为什么以下代码将字节打印为整数？

Question

Shouldn't address.getAddress())[2]) be printing in 0-1 or byte format because it itself is a byte. Why is it printing -126?

public static void main(String s[]) {
    try {
        String arg="www.google.com";
        InetAddress address = InetAddress.getByName(arg);
        System.out.println("Address: " + (address.getAddress())[2]));
    } catch (UnknownHostException exc) {
        System.out.println(exc);
    }
}

Answer 1

In Java, a byte is an 8-bit signed integer. This means that it can take values from decimal -128 to decimal +127.

When you say byte format , you might mean an unsigned value from 0 to 255. If you want to use a byte b as an unsigned value, you should use b & 0xff .

If what you're trying to do is print the byte as a two-character hex string, you should use

String.format("%02X", b)

Answer 2

Java中的字节值从-128到127。-126是有效字节值。