A doozie of a String - int casting question (java)

Q_Ball

hey guys,

I'm parsing a text file for a hexidecimal value in java. unfortunately the only way i can get the hex value is in String format. and because its in hex the parseInt method wont work cos its an invalid number format (basically the x fecks things up. i cant take it in as a TT_NUMBER because of the x, and Streamtokenizer takes everything after the x as a TT_WORD. so i get an nval 0 and a sval x01 instead of 0x01.). Does anyone know how to extract it as an integer or how i can convert it to an int? been looking at regex but i havent found out how it will help.

all the best,

Darren

s4dd

i believe the getInteger() method in class Integer would sort ye. recognises the "0x" and prases the value after as a hex. hence why i'd suggest this over the valurOf() method.


regards

phil

If you're using parseInt(String str, int radix), then yes you're going to have trouble with the 0x at the start of the String. But remember, you're using Strings! Simply remove it by using the substring() method!

This would have been the workaround you needed.
Note: It's probably best to test that it exists at the start of the string, before blindly removing the first two characters.

However, there is a purpose built function you can use, see Integer.decode().

int dec_value = 0;
String str = "0xA";

try {
        dec_value = Integer.decode(str).intValue();
}
catch (NumberFormatException e)
{
        e.printStackTrace();
}

System.out.println("Integer value = " + dec_value);