Java

The Kandio Method

Kandio’s assessment tests let you assess the candidates, employees, agencies or freelancers you have concerning any Java task you might have.

Remember that Kandio offers guidelines on which programmers to proceed with, and which ones to discard. Kandio will give you reliable directions about things programmers should know about, but a programmer can be excellent, even if he does not know about all of these things.

We suggest that you use our tests before your interview process to know which ones actually to talk to. The final Kandio report should be a piece of conversation with the strong candidates, rather than a disqualifying process in a late-stage interview process.

The test and how it’s structured

Our Java pre-assessment test contains 23 challenging questions. It’s built around common areas such as Object-Oriented Programming (OOP), Data Structures and Algorithms, and Garbage Collection among others.

This test will make you able to recognize the sharpest developers in your stack; hence all candidates would be required to pinpoint flaws and problems within existing code, as well as complete unfinished programs.

Which areas (chapters) will be covered in the test, and why was it chosen that way?

Object-Oriented Programming
Procedural programming is about writing procedures or methods that perform operations on the data, while object-oriented programming is about creating objects that contain both data and methods. Object-oriented programming has several advantages over procedural programming, which is also why we put a lot of focus on object-oriented programming in this test.

Java Basics
When we consider a Java program, it can be defined as a collection of objects that communicate via invoking each other's methods. There are many bits and pieces around the Java fundamentals, which is why we chose to include a more general chapter on this to the test.

Data Structures and Algorithms
A computer program is a collection of instructions to perform a specific task. For this, a computer program may need to store data, retrieve data, and perform computations on the data. A data structure is a named location that can be used to store and organize data. And, an algorithm is a collection of steps to solve a particular problem. Challenging candidates on topics around data structures and algorithms allow us to know if they are available to write efficient and optimized computer programs. Good computer programs can lack performance, and well-performing computer programs are not necessarily good. Having candidates demonstrate knowledge within data structures and algorithms is a critical component to any good Java developer.

Generics
It would be nice if we could write a single sort method that could sort the elements in an Integer array, a String array, or an array of any type that supports ordering. Java Generic methods and generic classes enable programmers to specify, with a single method declaration, a set of related methods, or with a single class declaration, a set of related types, respectively. Our tests include material on generics, to allow your candidates to demonstrate how good they are on this topic.

Threading
Challenging candidates on threading is important to set yourself apart when writing bigger programs with a lot of similar operations, as opposed to smaller and simpler programs with few operations at a time. Java is a multi-threaded programming language which means we can develop multi-threaded programs using Java. A multi-threaded program contains two or more parts that can run concurrently and each part can handle a different task at the same time making optimal use of the available resources especially when your computer has multiple CPUs. If your company handles large and complex programs with dozens of developers working on the same codebase, threading is essential to making efficient programs, and therefore deserves a place in this test.

Strings
Strings, which are widely used in Java programming, are a sequence of characters. In the Java programming language, strings are treated as objects. Strings are some of the very basics of Java, but since there are many levels of seniority and complexity of string concepts, we included a full section in this test around strings.