Sorting Collections

Sorting of Java Objects in Collections is done in two ways.They are:

1)Implementing Comparable interface :

           Comparable Interface in java is used to define the natural sort order of a class.It is defined in lang package.Comparable interface provides one method "compareTo()" to implement in any class so that two instances of that class can be compared. compareTo() method compares the two object of the same type and returns a numerical result based on  the comparison.

In a Student list if we need to sort the list, based on the student roll no, its best  way to implement with Comparable interface.

Example :

public class Student implements Comparable {
private int rollNo;
private String firstName;
private String lastName;
// getter and setter for the properties
@Override
public int compareTo(Student s) {
return this.rollNo- s.rollNo;
}
}

Usage:
   List studentList=new ArrayList();
     //add student objects to studentList 
       Collections.sort(studentList);

2)Implementing Comparator interface :

          Comparator interface is used to order the objects of user-defined class.It is defined in util package.it provides multiple sorting sequence i.e. you can sort the elements based on any data member. Comparators can also be used to control the order of certain structures(such as TreeSet or TreeMap). For instance it may be rollno, name, age or anything else.             

This method is more like generics type if you have to sort with more option.

1) sort based on the firstNamne

2) sort based on the lastName

Example :

Sorting student collection by firstName.

public class FirstNameSorter implements Comparator{
@Override
public int compare(Student s1, Student s2) {
return s1.getFirstName().compareTo(s2.getFirstName());
}

} 

Usage:
List studentList=new ArrayList();
     //add student objects to studentList 

       Collections.sort(studentList, new FirstNameSorter());

Sorting student collection by lastName.

public class LastNameSorter implements Comparator{
@Override
public int compare(Student s1, Student s2) {
return s1.getLastName().compareTo(s2.getLastName());
}
}

Usage:
     List studentList=new ArrayList();
     //add student objects to studentList 
    Collections.sort(studentList, new LastNameSorter());

JodaTime

Free, open-source Java library for working with dates and times

Supported Concepts
Instant
 “An instant in the datetime continuum specified as a number of milliseconds from 1970-01-01T00:00Z”
  Within Joda-Time an instant is represented by the ReadableInstant interface.
  There are four implementations of the interface provided.

 Instant - A simple immutable implementation which is restricted to the UTC time zone and is intended for   time zone and calendar neutral data transfer
 DateTime - The most commonly used class in the library, and an immutable representation of a date and time with calendar and time zone
 DateMidnight - Similar to DateTime and also immutable but with the time component forced to be midnight (at the start of a day)
 MutableDateTime - A mutable representation of date and time with calendar and time zone.

• Partial
 a partial date/time representation (subset of fields) with no time zone
• Interval
 “an interval of time from one millisecond instant to another”
• Duration
 “a duration of time measured in milliseconds”
• Period
 “a period of time defined in terms of fields, for example, 3 years 5 months 2 days and 7 hours”
• Chronology “a pluggable calendar system

Java telephonic round for onsite

Mostly onsite and offshore model.
Abstract class vs Interface
about Finally block
will Finally block excutes after return statement
difference between sendRedirct and forward method
use of filters

What is the use of ActionServiclet
wht is the use of ActionFrom

Why do you use joins?
different between inner join and left outer join
What are aggregate functions
having clause and group by.

TIBCO Product Overview

TIBCO products are designed to help organizations pursue and benefit

from initiatives in three key areas: service-oriented architecture (SOA), business

process management (BPM), and business optimization.

SOA and Integration

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TIBCO ActiveMatrix® Policy Manager: is a policy management solution that enables IT to define, distribute, and enforce rules for security, auditing, logging, service levels, and other application characteristics across a wide range of services built on Java and .NET, as well as custom and packaged applications.

TIBCO ActiveMatrix BusinessWorks™: is a standards-based service creation, orchestration, and integration product built to run natively with other ActiveMatrix products. It enables companies to expose existing systems as services, build new services, and orchestrate and assemble services into more flexible applications with little or no coding.

TIBCO ActiveMatrix® Service Performance Manager: is an enterprise software platform that monitors and proactively manages the health and performance of IT and business services based on service level agreements.

Enterprise Service Bus

TIBCO ActiveMatrix® Service Bus: is an enterprise service bus that enables IT to mediate services in a flexible and reliable manner in any heterogeneous environment.

Application Integration

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Business Process Management

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Android Application Development Setup with Eclipse

Step1: Install Android SDK

Download Android SDK exe file from the below link and install it.

http://developer.android.com/sdk/index.html

Step2: Install eclipse plugin for Android Development Tools (ADT) using the below link.

https://dl-ssl.google.com/android/eclipse/

Step3: Configuration

Give Android SDK installation path to eclipse:

Window-->Preferences-->Android

Give the path in the SDK Location and click on apply.

Step4: Create Android Emulator Device.

Windows-->Android SDK and AVD Manger.

Select Virtual Devises and click New.

enter the details like below.

click on create AVD.

your done with setup to develop android applications.

Coding Convention in Java

1. Proper Names

• Should give correct spellings
• All meaningful names should have to give. Method should have to do same or more what they say..
• Try to Avoid abbreviations.
• Don't give java keywords as variable and method names
• Package name should be lower case.
• Ex: com.challa.action

Web Services Interview Questions and Answers

What is Web Services.

Web Services is Type of interaction between the applications helping their features each other.

Ex: Application A performs addition of two numbers and application B performs multiplication of Two Numbers. Application B required the feature of adding two numbers instead of implementing the same feature in Application B send the numbers to application A and get the result.

What is the use of Web Services or Why you should use Web Services

May be these tips can convince the client.

Web Services make use of developed application.

Reduce the cost for development and maintenance of the application.

Web Services can make easy integration.