Learning code conventions while learning programing [closed]

Trying to create a project is a pretty good way to learn! A few things:

Class names should start with upper case letters, like String, variable and method names should use the camel case naming convention: myVariable, myMethod. An exception is when a variable is constant, full upper case name in that case:

 final in MY_CONSTANT = 3;

Always give clear names for your variables and methods, so it's possible to know what they do just by reading the name.

Comment your code! This is very important, as good, informative comments will help you and others understand the code. You can also take a look at (Javadoc comments).[https://www.tutorialspoint.com/java/java_documentation.htm]

You already mentioned object oriented programming, so don't be afraid to make classes for the entities in your project, like Customer or Device. You can combine the classes to better model your Computer Repair Shop:

public class Customer {

 private String name;
 private List<Device> devices; //all devices of the customer 

 public Customer(String name) {
      this.name = name;
      devices = new ArrayList<>();
 }

 public void registerDevice(Device d) {
      devices.add(d); 
 }

}

This is just a stupid little example of course, but you get the point.