Java JNI call to load library

Question

Does it impact memory if I have two Java classes that have native calls to compiled C code and I call both those classes in another class? For instance I have Class A and Class B with both calls to native functions. They are setup like this:

public class A{
    // declare the native code function - must match ndkfoo.c
    static {
        System.loadLibrary("ndkfoo");
    }

    private static native double mathMethod();

    public A() {}

    public double getMath() {
          double dResult = 0;  
          dResult = mathMethod();
          return dResult;
    }
}


public class B{
    // declare the native code function - must match ndkfoo.c
    static {
        System.loadLibrary("ndkfoo");
    }

    private static native double nonMathMethod();

    public B() {}

    public double getNonMath() {
          double dResult = 0;  
          dResult = nonMathMethod();
          return dResult;
    }
}

Class C then calls both, since they both make a static call to load the library will that matter in class C? Or is it better to have Class C call System.loadLibrary(...?

public class C{
    // declare the native code function - must match ndkfoo.c
    //  So is it beter to declare loadLibrary here than in each individual class?
    //static {
    //  System.loadLibrary("ndkfoo");
    //}
    //

    public C() {}

    public static void main(String[] args) {
        A a = new A();
        B b = new B();
        double result = a.getMath() + b.getNonMath();

    }
}

Answer 1

No, it doesn't matter. It's harmless to call loadLibrary() more than once in the same classloader.

From the documentation for Runtime.loadLibrary(String), which is called by System.loadLibrary(String):

   If this method is called more than once with the same library name, 
   the second and subsequent calls are ignored.

Answer 2

Its better to have the class which uses the library, load the library. If you have to caller load the library you make it possible to call the native methods without loading the library.