- Write Fibonacci series programming and explain logic
- how auto wiring works in spring
- write a program for dependency injection
- how security is implemented in your project.
- difference between filter and map in java streams.
- Explain about your current project.
- How to read the file and display total count of each word.
- How angular Makes calls to spring boot
- What is spring profile
- There is a list with emp objects with duplicate name, age attributes. How to retrieve uniques names.
- What Technologies used in last project.
- Abstract class and encapsulation.
- What is HashMap? how it works.
- what is inter thread communication
- what ArrayList ? extends object and ArrayList? super object means
- what is splice and slice
- difference between == and ===
- Write a Java 8 program to get the sum of all numbers present in a list?
- what FlatMap?
- write a prog ..how to sort emp obj in java8
- Given the list of employees, find the employee with name “R”.
- Angular Routing process
- Difference Between constructor vs ngOnInit in Angular
- how to find which datatype is created in JavaScript
- what is id in CSS
- how to create a singleton object
- what is static method, static block and static class
- what will happen if we add final to a method
- what is @path and path param, path variable
- what is multi catch block
- what is subquery and when we use it
- how to use service in angular
- difference between @Input and @Output in angular
- what is event emitter
- what is @beanpropertyrowmapper
- Handle cross horizon resource sharing-angular, how can u candle hash code, equal
- sql query, highest salary- department wise
- Routing in Angular
- import and export in ngModule
- what is ngModule
- directives and use of them in angular
- routes in angular
- what is children attribute in routes in angular
- Hibernate OneToMany and ManyToOneMapping example
- How to return a single user if userId passed or list of users if userId not passed in JPA
- Micro services communication
- Autorization and authentication process in current project
- String reverse program
- Spring JPA Example
- Factory design pattern
- Singleton Design pattern and real time usage and implementation
- How to prevent singleton object from clone?
- Synchronous and asynchronous requests, how to consume angular http request and services
- Springcloud config
- publishing a service in spring cloud
- diff b\w rest and soap
- what is the new in the current java version compared with previous versions?
- What is the lambda expression?
- What is a functional interface and it’s example?
- How many ways to create a thread and it’s life cycle?
- What are streams in java?
- What is the difference between a hashset and concurrenthashset?
- Difference between hashmap and concurrenthashmap
- What is LinkedHashMap
- What is a static method in java?
- How the static class locking works?
- what is a singleton design pattern and how do you create it?
- What are directives in angular?
- What are pipes in angular?
- How do components communicate with each other and data transfer among them?
- What is DDL and DML??
- What is the difference between Truncate and Delete?
- What is the difference between function and procedure?
- What is immutable class
- Method to find missing number in a Array list with value from 0-100. (number 7 and are missing)
- find the number of integer appear in a array list having duplicates
- Explain Quick sort
- Serialization
- what is executer framework and cachethreadpool
- How hashMap works internally
- Spring & Microservice
- What is microservice and its architecture
- How to handle situation if one of microservice fails
- What is API gateway
- What is client side load balancing
- Spring life cycle
- What is dependency Injection
- Annotation used in circuit breaker implementation
- Microservice design patterns
- fast iterate and safe iterate
- How you read file from angular
- difference between get and load in hibernate
- Spring JPA CRUD Repository
- jdbcTemplate methods
- difference between Observer and subscribe in angular
- Spring boot and hibernate integration steps
- How you read properties file from springboot
- sql query for one to many mapping.
- Functional interface.
- Design patterns used Realtime in your application.
- Java Multithreading – wait & notify, Obtaining lock.
- Static and Dynamic Overloading.
- Spring security its annotations.
- Java 1.8 features.
- Angular Observable subscribe and unsubscribe.
- what happens when we call a void method in a system.out.println()?
- What is Resource(Request) and Response in Restful services?
- how can I return custom data instead of JSON or XML content for a Rest response?
- what are stream(s) in java and few operations on them like comparison
- difference between comparable and comparator
- why Clonable is not implemented by Collection interface, reason?
