Question 1

What role does Dalvik play in Android development ?

Accepted Answer

Dalvik serves as a virtual machine, and it is where every Android application runs Through Dalvik, a device is able to execute multiple virtual machines efficiently through better memory management

Question 2

What are intents, shared preference in android ?

Accepted Answer

An Android Intent is an abstract description of an operation to be performed It can be used with startActivity to launch an Activity, broadcastIntent to send it to any interested BroadcastReceiver components, and startService(Intent) or bindService(Intent, ServiceConnection, int) to communicate with a background ServiceThe intent itself, an Intent object, is a passive data structure holding an abstract description of an operation to be performed Android provides many ways of storing data of an application One of this way is called Shared Preferences Shared Preferences allow you to save and retrieve data in the form of key,value pair In order to use shared preferences, you have to call a method getSharedPreferences() that returns a SharedPreference instance pointing to the file that contains the values of preferences

Question 3

What is passive topology?

Accepted Answer

When the computers on the network simply listen and receive the signal, they are referred to as passive because they don’t amplify the signal in any way Example forpassive topology - linear bus

Question 4

What is 255.255.255.255 used for?

Accepted Answer

Research

Question 5

List the steps involved in creating the checksum.

Accepted Answer

- Divide the data into sections - Add the sections together using 1's complement arithmetic - Take the complement of the final sum, this is the check sum

Question 6

What is a stub network?

Accepted Answer

A stub network has only one default path to non-local hosts and no outside network knowledge. Non-local stub network traffic uses a single logical path when traveling in and out of the network. Stub networks are essentially local area networks (LAN) that either do not connect to the outside and relay data packets internally or are dead-end LANs that know of only one network exit. Stub networks may have multiple connections but use one path to single points of destination. Hence, a stub network is a network that has only one entry and exit point.

Question 7

In OSI network architecture, the routing is performed by

Accepted Answer

network layer

Question 8

What are JAD sessions?

Accepted Answer

JAD (Joint Application Development) is a methodology that involves the client or end user in the design and development of an application, through a succession of collaborative workshops called JAD sessions The JAD approach, in comparison with the more traditional practice, is thought to lead to faster development times and greater client satisfaction, because the client is involved throughout the development process In comparison, in the traditional approach to systems development, the developer investigates the system requirements and develops an application, with client input consisting of a series of interviews

Question 9

How do you define a traceability matrix?

Accepted Answer

Traceability matrix is a cross matrix for recording the requirements through each stage of the requirements gathering process This matrix should also take into account any changes in the scope during the life of the project At the end of the project this matrix should show each function built into a system, its source and the reason that any stated requirements may not have been delivered

Question 10

Record set types and Number available in VB?

Accepted Answer

3 1- Dynaset, 0 Table, 2 Snap Shot

Question 11

What’s the difference between htmlentities() and htmlspecialchars()?

Accepted Answer

Htmlentities() converts all applicable characters to HTML entities While htmlspecialcharacter()converts special characters to HTML entities This means htmlentities( ) will check for non English language characters, such as French accents, the German umlaut, etc

Question 12

What is WATER MARK in oracle? Explain the significance of High water mark.

Accepted Answer

WATER MARK is a divided segment of used and free blocks Blocks which are below high WATER MARK ie used blocks, have at least once contained some data This data might have been deleted later Oracle knows that blocks beyond high WATER MARK don’t have data; it only reads blocks up to the high WATER MARK during a full table scan

Question 13

Which containers use a FlowLayout as their default layout ?

Accepted Answer

The Panel and Applet classes use the FlowLayout as their default layout

Question 14

How to identify a given positive decimal number as even/odd without using % or / operator ?

Accepted Answer

You may be very good at coding,but if you questioning how on earth you could solve this problemThen here is a solution If you remember the good old days of our primary school then the solution is easy,"division is a matter of iterative subtraction" public class TestEvenOdd { public static void main(String arg[ ]){ int num=6; int result=num; while(result>=2){ result=result-2; } if(result==1){ Systemoutprintln("The number is odd"); }else{ Systemoutprint("The number is even"); } } }

Question 15

Difference between Arraylist and Linked list?

Accepted Answer

ArrayList and LinkedList both implements List interface and maintains insertion order Both are non synchronized classes But there are many differences between ArrayList and LinkedList classes that are given below ArrayList V/s LinkedList :: 1) ArrayList internally uses dynamic array to store the elements Whereas LinkedList internally uses doubly linked list to store the elements 2) Manipulation with ArrayList is slow because it internally uses array If any element is removed from the array, all the bits are shifted in memory Whereas Manipulation with LinkedList is faster than ArrayList because it uses doubly linked list so no bit shifting is required in memory 3) ArrayList class can act as a list only because it implements List only Whereas LinkedList class can act as a list and queue both because it implements List and Deque interfaces 4) ArrayList is better for storing and accessing data Whereas LinkedList is better for manipulating data

Question 16

What is Spring IoC container ?

Accepted Answer

The Spring IoC is responsible for creating the objects,managing them (with dependency injection (DI)), wiring them together, configuring them, as also managing their complete lifecycle

Question 17

How can you avoid callback hells ?

Accepted Answer

There are lots of ways to solve the issue of callback hells: 1 Modularization: break callbacks into independent functions 2 Use a control flow library, like async 3 Use generators with Promises 4 Use async/await (note that it is only available in the latest v7 release and not in the LTS version)

Question 18

What is the difference between ViewState and SessionState?

Accepted Answer

'ViewState' is specific to a page in a session 'SessionState' is specific to user specific data that can be accessed across all pages in the web application

Question 19

What is immutable object? Can you write immutable object ?

Accepted Answer

Immutable classes are Java classes whose objects can not be modified once created Any modification in Immutable object result in new object For example is String is immutable in Java Mostly Immutable are also final in Java, in order to prevent sub class from overriding methods in Java which can compromise Immutability You can achieve same functionality by making member as non final but private and not modifying them except in constructor

Question 20

Which of the following are incorrect form of StringBuffer class constructor ?

Accepted Answer

StringBuffer(int size , String str)

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