Interview Questions and Answers for 'A' | Search Interview Question

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Q2431. Why line 4 in this code gives error saying "Cannot be referenced from a static context" ?

public class OuterClass {

public static void main(String[] args){
InnerClass innerClass = new InnerClass();
}

class InnerClass {

}
}

Core Java

Ans. InnerClass is a non static inner class and hence can only be instantiated using instance of the outer class.

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Q2432. What will the following code print upon executing main method of Main class

public class BaseClass {

BaseClass(){
this(2);
System.out.println("Hello I am in Base Class Constructor");
}

BaseClass(int i){
System.out.println("Hello I am in Base Class int argument Constructor");
}
}

public class DerivedClass extends BaseClass{
DerivedClass(){
super(1);
System.out.println("Hello I am in Derived Class Constructor");
}
}

public class Main {

public static void main(String[] args) {
DerivedClass derivedClass = new DerivedClass();
}
}

Core Java

Ans. Hello I am in Base Class int argument Constructor
Hello I am in Base Class Constructor
Hello I am in Derived Class Constructor

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Q2433. What will the following code print upon executing main method of Main class

public class BaseClass {

BaseClass(){
this(2);
System.out.println("Hello I am in Base Class Constructor");
}

BaseClass(int i){
System.out.println("Hello I am in Base Class int argument Constructor");
}
}

public class DerivedClass extends BaseClass{
DerivedClass(){
System.out.println("Hello I am in Derived Class Constructor");
}
}

public class Main {

public static void main(String[] args) {
DerivedClass derivedClass = new DerivedClass();
}
}

Core Java

Ans. Hello I am in Base Class int argument Constructor
Hello I am in Base Class Constructor
Hello I am in Derived Class Constructor

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Q2434. Why string pool concept has been introduced in string ?

Core Java

Ans. Memory Sharing and Optimal memory utilization.

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Q2435. Write a Program to Find the maximum sum of the sub array ?

Data Structure

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Q2436. Explain In place sorting algorithm ?

Algorithm

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Q2437. How can we check class file format in java ?

Core Java

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Q2438. What are the benefits of Junits ?

Junit

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Q2439. Difference between hadoop 1.x and 2.x?

Apache Hadoop

Ans. Hadoop 1.x

It supports only MapReduce (MR) processing model.
It has limited scaling of nodes. Limited to 4000 nodes per cluster.
It has single Namenode to manage the entire namespace.
It has Single-Point-of-Failure (SPOF)
Works on concepts of slots – slots can run either a Map task or a Reduce task
MR has to do both processing and cluster resource management.

Hadoop 2.x

It supports MR as well as other distributed computing models like Spark, Hama, etc
It has better scalability. Scalable up to 10000 nodes per cluster.
Works on concepts of containers. Using containers can run generic tasks.
It has Multiple Namenode servers manage multiple namespace.
YARN does cluster resource management and processing is done using different processing models.

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Q2440. Difference between group and cogroup?

Apache Hadoop

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Q2441. What is the use of final String when Strings are immutable ?

Core Java

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Q2442. What is Entity in hibernate?

Hibernate

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Q2443. Can you explain spring boot project Architecture?

Spring Boot

Ans. The architecture of a Spring Boot project can be divided into three layers:

Presentation Layer:
This layer is responsible for handling user requests and generating responses. It includes the user interface, which can be a web UI or a RESTful API. Spring Boot provides various options to develop web applications, such as Spring MVC, Thymeleaf, and others.

Service Layer:
This layer contains the business logic of the application. It is responsible for processing the user requests and generating responses. The Service Layer interacts with the Data Access Layer to fetch and store data.

Data Access Layer:
This layer is responsible for interacting with the database or any other external data source. It includes the database model, repositories, and data access objects. Spring Boot provides support for various data access technologies, such as JPA, JDBC, and Spring Data JPA.

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Q2444. Without configure ContextLoaderListenerAnd DispatcherServlet how to run spring MVCApplication?

Spring

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Q2445. Which angular library needs to be included for Angular Routing / Views ?

Angular Js

Ans. @angular/router

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Q2446. What are the things that need to be configured for creating route / views in angular ?

Angular Js

Ans. Path
View Name
Component

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Q2447. Can we have multiple path maps to the same component ?

Angular Js

Ans. Yes

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Q2448. Difference between Route and Redirect ?

Angular Js

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Q2449. What is type script ? What are the advantages of typescript ? How is it different than javascript ?

TypeScript

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Q2450. Difference between constructor and NGInit ?

Angular Js

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Q2451. How can we give input to the component ?

Angular Js

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Q2452. How can we make http sever calls from within angular ?

Angular Js

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Q2453. How can we achieve 2 way binding ?

Angular Js

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Q2454. What is a service class ?

Angular Js

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Q2455. What is the scope of Service class ? Do we need to add it to declaration or imports or providers to be made available to the component ?

Angular

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Q2456. Difference between git init and git clone ?

Git

Ans. "git init" creates an empty repository or can make an existing directory a git repository while "git clone" first internally calls "git init" to create an empty git repository and then copy the data from the specified remote repository.

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Q2457. What is the purpose of rebasing the branch

Git

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Q2458. Define Collection

Core Java

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Q2459. Why angular apps are called single page applications ?

Angular Js

Ans. In Angular Apps, route between pages are performed without rendering the entire page. Url changes are done through routing. Routing in AngularJS is implemented by including <ng-view> or <ui-view> in the index.html page without refreshing the entire page

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Q2460. What is reentrant lock ?

Ans. A reentrant lock is a mutual exclusion mechanism that allows threads to reenter into a lock on a resource (multiple times) without a deadlock situation.

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