Java negative int to hex and back fails

Question

public class Main3 {
    public static void main(String[] args) {
        Integer min = Integer.MIN_VALUE;
        String minHex = Integer.toHexString(Integer.MIN_VA         


        

Answer 1

According the the documentation, toHexString returns "a string representation of the integer argument as an unsigned integer in base 16. "

So the correct reverse operation is probably Integer.parseUnsignedInt that was introduced as part of Java 8:

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.parseUnsignedInt(minHex, 16));
    }