Convert hex code in string to hex code in byte (java)

Question

I have a hex code in string example

String a="0x52";

I want to store this hex value in a byte example

byte b=(do something with a so i can store it in b);

so byte b is going to store 0x52

How to achieve this ?

Just for reference my teacher gave this sample code

public  byte[] CONSIGNMENT_0 = { 0x52, 0x44, 0x54, 0x30, 0x31, 0x9, 0x6f, 0x6e,  
                                           0x65, 0xa, 0x32, 0x9, 0x74, 0x77, 0xa, 0xd };

And its working perfectly so we can store 0x52 in a byte variable.

I tried that its not working its giving a run time error NumberFormatException: for input string "0x52" even Byte.parseByte is not working — bisho
– bisho, Commented May 13, 2017 at 15:58

Elliott Frisch · Accepted Answer · 2017-05-13 15:57:39Z

1

You are writing a hex constant, so you can parse it with Integer.parseInt(String, int) (the second argument is a base) and then cast it to a byte. Like,

String a = "0x52";
byte b1 = 0x52;
byte b2 = (byte) Integer.parseInt(a.substring(2), 16);
System.out.println(b1 == b2);

Outputs

true

answered May 13, 2017 at 15:57

Elliott Frisch

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