checklist.md

Common mistakes (jv-oop)

Please don't add redundant empty lines to your code.

We don't need them after class declaration or method signature.

• Bad example:

public class Main {

    public static void main(String[] args) {
    
        System.out.println("Hello world!");
    }
}

• Improved example:

public class Main {
    public static void main(String[] args) {
        System.out.println("Hello world!");
    }
}

Write informative messages in methods.

Use english only and make them informative: message should indicate what type of Machine is working right now Truck, Bulldozer or Excavator.

Use abstract reference instead of specific one where possible:

• Bad example:

Cat fluffy = new Cat();
Dog oscar = new Dog();

This example is bad cause it won't allow us to use polymorphism in our code. Our reference is now bonded to specific implementation, but it is always better to depend on the abstraction. Let's see how we can improve it:

• Improved example:

Animal fluffy = new Cat();
Animal oscar = new Dog();

Depending on the case, class elements should have different access modifiers

Remember that if you don't use any access modifiers that will apply the default one. Do we always want to have all elements with default access modifiers? Remind yourself about encapsulation principle and when private or public should be used.

Write informative messages when you commit code or open a PR.

Bad example of commit/PR message: done/fixed/commit/solution/added homework/my solution and other one-word, abstract or random messages.