String to byte[] and byte[] to String [duplicate]

Question

I'm dealing with some code that converts a String into a byte[], then from byte[] to String (a String which is a binary representation of the original String), then I'm supposing to do something with that String.
When I try to convert the String to byte[] and byte[] to the original String, something is not working.

        byte[] binary = "Example".getBytes(StandardCharsets.UTF_8);
        String x = new String();
        for(byte b : binary)
        {
                x += Integer.toBinaryString(b);
        }
        byte[] b = new byte[x.length()];
        for (int i = 0; i < b.length; i++) 
        {
            b[i] = (byte) (x.charAt(i) - '0');
        }
        String str = new String(b, StandardCharsets.UTF_8);
        System.out.println(str);

As you can see in that code, I'm using an example String called "Example" and I'm trying to do what I wrote above.
When I print str, I'm not getting that "Example" string.
Does anyone know a way to do this? I searched for a solution on Stack Overflow itself, but I can't figure out a solution.

have you tried Arrays.toString(byte[] ) for converting byte to string? — Shriram
– Shriram, Commented Dec 22, 2015 at 15:36
x += Integer.toBinaryString(b); would be x += "1000101"; for character 'E' (=ascii 69) — Jörn Buitink
– Jörn Buitink, Commented Dec 22, 2015 at 15:47
@JörnBuitink yes, but how I reconvert that binary string into the original string "Example"? — Omar93
– Omar93, Commented Dec 22, 2015 at 16:28
That's the crucial point: I have a binary string (example "100101" for character "E", as you said) and I have to display back "E" using that binary string — Omar93
– Omar93, Commented Dec 22, 2015 at 16:32

dolan · Accepted Answer · 2015-12-22 15:40:29Z

-1

This should work without the middle section.

byte[] binary = "Example".getBytes(StandardCharsets.UTF_8);
String str = new String(binary, StandardCharsets.UTF_8);
System.out.println(str);

answered Dec 22, 2015 at 15:40

dolan

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6 Comments

Omar93 Over a year ago

Nope. I said I'm supposing to do something with that byte[] array so I can't delete that middle section.

dolan Over a year ago

Well then the real question is what are you trying to do with it? Because that mutation operation is what's causing the string to change.

Omar93 Over a year ago

I'm implementing something like a cipher, so I have to do something with the binary representation of the string and then obtain again the binary representation of the string so I can obtain the original string.

dolan Over a year ago

Oh. Now I get it. You are converting a string -> byte[] -> string of 1s and 0s -> byte[] where each element is a bit of the 1s and 0s string -> string. You will need to use bit shifting to get that second byte[] to be bytes instead of just bits if you want to convert it back to a string.

Omar93 Over a year ago

Could you post some code example? I would be very grateful!

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