- Components in angular
- What is the life cycle of components in angular
- Sharing data between components in Angular
- Type Script compilation process
- Angular life cycle
- what are gate in angular
- in how many ways I can sort my employee object with the given set of columns, explain?
- How to create schedulers in java
- How we implement batch import and export functionality in spring.
- How to maintain session in server side.
- Lifecycle process of angular
- How to reload header and footer menu based on particular left menu routing
- Box model in CSS
- Pseudo selector in CSS
- Difference between display block & display inline-block
- Difference between position absolute and position relative
- What is the internal implementation of HashMap?
- What is the algorithm/datastructure used to get an emlement from HashMap?
- How to make HashMap synchronized
- Difference between HashMap & concurrent hash map
- Authenticate client side in angular
- Time difference calculation in angular
- How to create Generic class in angular
- Difference between Post and PUT
- Stored Procedures
- Monolithic architecture and Microservice Architecture
- java 8 new features
- List of collections used
- How exceptions are handled
- Throw and Throws
- Final, Finally, Finalize
- Spring IOC
- Spring boot advantages
- JPA repository
- First level second level cache in hibernate
- Union vs Union all
- Spring security
- Spring transactions
- Custom directives
- Get and post in angular
- employee has id, name, salary. Find the list of employees where the employee name starts with “n” using java8?
- can you the same in ArrayList and array?
- Vulnerability checking process in the front end
- Have you worked on Cross Site Scripting?
- What are the challenged faced in Cross Site Scripting?
- Have you worked in Custom annotation creation in Java?
- if yes? Could you explain the implementation of custom annotation?
- Where thread class variables will get store in Memory?
- What are the different databases you worked?
- Did you face any query performance issues? how did you increase the performance of the query?
- What is index and query of it?
- What is the data structure used to create an index?
- How can you handle the errors in Spring Boot?
- Can you explain what are the dependencies required to create REST application in Spring Boot? what other classes needs to be created to perform CURD operations and it’s flow?
- How you worked on application security?
- angular life cycle hooks
- Explain insertion sort logic
- Write query to get 3rd highest salary of employee
- How to get the average value of integers using streams
- What are method references
- What are for lambda expressions introduced and what is the advantage
- explain proxy pattern
- how to find duplicate user object user {name, age}
- What is observable
- What is cluster index
- What is the deployment procedure of Micro services
- Explain service discovery pattern
- What is containerization
- how to import module and service in Angular
- Difference between monolithic and microservices architecture.
- Difference between Spring and Spring boot
- Explain about Spring boot starter
- Spring security
- @Springboot application
- Gates in angular
- Life cycle of angular hooks
- How to pass the data between components.
- Structural and behavioral directives
- Multi threading concepts
- Architecture of the current project where you are working
- Architecture of angular application
- Difference between soap and Rest
- Questions on GIT code checkout process
- Questions on Front end security concepts
- Code deployment procedure
- Load balancing concepts related to services
- REST and SOAP justification for usage
- Questions based on resume and projects explanation Why ? What ?
- How we used if we mention any technology
Author: Subbareddy Nallamachu
Full Stack Developer + System Design + REST API Expert + Distributed Transactions + NOSQL + Microservices + Docker + Pivotal Cloud Foundry (PCF)
Java : Lambda Expression
What is Lambda expression?
As per Wikipedia, lambda expression also called as anonymous function. It’s a function without name and does not belong to any class. Lambda expression is introduced as part of Java 8 features.
A traditional method or function in java has these main parts.
- Name
- Parameter list
- Body
- Return type
A lambda expression in java has these main parts.
- No Name: as this is anonymous function there is no name needed
- Parameter list
- Body: this is the main part of the function
- No return type: you don’t need to mention the return type in lambda’s expression. The java 8+ compiler is able to infer the return type by checking the code.
