Important Topics

Important Topics Of Java

Core Java :(*imp)

1.Oops, Concept. *

2.Multi-Threading.

3.Exception Handling.*

4.Collection.*

Advance Java:

1.Jsp.

2.Servlet.

3.Jdbc Connection Setup.

Frameworks:

Spring:

1.Spring Ioc.

2.Spring MVC.

3.Spring & Hibernate Integration file. (spring-servlet.xml)

Hibernate:

1. Hibernate XML file.(config. file).

2.Relationship.

3. Hibernate Annotations.

4. Hibernate Class And Interface.

Spring Boot:

1.Spring Boot Starter Projects

2.Spring Boot Starter Parent

3.Auto Configuration

Most often questions asked in Java interviews are based on these concepts(in the approximately increasing order of difficulty):

Polymorphism
Dynamic Binding
Abstraction
Data hiding
Inheritance
Method overriding
Exception Handling
Database connection setup(JDBC/ODBC)
Access modifiers
Exception cascading
Immutability
Unit testing and integration testing
Wrapper classes
Object class
Java libraries and packages
Java util class
Java collections
Java generics
Microservices
Object-Oriented Design
Design Patterns(Singleton, Factory, etc)
Frameworks(Play framework, Spring boot, Apache Tomcat, Hibernate)
Java Reflection

Comments

JDK 25: The new features in Java 25

Java Development Kit (JDK) 25, scheduled for release in September 2025, is set to introduce several significant enhancements. Here's an overview of the notable features: 1. Stable Values API (Preview): This feature introduces stable values—objects holding immutable data treated as constants by the Java Virtual Machine (JVM). By allowing greater flexibility in initialization timing compared to final fields, stable values aim to improve application startup times. They enable performance optimizations akin to constant-folding, previously exclusive to JDK code, and ensure thread-safe, single-time initialization. This decouples the creation of stable values from their initialization without significant performance penalties. 2. Removal of 32-bit x86 Port: JDK 25 plans to eliminate both the source code and build support for the 32-bit x86 port, which was deprecated in JDK 24. Maintaining this port has become less beneficial, especially with the challenges in keeping it updated wit...

what is circuit breaker in microservice

A circuit breaker is a design pattern used in microservice architecture to improve the resilience and fault tolerance of the system. In a microservice architecture, multiple services work together to deliver a business function. When a service is not available, the downstream services depending on it may start to fail as well, leading to a cascading failure. A circuit breaker helps prevent cascading failures by monitoring the status of the dependent services. If a dependent service is not responding, the circuit breaker trips and redirects the traffic to a fallback mechanism, such as a cache or a default response. The circuit breaker periodically attempts to reconnect to the dependent service, and once it's available, it resumes directing traffic to it. The circuit breaker pattern helps prevent failures from spreading across the system, improves the availability of the overall system, and can help reduce the load on dependent services.

Interview Goal

Search This Blog