Page 213 - AP Computer Science A, 7th edition

Polymorphism applies only to overridden methods in subclasses.
Using super in a Subclass
A subclass can call a method in its superclass by using super. Suppose that the superclass method then calls another method that has been overridden in the subclass. By polymorphism, the method that is executed is the one in the subclass. The computer keeps track and executes any pending statements in either method.
Example
public class Dancer {
public void act() {
System.out.print (" spin"); doTrick(); }
public void doTrick() {
System.out.print (" float"); }
}
public class Acrobat extends Dancer {
public void act() {
super.act();
System.out.print (" flip"); }
public void doTrick() {
System.out.print (" somersault"); }
}