在JavaCard中将字节转换为short

Question

In java card only small data types are used (byte and short). I am trying to convert byte to short such that i can use it for checking condition,etc. When byte is converted into short using type cast in java card it gives me some other negative number. Please tell me how to convert (11111111) that is ff store in single byte to short.

I am using:

1. smart card type = contact card
2. using java card 2.2.2
3. with jcop using apdu

Answer 1

您可以使用javacard.framework.Util.makeShort（字节b1，字节b2）方法。

Answer 2

Isn't the Java Card language simply the same as Java? Then you can write

shortvar = bytevar&0xFF;

Answer 3

我知道你已经回答了，但据我所知，好的方法是使用javacard.framework.Util makeShort方法，当你给2个字节时它会返回短路。