elements.
These are all important concepts for experienced Java developers in full stack, software development to know and understand in order to write efficient, maintainable, and scalable code. Being able to confidently answer these questions can help senior developers demonstrate their skills and expertise in Java programming java interview questions for senior developer during job interviews. Java is one of the programming languages that are very high in demand. Many applications are built and maintained by this incredible language, more reason for anyone to invest time in learning and developing their skills. So, how will you swim through your advanced java interview questions?
Aggregation is a term related to the relationship between two classes best described as a “has-a” relationship. It is a unidirectional association means it is a one-way relationship. It contains the reference to another class and is said to have ownership of that class.
For this question, candidates would have to think through how a chat app works and the types of data such an application may need to store. The form of the data being stored, the way it is collected and how often it is accessed all have to do with the type of database to use. For instance, chat apps may need to store chat histories, user profiles, images or videos — these different formats can all affect the type of database that works best. Here are three examples of coding interview questions for senior Java developers. He said a common scenario to imitate would be a rental car business.
A private constructor is used if you don’t want any other class to instantiate the object to avoid subclassing. The use private constructor can be seen as implemented in the example. If you don’t provide a constructor in a class in Java, the compiler automatically generates a default constructor with no arguments and no operation which is a default constructor. To know more about methods to create objects in Java refer to this article. Static methods can be called using the class name only without creating an instance of a class. In Java, Classes are the collection of objects sharing similar characteristics and attributes.
Checked exceptions are checked by the compiler at compile-time. These exceptions must be either caught or declared in the method signature using the “throws” keyword. Examples of checked exceptions include FileNotFoundException and IOException.
Oladipo would ask candidates to draw out on a whiteboard the classes and methods needed to run a rental car company. This is a chance to demonstrate high-level understanding of Java by talking about some of the key features that made it attractive. Candidates should expand on the kinds of projects they’re looking to work on and how Java makes that kind of programming and development https://www.trading-market.org/ possible. This question also allows applicants to make reference to the direction they’re looking to take their career in as a java developer — a point that should connect to the position. Java supports primitive data types such as boolean, int, byte, long, float, etc. However, the primitive data types are not objects, hence Java is not considered to be purely object-oriented.