Overriding

Question

Is Overriding is static or dynamic?
The method call is decided during compile time or run time?
public Class SuperClass{
public void methodA(){
System.out.println("Super class method");
public Class SubClass{
public void methodA(){
System.out.println("Sub class method");
in the main method, i create the instances as follows
SuperClass super = new SuperClass();
SubClass sub = new SubClass();
if i invoke the method , as super.methodA() then output will be "Super class method" and if sub.methodA() then output will be "Sub class method". This is obvious.
And if i create a instance of the sub class using the super class reference and invoke the method like
SuperClass super = new SubClass();
super.methodA();
output wll be "Sub Class method".
Is this call is decide during run time or compile time??????

Answer 1

There is an "exception", though, when combining overriding and overloading.
public class Test {
  public static void main(String [] args) throws Exception {
    X x = new Y();
    x.doThing(""); // prints "X"
  static class X {
    void doThing(Object o) { System.out.println("X"); }
  static class Y extends X {
    void doThing(String s) { System.out.println("Y-String"); }
    void doThing(Integer i) { System.out.println("Y-Integer"); }
}