11+ Proven Java Developer Interview Questions +Answers

Java offers a method for setting up threads and synchronizing their operations with the aid of synchronized blocks. The synchronized keyword in Java is used to identify synchronized blocks. Only one thread can be running at a time inside synchronized blocks since they are all synchronized on the same object. Until the thread inside the synchronized block exits the block, all other threads trying to enter the block are blocked. Dynamically expanding array lists make it possible to add new elements at any time. The underlying data structure of the ArrayList is an array of the Object class.

To optimize this, I refactored the SQL queries to make them more efficient and implemented pagination for large data sets. Additionally, I used caching mechanisms like EhCache to store frequently java 7 certifications accessed data which significantly reduced the load on the database. Spring’s Inversion of Control (IoC) container manages beans, promoting loose coupling and easy unit testing.

What is the main objective of garbage collection?

Structural patterns are used for assembling objects and creating relationships between them. Some examples of Structural patterns are Adapters, bridges, and Composites. https://remotemode.net/ Some examples of Creational patterns are Singleton, Factory, and Abstract Factory. In this code, we pass the value of num to the changeValue() method.

Is AI in software engineering reaching an ‘Oppenheimer moment’? Here’s what you need to know — ZDNet

Is AI in software engineering reaching an ‘Oppenheimer moment’? Here’s what you need to know.

Posted: Tue, 03 Oct 2023 07:00:00 GMT [source]

You should be prepared to talk about the strategies you use to stay informed. Are you a member of any professional organizations related to software development? Do you have any mentors who provide guidance on new technologies?

Q127. How to create a custom Exception?

The Timed Waiting state represents a thread that is waiting for a specific amount of time to elapse. The Terminated state represents a thread that has completed its execution. This is because an array is a contiguous block of memory where each element occupies a fixed amount of space. Shallow copy and deep copy are two types of object copying in Java.

  • Hibernate framework provide option to map plain old java objects to traditional database tables with the use of JPA annotations as well as XML based configuration.
  • The interviewer is looking to understand how you approach these issues and what strategies you use to ensure that the code is able to scale and meet the demands of the application.
  • Some examples of Creational patterns are Singleton, Factory, and Abstract Factory.
  • Binding is a process of unifying the method call with the method’s code segment.

Another way to use threads in Java is by using the Executor framework, which provides a higher level of abstraction for managing threads. The string class is immutable but the other two are mutable in nature. StringBuffer is synchronous whereas the StringBuilder is asynchronous. String uses string pool as memory storage whereas the other two use heap memory for storage purposes. Because of security, synchronization, concurrency, caching, and class loading, the String is immutable in Java.

Q74. What are the different methods of session management in servlets?

In Java, constructor refers to a block of code which is used to initialize an object. Also, it has no return type and it is automatically called when an object is created. When answering this question, you should focus on your approach to refactoring legacy code. Talk about the steps you took to identify and solve the problem – such as researching existing solutions or analyzing the source code for potential improvements. You can also discuss any tools or techniques you used to improve performance, such as caching or optimizing algorithms.

java developer interview questions

Static binding is used during overloading, whereas dynamic binding is used during methods overriding. Developers use Java Cryptography Architecture to combine the application with the security applications. Java Cryptography Architecture helps in implementing third party security rules and regulations.

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