Updated 2018 Interview Questions and Answers for Java Development Services

The Java platform is one of the open source, independent, most preferably technology and global standard for the implementation of every kind of app, like web based, client-server, cloud and enterprise apps. These days, organizations are adopting Java app development to minimize costs, boost services and drive innovation in programming languages for enterprise engineering and architecture.

The demand for Java app development continues to rise. With this, the demand for Java programmers are also very high. Australia Java developer jobs are plentiful since a lot of organizations, both locally and internationally are seeking out their services. A business organization and an aspiring app developer should be aware of the skillsets as well as what being a Java developer entails.


A Java developer is responsible for programming and developing apps and software with the use of the popular language, Java. Furthermore, the developer is a specialized kind of programmer who might collaborate with software engineers and web developers to integrate Java into business apps, websites and software. They are involved all throughout the entire development life cycle of a product and should be able to identify as well as analyze problems or issues and should be able to come up with an efficient solution. Other duties could include gathering and documenting the requirements of a user, analyze data and quality assurance testing. The Java developer role is an in-demand role at present.

For companies seeking the services of a Java programmer or hiring one, it’s important to be have ready questions and answers that will reveal the extent of the knowledge of an applicant or prospective development partner.


What is JVM? The Java interpreter, together with a runtime environment that’s required to run the Java app is called the JVM or the Java Virtual Machine.
What’s the most important Java feature? It’s being a platform independent language.
What does platform independence mean? It means that one could write and compile Java code in a single platform, such as Windows for instance and could execute the class in any other platform supported, like Linux and more.
What’s the base class of all classes? The java.lang.Object
What are the access modifiers? There are three access modifiers, namely, public, protected and private. The default one if there is no specified modifier is called friendly, but programmer could not explicitly specify the friendly identifier.
What’s the difference between a JVM and a JDK? The JDK is the Java development kit, used for the development purpose, which includes an execution environment as well. But the JVM is purely a run time environment and thus, one would not be able to compile the source files using it.
What is a package? It’s a collection of related interfaces and classes that provide access protection and namespace management.
What does Inheritance mean and its advantages? Inheritance is a process of inheriting all feature from a class. The advantages are code reusability and variables accessibility and methods of super class by subclasses.
The difference between superclass and subclass? Superclass is class inherited, whereas the sub class does the inheriting.
What is synchronization? It’s the mechanism that ensures that only one thread at a time is accessed.
What’s an abstract class? It’s a class designed with implementation gaps for subclasses to fill in and is made incomplete deliberately.
What’s a deadlock? Deadlock is when two threads are waiting each other and could not precede the program.
What are states associated in the thread? Thread contains the states ready, running, waiting and dead states.
What’s an applet? An applet is an interactive and dynamic program, which runs within a web page displayed by a Java capable browser.
What’s the applet lifecycle?
init() method – could be called when an applet’s first loaded

start() method – could be called every time an applet is begun

paint() method – can be called when an applet is maximized or minimized

stop () method – could be used when a browser moves off the page of the applet

destroy() method – may be called when a browser is done with the applet

What’s a layout manager and what are the different kinds of layout managers that’s available in Java AWT? A layout manager is an object used for organizing components in a container. The various layouts available are BorderLayout, FlowLayout, CardLayout, GridLayout as well as GridBagLayout.
What is the JDBC? It is a set of Java API to execute SQL statements. The API consists of a set of interfaces and classes to allow programs to write pure Java Database apps.
What is a stored procedure? Stored procedure is a cluster of SQL statements, which forms a logical unit and does a certain task. Stored Procedures are used in encapsulating a set of queries or operations to execute on database. Stored procedures could be compiled and executed with various results and parameters and could have any input/output parameters combination.
How does one set security in applets? With the use of setSecurityManager() method.
What are the available drivers?
JDBC-ODBC Bridger driver
Native API Partly-Java driver
JDBC-NET Pure Java driver
Native-Protocol Pure Java driver
On the whole, a Java developer could directly use Java to write desktop GUI apps, web apps as well as mobile apps. The versatility and flexibility make it a general-purpose programming language in the truest sense possible. At the same time, Java frameworks and development tools contribute greatly to making Java one of the most popular programming languages of all time. Thus, a lot of small businesses also use it for application development. The features would further keep the relevance of Java intact for a long period of time.

Email Marketing For Indian Android App Developers

What is Email Marketing?

Email Marketing is a type of direct marketing that helps brands to interact with a large database of audience in an effective, affordable, and time saving way.

The emails could contain a whole host of communications on app features and benefits, information on what the app is about, deals or promotions.

Benefits of Email Marketing

Increased growth:

When the customers receive a message from an Indian app developer about a new app or product then this can increase the sales of the product or service.

Your app stands out:

It is important to keep the app in the fore front of the client’s mind through email marketing. An Indian app developer wants their app to stand out so that users will potentially take notice and possibly purchase.

Great contact:

If an Indian app developer sends their message to a particular client or customer this can allow helpful contact and relationships with these clients or users. Email marketing has the capability to make that objective real. On a consistent basis of doing contact with clients, this provides confidence to them to purchase.

Establishes Authority:

This marketing can provide set up authority. Indian app developers may like to explain the ins and outs of their app to the client or user. Emails can show the information without coming across as bragging.

