Discussion Forum : Introduction To Methods And Streams
Question -
class A {
public void display() {
System.out.println("A");
}
}
class B extends A {
public void display() {
System.out.println("B");
}
}
class Dynamic_dispatch {
public static void main(String args[])
{
A obj1 = new A();
B obj2 = new B();
A r;
r = obj1;
r.display();
r = obj2;
r.display();
}
}
What is the output of this program?
class A {
public void display() {
System.out.println("A");
}
}
class B extends A {
public void display() {
System.out.println("B");
}
}
class Dynamic_dispatch {
public static void main(String args[])
{
A obj1 = new A();
B obj2 = new B();
A r;
r = obj1;
r.display();
r = obj2;
r.display();
}
}
Answer: Option A
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Call to display function of class A and class B is made by using dynamic method dispatch, by
using this method a call to an overridden function is resolved at run time, rather than at compilation time.
output:
$ javac Dynamic_dispatch.java
$ java Dynamic_dispatch
A B
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