Unicode to string conversion in Java

Question

I am building a language, a toy language. The syntax \\#0061 is supposed to convert the given Unicode to an character:

String temp = yytext().su         


        

Answer 1

You need to convert the particular codepoint to a char. You can do that with a little help of regex:

String string = "blah #0061 blah";

Matcher matcher = Pattern.compile("\\#((?i)[0-9a-f]{4})").matcher(string);
while (matcher.find()) {
    int codepoint = Integer.valueOf(matcher.group(1), 16);
    string = string.replaceAll(matcher.group(0), String.valueOf((char) codepoint));
}

System.out.println(string); // blah a blah

Edit as per the comments, if it is a single token, then just do:

String string = "0061";
char c = (char) Integer.parseInt(string, 16);
System.out.println(c); // a