Programming Example
instanceof operator, Understanding Real use of instanceof in java
Study this program carefully to understand the logic, output, and explanation in a structured way.
interface Atnyla{}
class A implements Atnyla{
public void a(){
System.out.println("it is a method");
}
}
class B implements Atnyla{
public void b(){
System.out.println("it is b method");
}
}
class Call{
void invoke(Atnyla p){//upcasting
if(p instanceof A){
A obj=(A)p;//Downcasting
obj.a();
}
if(p instanceof B){
B obj1=(B)p;//Downcasting
obj1.b();
}
}
}//end of Call class
class InstanceOf{
public static void main(String args[]){
Atnyla p=new B();
Call c=new Call();
c.invoke(p);
}
}
it is b method
Press any key to continue . . .
First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.