Program of using lambda expression without any parameters:
@FunctionalInterface
interface NoParamInterface{
String printHelloWorld();
}
public class NoParamLambdaTest{
public static void main(String[] args) {
NoParamInterface noParamInterface= () -> "Hello World";
System.out.println(noParamInterface.printHelloWorld());
}
}
Program of using Lambda expression with single parameter:
@FunctionalInterface
interface SingleParam{
int incrementBy10(int x);
}
public class SingleParamLambdaTest {
public static void main(String[] args) {
SingleParam singleParam = (x) -> x+10;
System.out.println(singleParam.incrementBy10(5));
}
}
Program of using Lambda expression with multiple parameters:
@FunctionalInterface
interface MultiParam{
String concat(String x, String y);
}
public class MultiParamLambdaTest {
public static void main(String[] args) {
MultiParam multiParam = (x, y) -> x+" "+y;
System.out.println(multiParam.concat("Hello", "World"));
}
}
Program of using Lambda expression with Runnable interface:
public class RunnableExample {
public static void main(String[] args) {
//Traditional way of implementation
Runnable runnable = new Runnable() {
@Override
public void run() {
int sum=0;
for(int i=0;i<10;i++)
sum +=i;
System.out.println("Traditional : "+sum);
}
};
new Thread(runnable).start();
//Implementing using lambda
Runnable runnable1 = () -> {
int sum=0;
for(int i=0;i<10;i++)
sum +=i;
System.out.println("Lambda : "+sum);
};
new Thread(runnable1).start();
//Implementing Thread with Lambda
new Thread(()->{
int sum=0;
for(int i=0;i<10;i++)
sum +=i;
System.out.println("Thread with Lambda : "+sum);
}).start();
}
}
Program of using Lambda expression with Callable interface:
import java.util.Arrays;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.stream.IntStream;
public class CallableExample {
public static int[] array = IntStream.range(0,5000).toArray();
public static int count = IntStream.range(0,5000).sum();
public static void main(String[] args) throws InterruptedException, ExecutionException {
Callable<Integer> callable1 = () -> {
int sumOfEven=0;
for(int i=0;i<array.length;i++){
if(i%2 == 0)
sumOfEven = sumOfEven + i;
}
return sumOfEven;
};
Callable<Integer> callable2 = () -> {
int sumOfOdd=0;
for(int i=0;i<array.length;i++){
if(i%2 == 1)
sumOfOdd = sumOfOdd + i;
}
return sumOfOdd;
};
ExecutorService executorService = Executors.newFixedThreadPool(2);
System.out.println("Sum of Even of given range: "+executorService.invokeAny(Arrays.asList(callable1)));
System.out.println("Sum of Odd of given range: "+executorService.invokeAny(Arrays.asList(callable2)));
executorService.shutdown();
System.out.println("Count of the given range is : "+count);
System.out.println("Sum of Odd and Even is equals to count");
}
}
VirtualBox cannot run when Hyper-V is installed
Objective of this article to share how to solve the problem of VirtualBox can not run when Hyper-V is installed in windows machines. This problem might occur when we try to run VirtualBox where already docker was installed. Because docker internally enables Hyper-V configuration in windows which will be the problem to run VirtualBox.
There are total 3 steps which we must follow to enable/disable Hyper-V in Windows 10.
- Search for Apps & Features in Windows Search option
- Search for Turn Windows features on or off
- Select/deselect the Hyper-V option from the popup opened to enable/disable accordingly.
For more detailed explanation continue with further article.
- Search for Apps & Features in Windows Search option: Look at the below image for more easiness to find Apps & Features option.
- Search for Turn Windows features on or off
- Select/Deselect the Hyper-V option from the popup opened: Deselect Hyper-V option and click on OK button to disable Hyper-V in your system. Since Hyper-V is OS level configuration, it will ask to restart the computer to make changes are affected.
We should restart the system to make affect of Hyper-V configuration changes. Afterwards, try to run the virtual box again. Hope it will run successfully without any failure.
Master From Us 