Скачать или смотреть How to Properly Reference the calculateTotal Method in Another Class in Java

A comprehensive guide on how to reference the `calculateTotal` method from the `ShoppingList` class in another Java class effectively, featuring two practical solutions.
---
This video is based on the question https://stackoverflow.com/q/69962913/ asked by the user 'teheheugh' ( https://stackoverflow.com/u/14421731/ ) and on the answer https://stackoverflow.com/a/69963051/ provided by the user 'Luisa Sanchez' ( https://stackoverflow.com/u/6245929/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Need to implement in another class

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Properly Reference the calculateTotal Method in Another Class in Java

In the world of programming, it's common to face challenges when trying to use methods defined in one class within another. One such scenario arises when you have a method that calculates the total of a shopping list and you need to use this method in a different class. This guide will guide you through the process of referencing the calculateTotal method from the ShoppingList class in another class in Java.

The Problem

Consider the following ShoppingList class, which includes a method calculateTotal that computes the total price of items:

[[See Video to Reveal this Text or Code Snippet]]

Now, suppose you want to check if the total is greater than 25 in another class. You might start with something like this:

[[See Video to Reveal this Text or Code Snippet]]

However, this code will not work as you cannot directly reference the calculateTotal method without properly creating an instance of the class or modifying the method to be static.

Solutions to Reference calculateTotal

You have two effective options to achieve this goal.

1. Instantiate the ShoppingList Class

The first option is to create an instance of the ShoppingList class and then call the calculateTotal method using this instance. Here’s how you can do it:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown:

Instantiate the Class: ShoppingList myShoppingList = new ShoppingList(); creates an object of the ShoppingList class.

Call the Method: You can then call myShoppingList.calculateTotal() to get the total price of the items.

2. Make the calculateTotal Method Static

Alternatively, you can modify the calculateTotal method to be static. This allows you to call the method without needing an instance of the class. Here’s how it's done:

[[See Video to Reveal this Text or Code Snippet]]

Then, you can use it like this:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown:

Static Method: Changing the method to static allows it to be called on the class itself (ShoppingList.calculateTotal()), rather than on an instance of the class.

Direct Access: This is useful if the calculation does not rely on instance-specific data and can be performed based on static data or parameters.

Conclusion

Both methods outlined above provide valid solutions for referencing the calculateTotal method from the ShoppingList class in another class. Whether you choose to instantiate the class or make the method static depends on your specific use case and design preferences in your Java application.

By following this guide, you can confidently reference methods across classes in Java, helping you to build cleaner and more efficient code. Happy coding!