Java Signed Hexadecimal

[Bully@Wiiplaza]

Hi,
I´m having issues with making my converter spit out "signed" hex results.

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decfield.setText(String.valueOf(Long.valueOf(hexfield.getText(), 16).longValue()));

What I get:

Hex (FFFFFFFF) -> Dec (4294967295)

What I wanted:

Hex (FFFFFFFF) -> Dec (-1)

Let me know what I have to modify in the code ^ above, please.

Thanks :smileyface:

[hawkeye2777]

First off, I'm guessing you want to use signed 32-bit correct? If so, you'll probably want to use int instead of long. As a result, you would use the Integer class and the parseInt(String s, int radix) method. However, according to this StackOverflow post, that method does not handle two's complement. Instead (using the answer from that page), you would want to use the BigInteger class. Your code would look something like this:

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int x = new BigInteger(hexfield.getText(), 16).intValue();
decfield.setText(x+"");


You can, of course, stick this in a one liner like in your original code snippet if you so choose. Hope this helps.

[Bully@Wiiplaza]

Works perfectly.