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Q1141. What is an IP address ?

Java EE

Ans. An Internet Protocol address is a numerical label assigned to each device participating in a computer network.

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Q1142. There is a Table Student having Student Id, Name and Total Marks. Can you please write an SQL that will display the maximum marks obtained by a student ?

Database

Ans. SELECT MARKS FROM STUDENT ORDER BY MARKS DESC LIMIT 1;

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Q1143. In case of a synchronized method, Does the method only gets locked or the whole object ?

Core Java

Ans. Just the method gets locked.

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Q1144. Can you assign value to a static final type at runtime ?

Core Java

Ans. No

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All these acronyms JDK,JRE,JVM etc are very frequently asked.

Q1145. Difference between JDK and JRE ?

Core Java

Ans. JRE or Java Runtime Environment is the Java Virtual Machine on which class files are executed. It includes borwser plugins that facilitates execution of class files in browsers.

JDK or Java Development Kit includes JRE , compiler and development tools.

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Q1146. Is New Keyword a method Name ?

Core Java

Ans. No, Its an Operator.

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Q1147. Is a method name same as Class name permissible in Java ?

Ans. Yes, But the method should have some return type as otherwise it will be treated as a constructor.

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Q1148. What is CRUD ?

Database

Ans. CRUD stands for "Create, read, update and delete" are the basic functions of persistence.

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Q1149. If you are given a choice to have a functionality shared either through dependency or through a Web service, which one will you choose ?

Solution

Ans. Web Service promotes looser coupling but with comes with coding and performance overheads. Jars provide better performance and may be lesser coding but are problematic with update distribution. If the situation doesn't require frequent dependency updates and if it's only read operation of persistence, Having dependencies should be a better choice , otherwise web service.

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Q1150. What are the disadvantages of running multiple apps in single JVM ?

Core Java

Ans. 1. Issue with Jar and ClassPath Conflicts

2. Killing JVM will terminate all applications

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Q1151. How does the String Class stores the string in memory ?

Core Java

Ans. It stores the string as a character array with 2 bytes for each character.

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Q1152. What is DTO ?

Ans. DTO is Data Transfer Object i.e Pojo which is supposed to move between different layers of software architecture for transferring information. Example could be the object passed from client in case of web service call or the object passed to Persister for Database Persistence.

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Q1153. What is DAO ?

Ans. DAO is Data Access Object which is used within Persistence Layer to make Database Transaction. For example , the class holding the Database connection and CRUD methods.

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Q1154. What is POJO ?

Ans. POJO is Plain Java Object that holds only Member Elements , getters are setters and minimal processing on that. The primary purpose of such object is to either transfer information or keeping state for a while. They are not intended to provide any processing or transformation.

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Q1155. What are VO ?

Ans. VO or Value objects are the objects that are supposed to hold some value. For Example , Integer, Float , Money etc.

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Q1156. Can we declare a main method as abstract ?

Ans. No. Static methods cannot be overridden and hence make no sense to be declared abstract.

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Q1157. How do you manage source code in repository if you have multiple releases lined up and different teams are working on it?

Tools

Ans. We creates separate branches for each project if development work is going on parallel and they are to be released at different times. Once the first release is done, we merge the branch changes into trunk. If they all have to go at one time, we usually would merge everything in the trunk itself.

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Q1158. Is it advisable to just hold checking in your changes to trunk if there is another release planned in between ?

Ans. If it's just smaller change, and single person is working, then this approach is fine. Otherwise there are risk on loosing it on your machine. Moreover , If there are multiple people working , it makes it hard to share code. It's better to create a separate branch and then merge it later to trunk.

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Q1159. What are the steps to create a branch in SVN ?

Ans. If the branch is to be created from Trunk and we are using Eclipse.

Go to the Trunk Copy of the Project

Right Click the project and then Click Branch/Tag

In the Create Branch / Tag Dialog, Add the Destination Branch Url

Check whether we want to make copy from the Head Revision or some specific revision Number

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Q1160. If you are supposed to deprecate the method , Will you deprecate the method in the implementation class or will you deprecate the abstract declaration within interface or abstract class ?

Ans. Deprecating the interface / or declaration doesn't make much sense as the implementation is deprecated and not the interface.

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Q1161. What is multilevel inheritance ?

Core Java

Ans. Multi Level Inheritance is multi level hierarchy of classes. Here is the example - http://www.buggybread.com/2015/09/java-se-class-diagram-classes-that_603.html

Class RoleList extends ArrayList which in turn extends AbstractList which in turn extends AbstractCollection.

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Q1162. When do we generally get the database error - Unique Constraint Violated ?

Ans. This error can result either on an insert, update or delete when any change in data results in duplicate record or subset of it having unique constraint on record or its subset. For example - If we have a unique constraint on a combination of columns and then trying to insert duplicate column values.

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Frequently asked for Lead and Architect positions. Recently asked in many US companies.

Q1163. What are Anti Patterns ?

Design

Ans. Anti-pattern is simply the creation of a pattern in your coding that negatively affects your code i.e the Negatives surpasses the positives.

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Q1164. What are some alternates to keeping Audit Tables ?

Database

Ans. Audit Tables generally stores Raw information to be reviewed in case of problems or determining impact. If Database space is an issue , and the audit information is rarely retrieved, one design could be to use compressed file system.

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Q1165. What is the purpose of Commit and Rollback in Databases ?

Database

Ans. When a DML is executed, the changes only stays in session and still not pushed to DB Tables, Commit is used to push those changes to the Tables.

In case we realize that we don't want to commit those changes and would like to ignore them, we can use rollback.

For example - You may like that for a banking transaction you would like to update the account balance only if the debit or credit record was correctly inserted, so you may like to encapsulate both DML's - insert for transaction and update for balance in a single transaction and would only commit if both succeeds else rollback.

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Q1166. Can I run a java program without creating any class ?

Ans. No, It requires creation of atleast one Class. Creating an object of that class is not compulsory as we can write all our logic within main method which is static.

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Q1167. What is a static variable in Java ?

Core Java

Ans. It is a class level variable that is shared among the objects of that class.

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Q1168. What is "Instance Initializer block" ?

Ans. Instance Initializer block is used to initialize the instance data member. It run each time when object of the class is created.

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Q1169. What is the difference between constructor and instance initialization blocks ?

Core Java

Ans. Constructor has the same name as class name whereas instance initialization block just have a body without any name or visibility type.

instance initialization blocks are useful if we want to have some code run regardless of which constructor is used or if we want to do some instance initialization for anonymous classes.

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Q1170. Is this code legal in Java ?

public class BuggyBread {
{
System.out.println("HelloWorld.");
}
}

Ans. Yes, It's an instance initialization block.

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