Interview Questions

Q:

What is JDBC ?

Answer

JDBC technology is an API (included in both J2SE and J2EE releases) that provides cross-DBMS connectivity to a wide range of SQL databases and access to other tabular data sources, such as spreadsheets or flat files. With a JDBC technology-enabled driver, you can connect all corporate data even in a heterogeneous environment.

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Subject: Java

0 2071
Q:

What is the use of API’s in cloud services?

Answer

API stands for Application programming interface is very useful in cloud platforms as it allows easy implementation of it on the system. It removes the need to write full fledged programs. It provides the instructions to make the communication between one or more applications. It also allows easy to create application with ease and link the cloud services with other systems.

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Subject: Cloud Computing

0 2070
Q:

Can we compile a java program without main?

Answer

Yes, we can. In order to compile a java program, we don't require any main method. But to execute a java program we must have a main in it (unless it is an applet or servlet). Because main is the starting point of a java program.

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Subject: Java

0 2070
Q:

What is the difference between "==" and "==="?

Answer

"==" checks equality only,
"===" checks for equality as well as the type.

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Subject: Web Technology

0 2069
Q:

What is the Set interface ?

Answer

- The Set interface provides methods for accessing the elements of a finite mathematical set


- Sets do not allow duplicate elements


- Contains no methods other than those inherited from Collection


- It adds the restriction that duplicate elements are prohibited


- Two Set objects are equal if they contain the same elements

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Subject: Java

0 2068
Q:

What are the various elements of OOPS?

Answer

Various elements of OOP are:


• Object


• Class


• Method


• Encapsulation


• Information Hiding


• Inheritance


• Polymorphism

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Subject: Java

0 2067
Q:

When should I use abstract classes and when should I use interfaces?

Answer

Use Interfaces when…


- You see that something in your design will change frequently.


- If various implementations only share method signatures then it is better to use Interfaces.


- You need some classes to use some methods which you don't want to be included in the class, then you go for the interface, which makes it easy to just implement and make use of the methods defined in the interface.


 


Use Abstract Class when…


- If various implementations are of the same kind and use common behavior or status then abstract class is better to use.


- When you want to provide a generalized form of abstraction and leave the implementation task with the inheriting subclass.


- Abstract classes are an excellent way to create planned inheritance hierarchies. They're also a good choice for nonleaf classes in class hierarchies.

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Subject: Java

0 2066
Q:

Give the sequence of execution of the various report triggers?

Answer

Before form , After form , Before report, Between page, After report.

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7 2065