converting alphanumeric string to byte in java?

Question

Possible Duplicate:
Convert a hex string to a byte in Java

Here, I need to convert alphanumeric String to byte value ,for example:

String str ="1b" to byte value.I tried by using getbytes,(Byte.valueOf(str)), (Byte.parseByte(str)).

All the commands showed an exception called

  java.lang.NumberFormatException

help please

Are you expecting to get a value of 27, i.e. 0x1b? – Jon Skeet Dec 31 '12 at 09:08 — Jon Skeet, Dec 31 '12 at 09:08

score 3 · Answer 1 · answered Dec 31 '12 at 09:10

3

Assuming you're always going to have a 2-character string representing a hex value, you just want:

byte b = Byte.parseByte(text, 16);

You need to specify the 16 so that it knows to treat it as hex.

answered Dec 31 '12 at 09:10

Jon Skeet

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thank you .it works for me now.....!!!@ – user1939336 Dec 31 '12 at 09:19
what if it is a 3-character string? – user1939336 Dec 31 '12 at 09:35
@user1939336: Then it doesn't represent a single byte in hex, does it? – Jon Skeet Dec 31 '12 at 09:53
I need to convert alphanumeric string of 3-character to a byte ,then what i have to do for that? – user1939336 Dec 31 '12 at 09:57
1

@user1939336: It's impossible to answer that without knowing what value you'd want. What byte value should "XYZ" give? Once you've decided the behaviour you want, the implementation should be easy - but until you've decided that, it's impossible to help you. – Jon Skeet Dec 31 '12 at 12:36

score 2 · Answer 2 · answered Dec 31 '12 at 09:13

i hope this may help you

public class TestByte
{    
    public static void main(String[] argv) {

            String example = "example100";
            byte[] bytes = example.getBytes();

            System.out.println("Text : " + example);
            System.out.println("Text [Byte Format] : " + bytes);


    }
}

score 1 · Answer 3 · answered Dec 31 '12 at 09:11

1

using

Byte.parseByte("0x0b", 16); 16:radix

answered Dec 31 '12 at 09:11

Daniel

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converting alphanumeric string to byte in java?

3 Answers3