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// This example illustrates how C++ classes can be used from Java using SWIG.
// The Java class gets mapped onto the C++ class and behaves as if it is a Java class.
public class main {
static {
try {
System.loadLibrary("example");
} catch (UnsatisfiedLinkError e) {
System.err.println("Native code library failed to load. See the chapter on Dynamic Linking Problems in the SWIG Java documentation for help.\n" + e);
System.exit(1);
}
}
public static void main(String argv[])
{
// ----- Object creation -----
System.out.println( "Creating some objects:" );
Circle c = new Circle(10);
System.out.println( " Created circle " + c );
Square s = new Square(10);
System.out.println( " Created square " + s );
// ----- Access a static member -----
System.out.println( "\nA total of " + Shape.getNshapes() + " shapes were created" );
// ----- Member data access -----
// Notice how we can do this using functions specific to
// the 'Circle' class.
c.setX(20);
c.setY(30);
// Now use the same functions in the base class
Shape shape = s;
shape.setX(-10);
shape.setY(5);
System.out.println( "\nHere is their current position:" );
System.out.println( " Circle = (" + c.getX() + " " + c.getY() + ")" );
System.out.println( " Square = (" + s.getX() + " " + s.getY() + ")" );
// ----- Call some methods -----
System.out.println( "\nHere are some properties of the shapes:" );
Shape[] shapes = {c,s};
for (int i=0; i<shapes.length; i++)
{
System.out.println( " " + shapes[i].toString() );
System.out.println( " area = " + shapes[i].area() );
System.out.println( " perimeter = " + shapes[i].perimeter() );
}
// Notice how the area() and perimeter() functions really
// invoke the appropriate virtual method on each object.
// ----- Delete everything -----
System.out.println( "\nGuess I'll clean up now" );
// Note: this invokes the virtual destructor
// You could leave this to the garbage collector
c.delete();
s.delete();
System.out.println( Shape.getNshapes() + " shapes remain" );
System.out.println( "Goodbye" );
}
}
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