How to Convert a String to its Hexadecimal Representation and Back in Java?

Java Hexadecimal String Conversion

Q: How can I transform a string, such as "testing123," into its hexadecimal representation in Java? Is the conversion back a similar reversal of the process?

A:

Conversion to Hexadecimal:

Utilize the following code snippet to convert a string to hexadecimal:

public String toHex(String arg) {
    return String.format("%040x", new BigInteger(1, arg.getBytes(/*YOUR_CHARSET?*/)));
}

Note: The optional parameter YOUR_CHARSET allows you to specify the charset used to encode the string.

Conversion Back to String:

The conversion back to a string from hexadecimal is more involved. Here's a breakdown of the steps:

1. Parse the hexadecimal string into a BigInteger.
2. Convert the BigInteger to a byte array using its toByteArray() method.
3. Construct a String using the byte array and the desired charset via the constructor String(byte[], Charset).

Use the same arg.getBytes() approach from the conversion to hexadecimal, ensuring consistent charset handling.

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