Unleash the Power of Java: A JavaScript Developer's Guide to Best Practices in Java Development

Feb 5, 2023·

5 min read

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As a JavaScript developer diving into the world of Java, I've observed several keys differences in best practices and conventions. In this post, I'll share my insights on object-oriented programming, code style and formatting, and exception handling in Java.

Object-Oriented Programming

Java is an object-oriented language, where entities and their properties are represented as objects. It also follows the SOLID principles, a set of five guidelines for creating maintainable and scalable software. In contrast, JavaScript is a prototype-based language that uses objects as blueprints for creating new objects.

public class Dog {
    private String name;
    private int age;

    public Dog(String name, int age) {
        this.name = name;
        this.age = age;

    public String getName() {
        return name;

    public int getAge() {
        return age;
class Dog {
    constructor(name, age) {
        this.name = name;
        this.age = age;

    getName() {
        return this.name;

    getAge() {
        return this.age;

A few key differences between Java and JavaScript include:

  1. Class Declaration: Java classes are declared with the class keyword, while JavaScript classes use the class keyword from ECMAScript 2015 (ES6).

  2. Constructors: Java constructors are declared with the public keyword, followed by the class name and constructor arguments. In JavaScript, constructors are declared with the constructor keyword and constructor arguments.

  3. Access Modifiers: Java has access modifiers, such as private, to control the visibility of class members. JavaScript doesn't have access modifiers, but the _ (underscore) prefix is often used to indicate private properties.

  4. Methods: Both Java and JavaScript use the function keyword to declare methods. In Java, methods are declared inside the class, while in JavaScript, methods are declared inside the class using the methodName() syntax.

It's essential for a JavaScript developer transitioning to Java to understand these differences in class declaration, constructors, access modifiers, and method declaration.

Code Style and Formatting

The Java Community Process defines a well-established coding standard for Java, which includes format, naming conventions, and other coding principles. Adhering to this standard ensures readable, manageable, and consistent code. Java also requires Javadoc comments, concise documentation for classes, methods, and variable definitions.

In comparison, JavaScript doesn't have a strict coding standard, although it does have widely accepted code style guides like the Airbnb JavaScript Style Guide and the JavaScript Standard Style. These guides provide recommendations for code formatting and naming conventions, but they are not as strictly enforced as the Java coding standard.

By following a strict coding standard and focusing on code readability and maintainability, Java development prioritizes high-quality, well-organized code. This is especially important for large projects where code maintenance and updates are crucial.

Exception Handling

Java has a robust exception handling mechanism to handle errors and exceptions in a program. In contrast, JavaScript relies on try-catch blocks or custom error objects to handle errors, which can become complex in larger projects with multiple errors. Java provides a range of built-in exceptions and encourages developers to catch and handle exceptions as early as possible.

Here's an example of Java's built-in exceptions:

public class ExceptionExample {
  public static void main(String[] args) {
    try {
      int result = divide(10, 0);
    } catch (ArithmeticException e) {
      System.out.println("Cannot divide by zero!");

  private static int divide(int a, int b) {
    return a / b;

In this example, the divide method checks if the denominator `b` is equal to zero, and if so, it throws an ArithmeticException when the divisor b is zero. The exception is then caught in the main method using a try-catch block. The catch block handles the exception by printing a user-friendly error message, that includes the exception message that was thrown in the divide method.

And here's an example of error handling in JavaScript:

function divide(a, b) {
  if (b === 0) {
    throw new Error("Cannot divide by zero!");
  return a / b;

try {
  let result = divide(10, 0);
} catch (error) {

In this example, the divide() function will throw a custom error when the divisor b is zero. The try-catch block will catch this error and print the error message.

I hope these examples give you a better understanding of the differences between Java and JavaScript's exception handling mechanisms.

Learning Resources

Learning a new programming language can be an exciting, but challenging experience. Here are a few resources that can help you on your journey to learning Java:

  1. Official Java Documentation: The official Java documentation is a comprehensive resource that covers all aspects of the language, from the basics to advanced topics. It's a great place to start for anyone new to Java.

  2. Online Courses: Online platforms such as Udemy, Coursera, and edX offer a wide range of Java courses, both paid and free, that can help you get up to speed quickly.

  3. Books: There are many excellent books available on Java, ranging from beginner-friendly introductions to more advanced topics. Some popular options include "Head First Java" and "Effective Java", Which can be found on Amazon.

  4. Java Community: The Java community is large and vibrant, with many forums and resources available to help you learn and troubleshoot. Consider joining online communities, such as Stack Overflow, for additional support.

These resources can help you get started on your journey to learning Java, but the most important thing is to keep practicing and building your skills. Good luck!


To summarize, Java and JavaScript are both influential and commonly utilized programming languages, yet they possess significant distinctions in terms of programming methods, code style and formatting, exception handling and type systems. Java boasts a strong and standardized development environment that prioritizes code comprehensibility, upkeep and stability, while JavaScript affords a more adaptable and dynamic ecosystem that enables more imaginative and pioneering development. As a JavaScript developer moving to Java, it is crucial to comprehend these differences and familiarize oneself with the standard practices and conventions applied in Java development.

In conclusion, embrace the learning process of transitioning from JavaScript to Java and experience the benefits of Java's robust and standardized development environment. Start your journey today!"