具有类实例变量的引用对象

import java.awt.Point;//from N o w  J a v a  . c o m


public class Main {

    public static void main(String[] arguments) {

        Point pt1, pt2;

        pt1 = new Point(100, 100);

        pt2 = pt1;


        pt1.x = 200;

        pt1.y = 200;

        System.out.println("Point1: " + pt1.x + ", " + pt1.y);

        System.out.println("Point2: " + pt2.x + ", " + pt2.y);

    }

}