16 bit hex string to signed int in Java

java parsing signed hex
Dimme picture Dimme · Mar 4, 2013 · Viewed 11.8k times · Source

I have a string in Java representing a signed 16-bit value in HEX. This string can by anything from "0000" to "FFFF".

I use Integer.parseInt("FFFF",16) to convert it to an integer. However, this returns an unsigned value (65535).

I want it to return a signed value. In this particular example "FFFF" should return -1.

How can I achieve this? Since its a 16-bit value I thought of using Short.parseShort("FFFF",16) but that tells me that I am out of range. I guess parseShort() expects a negative sign.

Answer

Andreas Fester picture Andreas Fester · Mar 4, 2013

You can cast the int returned from Integer.parseInt() to a short:

short s = (short) Integer.parseInt("FFFF",16);
System.out.println(s);

Result:

-1

Related questions

Java negative int to hex and back fails

public class Main3 { public static void main(String[] args) { Integer min = Integer.MIN_VALUE; String minHex = Integer.toHexString(Integer.MIN_VALUE); System.out.println(min + " " + minHex); System.out.println(Integer.parseInt(minHex, 16)); } } Gives -2147483648 80000000 Exception in thread "main" java.lang.…

Read More
How to parse JSON in Java

I have the following JSON text. How can I parse it to get the values of pageName, pagePic, post_id, etc.? { "pageInfo": { "pageName": "abc", "pagePic": "http://example.com/content.jpg" }, "posts": [ { "post_id": "123456789012_123456789012", "actor_id": "1234567890", "picOfPersonWhoPosted": "http://example.com/photo.…

Read More
How to convert jsonString to JSONObject in Java

I have String variable called jsonString: {"phonetype":"N95","cat":"WP"} Now I want to convert it into JSON Object. I searched more on Google but didn't get any expected answers...

Read More