Converting String to char when String is a valid char

Question

I am doing socket communication using bluetooth in which I am getting hex values as a variables in string format.

I can write -

char char1= 0x7D;

But somehow if value 0x7D is string then how to convert that to char.

For example, I can't do -

String string1 = "0x7D";
char char1 = (char)string1;

Any approach to do that ?

I want this because I can write to socket with -

char[] uploadCommand2 =  {0x7d, 0x4d, 0x01, 0x00, 0x01, 0xcb};

But can't if 0x7d is a string like --

char[] uploadCommand2 =  {string1, 0x4d, 0x01, 0x00, 0x01, 0xcb};

possible duplicate of How to convert/parse from String to char in java? — Pankaj Kumar
– Pankaj Kumar, Commented May 7, 2014 at 13:30
@UrsulRosu - that would return "0" for him. Not what he wants — dymmeh
– dymmeh, Commented May 7, 2014 at 13:31
not a duplicate, and I don't understand why this was downvoted. That's a good question, properly asked, with enough information to try and answer it. — njzk2
– njzk2, Commented May 7, 2014 at 13:31
@njzk2 Removed close vote. That was for the question before his edit... :) — Pankaj Kumar
– Pankaj Kumar, Commented May 7, 2014 at 13:35

Community · Accepted Answer · 2017-05-23 10:32:28Z

3

If you strip off the 0x prefix for your hex String representation, you can use Integer.parseInt and cast to char.

See edit below for an alternative (possibly more elegant solution).

String s = "0x7D";
//                  | casting to char
//                  |    | parsing integer ...
//                  |    |                | on stripped off String ...
//                  |    |                |               | with hex radix
System.out.println((char)Integer.parseInt(s.substring(2), 16));

Output

Edit

As njzk2 points out:

System.out.println((char)(int)Integer.decode(s));

... will work as well.

edited May 23, 2017 at 10:32

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answered May 7, 2014 at 13:32

Mena

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3 Comments

njzk2 Over a year ago

see stackoverflow.com/a/11377996/671543 no need to strip the 0x, decode does that

sjain Over a year ago

@Mena - Isn't it possible without stripping 0x ? Can't I get char 0x7D ?

Mena Over a year ago

@VedPrakash see my edit, after njzk2's suggestion. The decode method will do just that. However you'll need to double cast.

schubakah · Accepted Answer · 2014-05-07 13:32:53Z

0

Integer.parseInt(String) returns an Integer representation of the given String from which you can then obtain the character.

answered May 7, 2014 at 13:32

schubakah

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Comments

Gabriel Negut · Accepted Answer · 2014-05-07 13:33:46Z

0

String string1 = "0x7D";
char char1 = (char) Integer.parseInt(string1.substring(2), 16);

Edit: This works, but Integer.decode() is the way to go here (thanks to njzk2).

answered May 7, 2014 at 13:33

Gabriel Negut

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2 Comments

sjain Over a year ago

Isn't it possible without stripping 0x ? Can't I get char 0x7D ?

Gabriel Negut Over a year ago

@VedPrakash: No. The documentation states that the string can only contain +, - and digits of the specified radix (in this case, 0 - 9, a - f, A - F).

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