字符串等效

Question

String s="00110001" is a string containing the hexadecimal number 31 . What I want to know is how can I convert it to a string String a="1" . (since the ASCII code for 1 is 49 and 49 in hexa is 31 .)

Answer 1

Try this:

String hex = "";
for(int i=0; i<=s.length() - 4; i+=4) {
    hex += Integer.parseInt(s.substring(i, i+4), 2) + "";
}
System.out.println((char)Integer.parseInt(hex, 16));

Answer 2

You convert the number to decimal using the Integer.parseInt(string, radix) first.

int dec = Integer.parseInt(s, 2); //This will give you the value 49
System.out.println((char)dec);

Also, correction in your question: 00110001 is 31 in decimal