How can I generate a hexadecimal code from another sequence of numbers?

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I’m making a code generator app, I need to generate a hexadecimal code from the code typed by the user and show this generated hexadecimal code. Could someone explain to me how I can get to this? I’m a beginner in this area.

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    In what language? In languages that understand printf() masks, you could do something like printf("%x", number);

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    At first the solution of this question (http://stackoverflow.com/questions/923863/converting-a-string-to-hexadecimal-in-java) works, has tried already?

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If you have a string with any number, for example:

String str = "43956";

You must first convert this to an integer number, so:

int num = Integer.valueOf(str).intValue();

Then you can convert that number to a string of hexadecimal digits, like this:

String hex = Integer.toHexString(num);

Now it’s a matter of organizing your UI to display that value.

The documentations:

Integer.valueOf(String s) Integer.intValue() Integer.toHexString(int i)

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