Question

I am converting a string into hexadecimal string and i want to convert that into octal string

I am doing it as follows

String s="I found the reason 2 days ago i was too bussy to update you.The problem was that the UDHL was missing. I should have added 06 at the beginning.  it all works fine.For some reason I thought kannel adds this by itself (not very difficult...), but now I know it doesn't...";


String hex = String.format("%040x", new BigInteger(1, s.getBytes("UTF-8")));

Output is

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

I need to convert hex to octal string. I tried like this

String octal = Integer.toOctalString(Integer.parseInt(hex,16));

But as expected it gave me number format exception as hex string have some characters in it.

I want to know how can i conver hex string to octal string.

Answer 1

As per the discussion in the comments, you want to convert each byte individually and convert them to octal:

String s     = "My string to convert";
byte[] bytes = s.getBytes("UTF-8");

for (byte b : bytes) {
    String octalValue = Integer.toString(b, 8);

    // Do whatever
}

Answer 2

The problem is, that your input (String hex) is to big to be stored in a single integer.

3 hex digits correspond to 4 octal digits. So split your input string in chunks of three digits, use the conversion you already figured out, and concatenate the outputs.

How to convert hex string to octal string in java

2 个答案: