FullStack Labs is a leading team of Java developers, engineers, programmers, coders, and architects. Uber, Siemens, and hundreds of other companies have chosen us for their mission-critical Java development projects.
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We really appreciate FullStack’s expertise, and understanding of best practices, for React.js. Their team really is working at the bleeding edge of the technology. After implementing their recommendations we’ve been able to increase automation and decrease labor by 50% in our AR department, freeing up our people for more productive uses.
It’s not easy to get 5 stars from me but you guys have been great! You show up on time, you finish within the schedule. We’re doing accounting and financial systems which means that you have to learn the business side of it. It’s not only software, you have to understand the workflow. Our experience has been amazing.
We will work with you to understand your technical need, team dynamics, and goals.
We’ll send you FullStack Java developers that match your technical requirements, with links to their FullStack profile page which outlines their work experience and technical abilities, as well as their FullStack technical summary page, which includes a 60 minute video of the developer completing FullStack’s coding challenge, and a plethora of other technical information from their interview with us.
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FullStack Labs is a leading team of Java developers, engineers, programmers, coders, and architects. Uber, Siemens, and hundreds of other companies have chosen us for their mission-critical software development projects. Java is a crucial tool to develop your project, here are a few Java Interview Questions you can use to screen your Java candidates:
Q: What is the difference between access modifiers and when would you use each?
Note: There are probably more details/examples they can go into in regards to access modifiers.
Q: Explain what/when an abstract class and interface would be used
Note: There are probably more details/examples they can go into in regards to abstract/implementation.
Q: How arguments are passed in Java?
If the original variable type is primitive (int,string, ...), then a copy of the variable is created inside the stack and then is passed to the method.
If the variable type is not primitive (Objects, ...), then a new pointer is created inside the stack which points to the actual object, and a new reference is passed to the method (Two references are pointing to the same object)
Q: What is the Java Reflection?
This is a feature that allows read and manipulate internal properties for our classes, objects, etc.
For example, it's possible for a Java class to obtain the names of all its methods and display them to the users automatically.
Q: How can you define Java Stream API?
Streams are wrappers around data where you can operate, execute different functions very similar to functional programming making bulk processing (calculation, transformation) to your data source.
Note: Do not confuse with Java I/O stream. A good comparison would be processing data like JS arrays with functions like (.map.filter.reduce, ...etc).
Q: What is the difference between a Set, a List, and a Map?
A Set is an interface that defines a collection that does not allow repetitions. The elements in a Set cannot be accessed by the index. Some implementations of Set are HashSet, LinkedHashSet, and TreeSet.
A List is an interface that defines a collection that guarantees the order of insertion, allows the elements to be gotten by their index, and may allow repetitions. Some implementations of List are ArrayList, Stack, and LinkedList.
A Map is an interface that defines a data structure that has a key and value relationship, elements inserted as keys cannot be repeated, and the value elements can be accessed by their keys. Values can be repeated. Some classes which implement Map are TreeMap, LinkedHashMap, and HashMap.
Q: What is a default method?
The default method was introduced in Java 8. It allows interfaces to have a default implementation of the methods they define. If the default method is not overridden by the class which implements the interface, the interface’s implementation will be used, as occurs using inheritance.
Q: What is an anonymous Class?
An anonymous Class is a local class implementation of an Interface. You can use it when you have a specific purpose for the implementation inside a method, like an event handling for example. The code below shows it:
The class Button has a method called setOnAction, which must receive an implementation of the Interface EventHandler as a parameter. This interface defines a method called
handle. To avoid creating another class that will have this implementation, it is possible to create a local implementation-specific for this action of this button called Submit. This code cannot be reused.
Note: Anonymous classes can be used for any Interface, it is not a specific feature for event handling.