Discussion Forum : Introduction To Methods And Streams
Question -
class A {
int i;
public void display() {
System.out.println(i);
}
}
class B extends A {
int j;
public void display() {
System.out.println(j);
}
}
class Dynamic_dispatch {
public static void main(String args[])
{
B obj2 = new B();
obj2.i = 1;
obj2.j = 2;
A r;
r = obj2;
r.display();
}
}
What is the output of this program?
class A {
int i;
public void display() {
System.out.println(i);
}
}
class B extends A {
int j;
public void display() {
System.out.println(j);
}
}
class Dynamic_dispatch {
public static void main(String args[])
{
B obj2 = new B();
obj2.i = 1;
obj2.j = 2;
A r;
r = obj2;
r.display();
}
}
Answer: Option B
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r is reference of type A, the program assigns a reference of object obj2 to r and uses that reference
to call function display() of class B.
output:
$ javac Dynamic_dispatch.java
$ java Dynamic_dispatch
2
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