Could someone please explain why this happening:
class Apple {
String type;
setType(){
System.out.println("inside apple class");
this.type = "apple";
}
}
class RedApple extends Apple {
String type;
setType() {
System.out.println("inside red-apple class");
this.type = "redapple";
}
}
int main {
RedApple red = new RedApple();
Apple apple = (Apple) red;
apple.setType();
}
But the output produced is:
"inside red-apple class”
Why does the .setType() method execute the sub-class method, and not the super-class method, even though I am up-casting, as can be seen?
That's because that's how polymorphism works in Java: it always uses the most-derived version of the method, which overrides other versions.
The only way to get the base-class version is to use super.setType within the most-derived override.