CODEWITHSUNDEEP
javaparsingformatter
Shaddox27
Shaddox27

Reputation: 29

Using Java StringBuilder Formatter class

I'm learning how to use java's Formatter class. I'd like to convert a positive byte to a hexadecimal number, then parse it into a String with two digits.

My method would look something like this:

String toHexString(byte byteToConvert) {
        StringBuilder hexBuilder = new StringBuilder();
        hexBuilder.append(Integer.toHexString(byteToConvert));
        return hexBuilder.toString();
}

Is there a way to be able to format the String (or the StringBuilder) to get two digits?

System.out.println(toHexString(127)); // Would like it to output "7f"
System.out.println(toHexString(1)); // Would like it to output "01"

Upvotes: 1

Views: 540

Answers (1)

Mureinik
Mureinik

Reputation: 311528

You don't need a StringBuilder here. Simply using String.format would do the trick:

String toHexString(byte byteToConvert) {
    return String.format("%02x", byteToConvert);
}

Upvotes: 2

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