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J# is a discontinued computer programming language developed by Microsoft Corporation, designed to provide a bridge for Java-language developers into the .NET environment. Introduced in 2002, it was part of the Visual J++ development tool and was functionally similar to Java with additional .NET framework support. It enabled developers to use Java syntax and libraries in developing .NET applications. However, Microsoft stopped its support for J# in 2007 due to its declining usage and popularity among developers. The information about J# can be found on Microsoft's official website and several trusted tech publications.

Ask the right questions secure the right J# talent among an increasingly shrinking pool of talent.

First 20 minutes

General J# app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in J# application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

How would you declare a variable in J#?

You can declare a variable in J# by specifying the data type followed by the variable name. For example, 'int myVariable;' declares an integer variable named myVariable.

What are the primitive data types in J#?

The primitive data types in J# include byte, short, int, long, float, double, boolean, and char.

How would you handle exceptions in J#?

In J#, exceptions are handled using try-catch blocks. The try block contains the code that might throw an exception, and the catch block contains the code to handle the exception.

What is the difference between a class and an object in J#?

A class is a blueprint or template that describes the behavior/state that the objects of the class will have. An object is an instance of a class.

How would you implement inheritance in J#?

Inheritance in J# is implemented using the 'extends' keyword. The child class uses the 'extends' keyword to inherit the properties and methods of the parent class.

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What you’re looking for early on

Has the candidate demonstrated a strong understanding of J# and its applications?

Does the candidate have experience with similar projects or tasks?

Is the candidate able to effectively communicate their thoughts and ideas?

Does the candidate show problem-solving skills?

Next 20 minutes

Specific J# development questions

The next 20 minutes of the interview should focus on the candidate's expertise with specific backend frameworks, their understanding of RESTful APIs, and their experience in handling data storage and retrieval efficiently.

What are the access modifiers in J#?

The access modifiers in J# include public, private, protected, and default. They determine the scope of a method, variable, or class.

Describe the difference between overloading and overriding in J#.

Overloading is when two or more methods in the same class have the same name but different parameters. Overriding is when a child class has a method with the same name and parameters as a method in its parent class.

How would you create a thread in J#?

You can create a thread in J# by creating a new instance of the Thread class and passing the name of the method to be executed in the thread as a parameter to the Thread constructor.

What are the different types of loops in J#?

The different types of loops in J# include for loop, while loop, and do-while loop.

Describe the difference between an interface and an abstract class in J#.

An interface is a reference type in J# that is similar to a class and is used to define a contract for classes to implement. An abstract class is a class that cannot be instantiated and is used to define a common base class for its derivatives.

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At this point, a skilled J# engineer should demonstrate strong problem-solving abilities, proficiency in J# programming language, and knowledge of software development methodologies. Red flags include lack of hands-on experience, inability to articulate complex concepts, or unfamiliarity with standard coding practices.

Digging deeper

Code questions

These will help you see the candidate's real-world development capabilities with J#.

What does this simple J# code do?
public class HelloWorld {
 public static void main(String[] args) {
 System.out.println('Hello, World!');
 }
}
This code prints 'Hello, World!' to the console.
What does this J# code do?
public class Test {
 public static void main(String[] args) {
 int x = 10;
 int y = 20;
 System.out.println(x + y);
 }
}
This code prints the sum of two integers, 10 and 20, to the console.
What will be the output of this J# code?
public class ArrayTest {
 public static void main(String[] args) {
 int[] arr = {1, 2, 3, 4, 5};
 for(int i: arr) {
 System.out.println(i);
 }
 }
}
This code prints each element of the array to the console, one element per line.
What does this J# code do?
public class ThreadTest extends Thread {
 public void run() {
 System.out.println('Thread is running.');
 }
 public static void main(String args[]) {
 ThreadTest t1 = new ThreadTest();
 t1.start();
 }
}
This code creates a new thread and starts it. The new thread prints 'Thread is running.' to the console.

Wrap-up questions

Final candidate for J# Developer role questions

The final few questions should evaluate the candidate's teamwork, communication, and problem-solving skills. Additionally, assess their knowledge of microservices architecture, serverless computing, and how they handle J# application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

How would you implement polymorphism in J#?

Polymorphism in J# can be implemented in two ways: method overloading and method overriding. Method overloading is compile-time polymorphism, and method overriding is runtime polymorphism.

What are the different types of collections in J#?

The different types of collections in J# include List, Set, Map, Queue, and Stack.

Describe the difference between a checked and an unchecked exception in J#.

A checked exception is an exception that is checked at compile time. An unchecked exception is an exception that is checked at runtime.

J# application related

Product Perfect's J# development capabilities

Beyond hiring for your J# engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in J# projects, and can engage in multiple capacities.

J# Consultive assessments

J# Application Conversion Assessment J# Application Integration Assessment J# Data & Database Integration Assessment

Custom J# development projects

Custom J# App Conversion J# Custom App Development Process App UI Design for J# Facelifts

Hiring guide for J# Engineers

J# Developer Hiring Guide

What you’re looking for early on

The ideal back-end app developer

What you’re looking to see on the J# engineer at this point.

J# Consultive assessments

Custom J# development projects