Numeric Parameters and Return Values
When passing numbers between C and the Java programming language, you should understand which types correspond to each other. For example, although C does have data types called int and long, their implementation is platform dependent. On some platforms, ints are 16-bit quantities, and on others they are 32-bit quantities. In the Java platform, of course, an int is always a 32-bit integer. For that reason, the Java Native Interface defines types jint, jlong, and so on.
Table 11-1 shows the correspondence between Java types and C types.
|Java Programming Language||C Programming Language||Bytes|