ThreeRef.java

public class ThreeRef {
    public static void main(String[] argv) {
        Point a = new Point();
        a.setX(10);
        Point b = a;
        Point c = b;
        System.out.println("a: " + a.getX() + ", b: " + b.getX() + ", c: " + c.getX());
        
        b.setX(100);
        System.out.println("a: " + a.getX() + ", b: " + b.getX() + ", c: " + c.getX());
    }
}