public class HelloWorld 
{
	int data = 100;
	Sample sample = new Sample();
	Sample s1;
	Sample s2;

	HelloWorld()
	{
		 s1 = new Sample2();
		 s2 = new Sample2();
	}

	private static native void testArray(int[] arr);

	private static native void testArrayRegion(int[] arr);

	private static native int[] createIntArray();

	private static native String[] createObjectArray(String s1, String initial);

	private static native String testNewString();

	private static native void testString(String s);
	
	private static native int static_sum(Sample s, int i, int j);

	private native int sum(Sample s, int i, int j);

	private native static Sample testConstructors(Sample s, Sample dummy);

	native long testLong(long l);

	public native void test(int i, int j, String s);

	public native void displayHelloWorld();

	public native void exceptionTest(Exception e) throws Exception;

	static {
		System.loadLibrary("hello");
	}

	long longJavaMethod()
	{
		System.out.println("longJavaMethod() called in Java side");
		return -1000;
	}
    
	public static void main(String[] args) 
	{
		HelloWorld hw = new HelloWorld();
		
		hw.displayHelloWorld();		

		new HelloWorld().test(1, 10, "John");		

		hw.s2.run(10, 20, 30);

		int total = hw.sum(new Sample(), 10, 100);
		System.out.println("You expect to see 110 here: " + total);

		System.out.println("Calling constructors");
		Sample s = testConstructors(new Sample(), null);
		System.out.println("You expect to see 100 here: " + s.data);
		System.out.println("You expect to see 1000 here: " + s.sData);

		System.out.println("Calling testNewString()");
		String str = testNewString();
		System.out.println(str);		

		System.out.println("Calling testString()");
		str = "This is Christina and John";
		testString(str);

		// test array
		int[] a = {1, 2, 3, 4, 5};

		System.out.println("testArray()");
		System.out.println("Before: ");
		for (int i=0; i<a.length; i++) {
			System.out.print(a[i]);
			System.out.print(" ");
		}
		
		System.out.println("");

		testArray(a);
		System.out.println("After: ");

		for (int i=0; i<a.length; i++) {
			System.out.print(a[i]);
			System.out.print(" ");
		}

		System.out.println("\ncreateIntArray()");
		int[] b = createIntArray();
		for (int i=0; i<b.length; i++) {
			System.out.print(b[i]);
			System.out.print(" ");
		}

		System.out.println("\ncreateObjectArray()");
		String[] strs = createObjectArray("1", "John");
		for (int i=0; i<strs.length; i++) {
			System.out.print(strs[i]);
			System.out.print(" ");
		}

		int[] bbb = {1, 2, 3, 4, 5};
		testArrayRegion(bbb);

		System.out.print("\n");
		long l = hw.testLong(Long.MAX_VALUE);
		System.out.println("returned long: " +  Long.toHexString(l));

		l = hw.testLong(l);
		System.out.println("returned long: " +  Long.toHexString(l));

		try {
			Exception e = new Exception("This is an exception!");
			hw.exceptionTest(e);
		} catch (Exception e1) {
			System.out.println(e1.getMessage());
		}
    }
}