Interview Questions and Answers for 'T' | Search Interview Question

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Q2111. Will it print the message in Base Class constructor if we execute main method of Main class ? why ?

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

public class DerivedClass extends BaseClass{
}

public class Main {

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

Core Java

Ans. Yes.

When the Derived class constructor is initialized , a no argument super will be called intrinsically.

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Q2112. What will the following print upon executing main method of Main class ?

public class BaseClass {
BaseClass(){
System.out.println("Hello I am in Base Class 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 Constructor
Hello I am in Derived Class Constructor

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Q2113. What will the following code print upon executing main method of Main class ?

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

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

super();
}
}

public class Main {

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

Core Java

Ans. There will be compilation error within constructor of Derived Class as "super must be the first statement in constructor body".

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Q2114. What will the following code print upon executing main method of Main class ?

public class BaseClass {
BaseClass(int x){
System.out.println("Hello I am in Base Class 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. Compilation error as there is no default constructor available in BaseClass.

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Q2115. What will the following code print upon executing main method of Main class ?

public class BaseClass {
BaseClass(int x){
System.out.println("Hello I am in Base Class 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 Constructor
Hello I am in Derived Class Constructor

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Q2116. 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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Q2117. 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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Q2118. Why string pool concept has been introduced in string ?

Core Java

Ans. Memory Sharing and Optimal memory utilization.

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Q2119. Write a Program to Find the maximum sum of the sub array ?

Data Structure

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Q2120. Explain In place sorting algorithm ?

Algorithm

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Q2121. How can we check class file format in java ?

Core Java

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Q2122. What are the benefits of Junits ?

Junit

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Q2123. What is the use of final String when Strings are immutable ?

Core Java

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Q2124. What is Entity in hibernate?

Hibernate

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Q2125. 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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Q2126. Without configure ContextLoaderListenerAnd DispatcherServlet how to run spring MVCApplication?

Spring

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Q2127. Is it possible to configure more than one config file in struts ?

Struts

Ans. Yes

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Q2128. Difference between Let and Var ?

TypeScript

Ans. Let creates a variable with a local scope whereas var creates it with a global scope.

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Q2129. What are the different data types in typescript ?

TypeScript

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Q2130. Difference between interface and type ?

TypeScript

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Q2131. Difference between interface and class in typescript ?

TypeScript

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Q2132. Why type has been deprecated and replaced by interfaces ?

TypeScript

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Q2133. Can we set specific return type of a method in typescript ?

TypeScript

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Q2134. What is the use of map method in typescript ?

TypeScript

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Q2135. What is type script ? What are the advantages of typescript ? How is it different than javascript ?

TypeScript

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Q2136. What are the features of TypeScript ?

TypeScript

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Q2137. How to compile typescript ?

TypeScript

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Q2138. Can we compile multiple type script files together ? How ?

TypeScript

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Q2139. Difference between constructor and NGInit ?

Angular Js

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Q2140. 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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