在 Java 中将字符串转换为字节

Question

Having:

byte temp;

and a String which represents a binary number:

String binary = "00100100";

I want to convert this binary number to hex and store it in byte, so: as 00100100 binary equals 24 hex, I want to obtain:

temp = 24;

or

temp = 0x24;

Answer 1

Here's an example

String binary = "00100100";
int value = Integer.parseInt(binary, 2);
System.out.println(value);
System.out.println("0x" + Integer.toHexString(value));

Integer.parserInt(String, int)

Parses the string argument as a signed integer in the radix specified by the second argument.

So it will convert the binary String value to an integer with the specified base.

You can then use the Integer.toHexString(int) method to convert that value to a hex representation, appending the 0x if you really want to.