How to Convert string to HexaDecimal?

Question

I have a string like this:

"12"

And I need to convert it to a hex value like this:

0x12

I have a byte array like this

// 00 20 22 80 08 24 pi nn ff ff ff ff ff 
byte VerifyingAPDU[] = { (byte)0x00,(byte)0x20,(byte)0x00,(byte)0x80,(byte)0x08,(byte)0x24,
                     (byte)0x12,(byte)0x34, //pi nn
                     (byte)0xff, (byte)0xff, (byte)0xff, (byte)0xff, (byte)0xff };
Now i want to replace pi nn with user entered value in Eidter (EditText). how to do this ?

For example user entered 1111 in editer i have to replace Ox12 --> 0x11 and 0x34-->0x11.

This question is answered here: http://stackoverflow.com/questions/923863/converting-a-string-to-hexadecimal-in-java — Jose Antonio Benitez Montero, Jun 03 '13 at 07:31

score 11 · Accepted Answer · edited Feb 24 '20 at 10:57

11

This should be

Integer.toHexString(Integer.parseInt(String));

Ref : Convert to/from hexadecimal

edited Feb 24 '20 at 10:57

Jignesh Mayani

6,937
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answered Jun 03 '13 at 07:31

Pankaj Kumar

81,967
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I tried like that.. see if i have String a = "12"; i want to get create hex value for that is `0x12`. how to do this. – RajaReddy PolamReddy Jun 03 '13 at 07:37
@RajaReddyPolamReddy, er, `"0x" + Integer.toHexString(Integer.parseInt(String));` – Simon Jun 03 '13 at 07:39
I agreed with @Simon. You can do like that. Is there any problem – Pankaj Kumar Jun 03 '13 at 07:40
@PankajKumar i will check like this, let u know the result. – RajaReddy PolamReddy Jun 03 '13 at 08:20
Its giving me the HexaDecimal Value upto that it's ok. for my requirement i want to do like this. look at the edited Question. – RajaReddy PolamReddy Jun 03 '13 at 08:42
@RajaReddyPolamReddy ahhhh your updated question is completely different from asked.. And you unaccepted the answer... :) – Pankaj Kumar Jun 03 '13 at 08:53
Sry for that. Please can u tell me the solution for this. i am struck at that.please... – RajaReddy PolamReddy Jun 03 '13 at 09:01
For converting String to Hex this code working well.. – RajaReddy PolamReddy Jun 03 '13 at 09:04
`int inputInteger = Integer.valueOf(edit_text_value); String firstHex = "0x" + Integer.toHexString(inputInteger/ 100); String secondHex = "0x" + Integer.toHexString(inputInteger % 100);` Use these codes.. here I assumed that length of edittext is set to 4. – Pankaj Kumar Jun 03 '13 at 09:05
Actually, if i enter 1234 was the pin i have to get 0x12 and 0x34, but this code gives me like this 0xc and 0x22.. – RajaReddy PolamReddy Jun 03 '13 at 09:28
yes I am right till you are asking about HEX. But again you are saying another thing if 12 should be 0X12 then this is not a HEX of 12. You can simply add '0X' to given string.. – Pankaj Kumar Jun 03 '13 at 09:34
@PankajKumar i tried to convert String to byte, i am unable to convert it. can u help me on this typecast..please. – RajaReddy PolamReddy Jun 03 '13 at 11:32

How to Convert string to HexaDecimal?

1 Answers1