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

Interview Questions and Answers - Order By Newest

Q1631. Can we call a constructor for an object twice ?

^{This question is still unanswered. Can you please provide an answer.}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve constructor}

Q1632. What is the difference between Stack and Queue ?

Data Structures

Ans. Stack is based on Last in First out (LIFO) principle while a queue is based on FIFO (First In First Out) principle.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve data structure stack vs queue stack queue Basic}

Q1633. Can we compile and execute a Java class without main method ?

Core Java

Ans. No without main method can not be executed it will throw an error illegal start of type. Main method is the entry point of application.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve jvm compilation main method Basic}

Q1634. What is the purpose of re throwing the exception when we can provide the handling at the first catch itself ?

Core Java

Ans. Sometimes the calls move across layers of classes and functions and hence each layer needs to perform some function like cleaning if something goes wrong deep inside.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve exceptions exceptions handling rethrowing exception}

Q1635. What is the problem we could face if we be very liberal with importing classes even if we are not using them ? For example

import java.util.*;
import java.io.*;

Core Java

Ans. It makes application little heavy as we are importing classes that aren't required.

It creates class name conflicts as similar name classes might be available across different packages. In case of such conflicts, we will have to specify the package name with the class name at the time of it's usage.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve import statement java import}

Q1636. Which java package is loaded by default and hence doesn't require an explicit import statement ?

Core Java

Ans. java.lang

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java.lang import statement basic}

Q1637. How do we define constant variables in Java ?

Core Java

Ans. By using static and final modifiers.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve constant variables static final basic frequent}

Q1638. Can a source file contain more than one class declaration ?

Core Java

Ans. Yes, but only one of them can be declared public.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve class declaration}

Q1639. Can an interface be defined inside a class just like we can have inner classes inside a class ?

Core Java

Ans. Yes , we can have an interface that is part of a class.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve inner classes inner interface nested classes}

Q1640. Can an interface implements another interface ?

Core Java

Ans. No. No interface provides any implementation and hence the declaration isn't viable.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve interface basic}

Q1641. Why doesn't java support operator overloading ?

Core Java

^{This question is still unanswered. Can you please provide an answer.}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve operator overloading}

Q1642. What are the different ways in which dependency injection can be done using Spring Framework ?

Spring

Ans. Using Constructor and Setters.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve spring dependency injection inversion of control}

Q1643. Difference between constructor and setter injection ?

Spring

Ans. 1. In Setter Injection, partial injection of dependencies can possible, means if we have 3 dependencies like int, string, long, then its not necessary to inject all values if we use setter injection. If you are not inject it will takes default values for those primitives1. In constructor injection, partial injection of dependencies cannot possible, because for calling constructor we must pass all the arguments right, if not so we may get error

2. Setter Injection will overrides the constructor injection value, provided if we write setter and constructor injection for the same property [i already told regarding this, hope you remember ] But, constructor injection cannot overrides the setter injected values

3. If we have more dependencies for example 15 to 20 are there in our bean class then, in this case setter injection is not recommended as we need to write almost 20 setters right, bean length will increase. In this case, Constructor injection is highly recommended, as we can inject all the dependencies with in 3 to 4 lines [i mean, by calling one constructor]

4. Setter injection makes bean class object as mutable [We can change ] .Constructor injection makes bean class object as immutable [We cannot change ]

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve spring dependency injection inversion of control Asked in 3 Companies}

Q1644. Difference between ApplicationContext and BeanFactory ?

Spring

^{This question is still unanswered. Can you please provide an answer.}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve ApplicationContext BeanFactory ApplicationContext vs BeanFactory frequent}

Q1645. What are some limitations or dis advantages of Auto Wiring ?

Spring

Ans. Autowiring a class of the same type throws an exception.
We can user @Qualifier to overcome this.
Autowiring cannot be used for primitives.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve spring autowiring spring auto wiring}

Q1646. What are the types of transaction management supported by Spring ?

Spring

^{This question is still unanswered. Can you please provide an answer.}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve spring spring transaction management}

Q1647. What are the different types of advices in AOP ?

Spring

^{This question is still unanswered. Can you please provide an answer.}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve spring app spring aspect oriented programming}

Q1648. What is the use of upcasting in Java ?

Core Java

Ans. Interfacing

Car extends Vehicle

Car car = new Car();

// now you need to call an API changeTires() which can change tires for all Vehicle Types and accepts argument of type Vehicle and hence you will have to upcast it

changeTires((Vehicle)car);

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve upcasting type casting}

Q1649. Why do we pass an array of strings to main method ?

Core Java

Ans. Array of strings in the main method are the list of arguments or parameters which are sent to the application / program.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve main method main method string array argument}

Q1650. In Java, what is the closest thing to pointers?

Core Java

Ans. References.

Unlike pointers in C , Java references are strongly typed and we cannot do pointer arithmetics with them.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve pointers pointers in java references Asked in 1 Companies}

Q1651. In Java, would you like to see an explicit destructor?

Core Java

Ans. Yes , a gc method to explicitly call garbage collection immediately on the object. It will provide better flexibility over application that require optimal usage of memory.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve destructor garbage collection Asked in 1 Companies expert}

Q1652. How to calculate lcm of two numbers ?

Core Java

^{This question was recently asked at 'HCL Tech'.This question is still unanswered. Can you please provide an answer.}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve coding code Asked in 1 Companies}

Q1653. Write a Program to find age by birth date ?

Core Java

Ans. LocalDate today = LocalDate.now();
LocalDate birthday = LocalDate.of(1960, Month.JANUARY, 1);
Period p = Period.between(birthday, today); //Now access the values as below
System.out.println(period.getDays());
System.out.println(period.getMonths());
System.out.println(period.getYears());

Sample Code for LocalDate

Sample Code for Period

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve coding code date LocalDate Period Asked in 1 Companies}

Q1654. What is a session bean ?

Java EE

^{This question was recently asked at 'BirlaSoft'.This question is still unanswered. Can you please provide an answer.}

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve session bean java bean Asked in 1 Companies}

Q1655. Explain Inheritance and Polymorphism.

Core Java

Ans. Getting parent class object properties into child class is called Inheritance.

The process of representing one form into multiple forms is called polymorphism.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve inheritance object oriented programming (oops) oops concepts polymorphism object oriented programming (oops) oops concepts Asked in 1 Companies Basic frequent}

Q1656. If Table A has 100 records and Table B has 50 records , how many records will the equi join of Table generate ?

SQL

Ans. It depends on the join condition.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve equi join sql join database sql}

Q1657. If Table A has 100 records and Table B has 50 records , how many records will the left join of Table A with Table B generate ?

SQL

Ans. 100 records

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve database sql sql joins left join}

Q1658. If Table A has 100 records and Table B has 50 records , how many records will the right join of Table A with Table B generate ?

SQL

Ans. 50 records

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve database sql sql joins right join}

Q1659. If Table A has 0 records and Table B has 50 records , how many records will the equi join of Table generate ?

SQL

Ans. 0 records

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve database sql sql joins equi join}

Q1660. What will be the output of following code

class TestMain {
public static void main(String[] args) {
String s1 = "ravi";
String s2 = new String("ravi");
Integer i = 10;
Integer a1 = new Integer("10");
System.out.println(s1 == s1);
System.out.println(i == a1);
}
}

Core Java

Ans. false
false

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve object equality == coding code Asked in 1 Companies}

Search Interview Questions

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.