Converting Hexadecimal to Decimal in Java

Learn how to convert hexadecimal numbers to decimal in Java with clear explanations and code examples. Whether you're a beginner or an experienced Java developer, this guide will help you understand and implement the conversion process effectively.
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Hexadecimal and decimal are two commonly used number systems in programming. While decimal is base-10 (0 to 9), hexadecimal is base-16 (0 to 9 and A to F). Converting hexadecimal numbers to decimal is a fundamental task in programming, and Java provides built-in methods to facilitate this process.

Here's a step-by-step guide on how to convert hexadecimal to decimal in Java:

Understanding Hexadecimal and Decimal

In hexadecimal, each digit represents a power of 16, starting from the rightmost digit. For example, the hexadecimal number 1A can be expanded as (1 * 16^1) + (A * 16^0), where A represents the decimal value 10.

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In this example, hex is the hexadecimal string to be converted, and 16 specifies the radix (base) of the number system.

Custom Implementation

If you prefer a custom implementation without relying on built-in methods, you can iterate through each digit of the hexadecimal number and calculate its decimal equivalent.

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Handling Invalid Input

When converting hexadecimal to decimal, ensure that the input string contains valid hexadecimal characters (0-9 and A-F). Invalid characters may result in an exception or unexpected output.

Conclusion

By following the steps outlined in this guide, you can confidently perform hexadecimal to decimal conversions in your Java programs.