清华大学：JAVA教学课件：5-6

程序5-6
public class Point {
void print() {
System.out.println("This is the superclass!");
}
public static void main(String args[]){
Point superp = new Point ();
superp.print();
Point3d subp = new Point3d();
subp.print();
}
}
class Point3d extends Point {
void print() {
System.out.println("This is the subclass!");
super.print();
}
}