Sample1.java

public class Sample1 {

    // --- Native methods
    public native int intMethod(int n);
    public native boolean booleanMethod(boolean bool);
    public native String stringMethod(String text);
    public native int intArrayMethod(int[] intArray);


    // --- Main method to test our native library
    public static void main(String[] args) {
        System.loadLibrary("Sample1");
        Sample1 sample = new Sample1();
        int square = sample.intMethod(5);
        boolean bool = sample.booleanMethod(true);
        String text = sample.stringMethod("java");
        int sum = sample.intArrayMethod(new int[] {1, 1, 2, 3, 5, 8, 13});

        System.out.println("intMethod: " + square);
        System.out.println("booleanMethod: " + bool);
        System.out.println("stringMethod: " + text);
        System.out.println("intArrayMethod: " + sum);
    }
}