Question

I have a code as below:

Class A{

protected void method1(){

//i have  logic which will fetch the results from the database
}

}

and i have one more class which extends the class A:

Class B extends A{

    //some logic

    }

Now how many database calls are executed? one or two?

Answer 1

If you do:

new B().method1()

method1() is called exactly once on behalf of B object. What the JVM is doing is it tries to find B.method1() first. If it was overriden in B, it would call it (and completely skip A.method1()). But since B is not overriding it, original A.method1() is called transparently.

If B would override method1() the only way to call original A.method1() would be to call super.method1() inside B.