Necessity of using 0XFF in java. lang. Integer. toHexString (B [n] & 0XFF)

Byte [] B = {1, 2, 20,108 };

String stmp = java. Lang. Integer. tohexstring (B [N] & 0xff)

 

In 32-bit computers, numbers are stored in 32 format. If a byte (8-bit) number is used, its 24-bit height is a random number, which is 8-bit lower.

Is the actual data. The parameter of Java. Lang. Integer. tohexstring () method is of the INT (32-bit) type. If you enter a byte (8-bit) type number

The method regards the value 24 as a valid bit, which will inevitably lead to errors. Using the & 0xff operation, you can set the value 24 to 0 to avoid such errors.

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