![]() The base class for this is ATMTransaction. Now we need to model the transactions that can take place when the customer uses the ATM. Its method enables it to access the ATM and therefore the account. The DebitCard class has a card number and is also owned by a customer. It has a method to enable it to check the account balance. An account is owned by a customer and also has a type, such as savings or checking. The only method for the customer is to own an account and to own a debit card. You can explore the full syntax for the diagram in the example at the end. Now that you’re familiar with the Gleek syntax, let’s just create each class. The relationship between the bank and the customer is that the bank has customers. Gleek will suggest autocompleted syntax when you start typing, so that’s a great way to learn what works.Įvery bank needs customers, so we’ll create the Customer class. Don’t be afraid to experiment if you want to try out all the different possible cardinality options. You can read more about cardinality in our detailed class diagram page. The label “maintains” explains the relationship between the bank and the ATM, while the number one in curly brackets tells us about the cardinality of the relationship. Just type the following line after your classes. We should add a line between the bank and ATM classes to show how they work together. Its methods are related to transactions, which it identifies and carries out. The ATM is managed by the bank and it has a location. Next, we need to create an ATM at the bank. You can read more about this in our detailed look at UML class diagrams. The plus symbols just indicate that these attributes and methods are public. The following simple lines of Gleek syntax is all you need to create a class for your class diagram. You tell Gleek that something is a method by adding parentheses after it. In Gleek, you create a class by just typing the name of the class, hitting enter and then the tab key, and then adding your attributes and methods. The methods that the bank class can use to interact with its ATM are manage and maintain. ![]() The bank needs a code to identify it and an address. In the real world, each of these classes might have a lot more attributes and methods, but we’ll keep things simple and only model what we need. First, we need to work out what classes we need. We’ll use a bank ATM system so that we can model a few different interactions between classes. Let’s create an example of a class diagram. Modeling an ATM system with a class diagram ![]() The top part of the rectangle contains the name, the middle part contains attributes, and the bottom part contains methods. Methods are also known as operations.Ī class is represented in a class diagram as a rectangle with three different sections. Methods are the ways in which the class interacts with other classes and explain the types of communication or messages that will need to be created. Īttributes are the characteristics of the class and represent data elements that will need to be stored for the class. Make your own UML class diagram with Gleek. In a class diagram, each class acts as a template, or blueprint, for a type of object that can exist in the system. Class diagrams are great for sketching a static overview of a system so that all stakeholders can make sure that their requirements will be met. For over 20 years, the UML standard has provided software engineers with a standardized way to visualize and diagram systems before starting to code. What is a class diagram and what is it used for?Ĭlass diagrams are one of the most popular Unified Modeling Language diagrams. ![]()
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