12.1. Calling a C Function from a Java Program
Suppose you have a C function that does something you like and, for one reason or another, you don’t want to bother reimplementing it in Java. For the sake of illustration, we’ll start with a simple C function that prints a greeting.
The Java programming language uses the keyword
native for a native method, and you will obviously need to place a method in a class. The result is shown in Listing 12.1.
native keyword alerts the compiler that the method will be defined externally. Of course, native methods will contain no code in the Java programming language, and the method header is followed immediately by a terminating semicolon. Therefore, native method declarations look similar to abstract ...