Provides and establishes nurtured relationships through email:

Indian app developers need to depend on those to whom they trust. It is just natural. Trust is an important part of a success of any business. Making use of emails to create and provide a nurtured connection with users. Remember that emails are an effective grip or a conversation among Indian app developers and the users. Emails help to build trust and a reputation.

Sets a tone:

Emails can help set a tone for the Indian app developers reaching out to their clients letting them know what the app is about, what it provides, the great features about it, how it can benefit the users and their needs.

Email campaign automation:

In of itself this brings additional techniques to engage and nurture the app users, especially those who have disabled push notifications.

Help launch the app:

Indian app developers can get a feel of how email marketing can provide the word of mouth to get an app launched. Through emails more people acquire the information in a short amount of time.

Increase the rate of app user acquisition:

This type of marketing can even provide a greater rate of app users and in return more growth and or sales. In-app messaging engages the current users or less frequent users. Email is a good way to establish continual app improvement.

Now that we have that covered, we can focus on having a plan before marketing.

Pick An Email Provider

Do the research, especially new email marketers. Choose from the many services that create and run email campaigns. Maybe find out from other developers of providers that they use. The most cost effective one does not necessarily mean it is the best option. Always do your research and shop around and try a couple trial campaigns. The benefit of this marketing is that it is generally quick and easy.

Create A Pre-Launch Page

Having a simple pre-launch page is critical. Just a few details about the app with some art that flows with the theme of the app. Do not forget an email subscription form. Keep in mind, if visitors like the concept to the website, then they will be more than willing to sign up for updates and find out when your app will launch. Word of mouth at this time is important as well. Your pre-launch subscribers will be your most valuable and likely to spread the work of the set launch date.

Even providing an inviting incentive to sign up, as a subscriber is a plus. The purpose of this page is to get visitors to sign up to the mailing list. Another way of gaining more email addresses for future email marketing campaigns.

Include An Email Subscription Form To The App

Do not worry, this may boost the ongoing marketing efforts by creating a subscription form to the android app itself. In addition, developers may want to collect email addresses to let clients know about updates.

Try Other List-Building Tactics

In addition to the pre-launch page and subscription form to your app, Indian app developers can do the following options:


When attending events like developer meetups or technology conferences, gather email addresses from attendees as yourself. Actually, almost every email provider comes with a customizable mobile app to collect email addresses.

Offer teaser content: – This can be offered via a blog or video, i.e. concept art or posts on what was learned while developing the app. Add a subscription form onto the company blog posts or video.

Offer a discount:

If the app is a paid app, then the developer can offer a nice discount to early adopters – if they agree to subscribe to the email newsletter. Providing an incentive is attractive to some people, especially when it benefits them and in return in benefits the developer of the app.

Using An App to Create Your Campaign

Okay, you have acquired several email addresses. Now it is time to create the email campaign. There are android apps that can take all the guesswork out. Creating more time for the developer to do more important things.


Allows you to create campaigns directly from your android at any time and at any place you need to. This allows for easy to design stunning emails with a workflow that is not like the one already known from the web. There is direct access to additional file managers. Updating the campaign content or basic settings is simple.

Your Investment Plan Checklist: What you need to know before investing in Forex trade

A number of people want to place their additional earnings into something productive that is capable of providing them Return on Investment. Forex trading could be one of the most secure ways for investment. However, it should be noted that before investing it is always crucial to have a practical investment plan. You can consult a financial advisor or an experienced professional of the trade for some tips and insight on this plan. The advice from a financial advisor or experienced professional will help you in setting your investment path straight and minimise the likelihood of financial loss. If you are hoping to make some money through forex trade then you need to set yourself up with a good plan. Your financial adviser and trade expert can help you in creating an effective forex investment plan checklist. The purpose of this checklist or plan is to make yourself aware of a series of steps that should be followed to manage your investment as wisely as possible.

We’ve put together some expert tips on how you can create your own investment plan or checklist before investing in forex trade:

Make a list of currency pairs that you will use initially to test trading. Forex trading usually revolves around a number of currency pairs. While you are testing on these pairs, you will eventually get to know which currency pair or pairs would work better for you. This allows you to see what pairs will give you the results you’re after. You can then continue trading in these pairs until a new currency pair starts rising with a better return on investment.
Considering multiple indicators is necessary while trading. Therefore, you should record or jot down the indicators you will be using to know the trends in forex exchange. In addition to recording indicators, also record the settings that you are using for forex trading. This will help you in knowing which settings worked better for your trading. You should also figure out the most reliable indicators for your trading. These indicators will help you a lot in earning a greater return on investment. If you are trading based on the direction of almost any indicator, it will work for you initially but there are high chances of incurring a loss eventually. Therefore, it is absolutely necessary that you are following one of the most reliable indicators that worked well for your trade.
Don’t follow the strategy of trading at just any time of day or night. First, try test trading during multiple specific time frames. Then make a list of time frames that worked well. Now is the time to choose one or two most profitable time frames in order to earn good ROI. Don’t rely on hearsay for your investment, you should seek the best time frame for your forex trading to get the most out of your forex trading venture.
You should define your % risk per trade ratio that you have figured out during test trading. This is critical, you will notice that the same trading systems will behave differently if you are risking multiple amounts per trade. The best option is to start with a 1% risk per trade, then reshape your strategy on the basis of less or more risk and select the one which suits you.