public class Demonstration {	
	static private int counter = 0;	
	public Demonstration() {	
		++counter;  // another construction has been performed	
	}	
	// main(): application entry point	
	public static void main(String[] args) {	
		Demonstration d1 = new Demonstration();	
		Demonstration d2 = new Demonstration();	
		Demonstration d3 = new Demonstration();	
		System.out.println(Demonstration.counter);	
	}	
}