Скачать или смотреть How to Extract the Number from a Command String in Java Dungeon Crawlers

Learn how to easily retrieve the number value from command strings in your `Java` dungeon crawler with simple string manipulation techniques.
---
This video is based on the question https://stackoverflow.com/q/71602222/ asked by the user 'SkyeBoniwell' ( https://stackoverflow.com/u/880874/ ) and on the answer https://stackoverflow.com/a/71602379/ provided by the user 'pandaman' ( https://stackoverflow.com/u/17978414/ ) 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: How can I get the value at the end of a string?

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 Extract the Number from a Command String in Java Dungeon Crawlers

Creating a text-based dungeon crawler in Java can be a fun and rewarding project. One common task that programmers face in these types of games is the need to parse user input commands. For instance, players often enter commands that consist of a direction or action followed by a number, such as "NTH 21" or "ATT 3". If you're new to string manipulation in Java and are unsure how to effectively extract the numeric values from these commands, you're in the right place!

In this guide, we'll walk through how to retrieve the number from a command string step-by-step. Let’s dive in!

The Problem

You're writing a simple text-based dungeon crawler game where users input commands along with numeric values. For example:

Move Command: NTH 21

Attack Command: ATT 3

Cast Spell Command: CST 102

You’ve made progress by using the substring() method to obtain the action part of the command, but you're unsure how to handle the varying lengths of the number that comes after the command.

The Solution

To successfully extract the number from the command string, we can use the built-in String# split() method. This method allows us to break the input string into an array of components based on specified delimiters—in our case, a space character. Here’s how to implement this solution:

Step 1: Split the Command

The first step involves splitting the user input string. Here is how you can do it:

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

This line takes the entire user command and splits it into an array of strings wherever there is a space.

Step 2: Retrieve the Last Argument

After splitting the input, the last element of the resulting array (args) will be the numeric value you want. You can extract it using the following code:

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

The args.length - 1 index targets the last item in the array, which corresponds to the number associated with the command.

Putting It All Together

Here’s how the complete code might look in the context of your game’s input handling:

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

Final Thoughts

String manipulation is a fundamental aspect of programming in Java, particularly for text-based games like your dungeon crawler. Using the split() method provides a tidy and efficient way to access individual components of user input.

Now that you understand how to extract numbers from command strings, you can further enhance your game by adding additional features or refining the commands your players can use.

Happy coding, and may your dungeon crawler thrive!