java interview questions for experienced. Popular questions

What is Microservice , can you describe Microservice Architecture ? Which protocol you have used in microservices? Write a json example. How do multiple microservices interact with each other ? How to define producer and consumer services in discovery server? What is thread ? Write a program to start a thread? What will happen if you restart a thread? Suppose there are 3 thread t1, t2, t3 , t1 thread generates even no , t2  generates odd and t3 generates prime. How will you make sure that first even no gets printed then odd and then prime no? Write a produce consumer program with a concurrent API ? You can use CountDownLatch . Write a program to remove duplicate elements from a list ? Suppose there is a list of student and that student class contains 3 fields which are StudentName , Student ID and a list of StudnetMarsks. Sort the students based on the highest marks obtained by them ? Highest marks is nothing bot the sum of all the marks obtained in all the subjects . Can we write ...

How to implement your own equals() and hashcode() methods in java? How to implement your own ArrayList in java? How to make your own immutable class in java? How do you append a first name to a list of name using stream? For example if you have a list of name and you want to append Dr. before first name how to do that using java 8? What is strategy in java while implementing your own equals() method? What is upcasting and downcasting What is class cast exception? What is lambda expression ? When to use abstraction and interface ? What is functional interface ? What is abstraction and encapsulation? Give an example of encapsulation?

Core Java         Basic understanding of JVM , JDK ,JRE       Basic understanding of Memory        OOPS Concept Encapsulation        Abstraction Polymorphism Inheritance        String l       String Builder & String Buffer       Arrays       Garbage Collection       Exception Handling       Method  & Classes       Constructor    Serialization Collection Design Pattern  Multi-threading  Spring JDBC Hibernate Spring MVC Spring Boot Spring Security Spring Batch JavaScript Microservice REST API JPA Server JAVA 8 Features Junit Latest Java features of Java 9 ,10,11,12,13,14 Oracle SQL PL/SQL Agile methodology Git MAVEN Jenkins(CI/CD tools) Swagger SonarQube Tomcat Programs Basic Concept of Docker Basic Unix Command Basic Concept of AWS ElasticSearch RabbitMQ Spring Cloud C...