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.

Why mobile app development is going micro?

But why is it that we all have to go mobile? As a business executive, you have realized that to get to the customer fast, you have to come up with applications that run on smartphones to raise your revenues progressively. This trend of mobile app development exerts more pressure on small businesses to leverage their growth through mobile application development.

Once a technological shift starts, it is hard to change it. When you look at the applications that are being developed in business, everything is being centered on mobile apps. Business executives are forced to change their strategies from the traditional ways to incorporate mobile solutions for all their services. These changes and variations that are implemented in business can increase the returns of business once they are deployed well.

What are Micro Apps (MA)
The number of apps that have been developed since 2008 when Android and iOS began range to millions. Even though apps have been churned out in numbers, there has been a change in how mobile app development works, and how apps are packaged. Native apps are difficult to use, and they usually feel bloated. ‘Micro apps’ is the new way that is on the rise. Micro apps ideally have a single purpose, a simple user interface; they are HTML based, they load dynamically bypassing app stores, and they load into communication tools like slack and FB Messenger.

What are Micro Services (MS)
To achieve immediate results, a microservice is used as the central unit that integrates multiple systems, solving any kind of problems. An MS counters the prolonged endeavors that are seen in interoperability between applications. Some companies like GE implemented SOA, but other companies have failed to implement it. Microservices are self-contained, atomic services that work on a single operation. MA’s have become a trend in the current business landscape because they are easy to use, they can propagate like mushrooms, and they can call several external and internal microservices.

What are Micro Flows (MF)
Human to machine interaction is the domain for microflows. Tools used in business process management help organizations to implement automation of business processes in a top-down approach. These systems are expensive, and they take a lot of time to deploy. When microflows come to the picture, they are easy to use, flexible to work with and they are convenient enough especially when it comes to integrating contributors to a macro workflow.

When using MF’s, you don’t have to use complex legacy systems to solve a business issue. The current generation z are shocked at the number of complicated systems that are used by global companies. You should think like millennials who opt for of more natural ways of delivering results in business processes. For instance, managers can work better with microflows when it comes to approvals, instead of logging into a system. Microflows make business executives interact easily with several systems using a single interface.

This is not the time to find the perfect name for your mobile app or spending more time coming up with promotion strategies because the new development is ready to go live and deliver results. Gone are the days when mobile app developers are stuck to the old mobile application development trends. The combination of microflows, micro apps, and micro-services builds on each other to come up with a new generation of apps that both company executives and mobile app developers can use.

Mobile Application Development Platform for Your Enterprises

There is a skyrocketing demand for Mobile Application Development Platforms. This is because of the boost in productivity and efficiency that enterprise mobile apps provide to the organizational processes and profitability. Besides, enterprise mobile apps optimally enhance employee performance. Automation of processes by means of enterprise apps saves time and reduces production costs.

Here are some facts and figures to give you a clearer picture of the current market scenario:

64% of all decision makers check their email on a mobile device.The number of existing enterprise mobile apps will multiply by four by next year.33% of all large corporate houses will come up with their own app store in a couple of years.35% of large business organizations are going to be leveraging Mobile Application Development Platforms to produce mobile apps by the next year.

For the rest of this blog, some guidelines for choosing and using a Mobile Application Development Platform are provided.

Guidelines for Using MADP for Enterprise Mobile App Development

User experience becomes a high priority.The company’s app development team must not lose its focus on user experience even for a moment during the process of producing an enterprise app using a Mobile Application Development Platform. User interface and user experience (UI/UX) must feature at the fore of the process of app creation using a Mobile Application Development Platform. This will require a lot of research into what users’ expectations are should inform the design of how the app looks, feels, and generally, works.

Research the nature and background of the company thoroughly.For enterprise mobile apps which are to be used internally, information and understanding of the nature of work the company is concerned with are vital to the process of app development using a Mobile Application Development Platform. In order for your enterprise app to be successful, you would need to be aware of the company’s specific goals and requirements. The development process will then have these requirements at its core. The rapid app development process used by a Mobile Application Development Platform can customize apps to suit the company’s needs.

Make realistic estimates.Assess your needs for app development with a Mobile Application Development Platform carefully and constantly. This is crucial to the non-linear rapid app development model followed by Mobile Application Development Platforms. Although the process is accommodating and flexible, it is best to steer clear of unforeseen hindrances. Make clear predictions and be as precise with estimates as it is possible if the development team’s goal is to achieve the best results.

Choosing a Mobile Application Development Platform

Try out a number of Mobile Application Development Platforms before you decide on purchasing a particular one. Rapid application development tools and platforms are a sizeable investment, and the ROI should, therefore, be taken into account. The best method of choosing a Mobile Application Development Platform is to try out a few shortlisted platforms before selecting the most suitable solution. A single Mobile Application Development Platform can be used to build more apps as per future requirement. HokuApps offers an enterprise mobile app platform with a prototype trial period. If you are looking to produce an industry-best custom enterprise mobile app, do go for HokuApps.