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Accessing Grandparent’s member in Java using super

Directly accessing Grandparent’s member in Java:

Predict the output of following Java program.

// filename Main.java
class Grandparent {
    public void Print() {
        System.out.println("Grandparent's Print()");
    }
}
   
class Parent extends Grandparent {
    public void Print() {       
        System.out.println("Parent's Print()");
    }
}
   
class Child extends Parent {
    public void Print() {
        super.super.Print();  // Trying to access Grandparent's Print()
        System.out.println("Child's Print()");
    }
}
   
public class Main {
    public static void main(String[] args) {
        Child c = new Child();
        c.Print();
    }
}

Output: Compiler Error
There is error in line “super.super.print();”. In Java, a class cannot directly access the grandparent’s members. It is allowed in C++ though. In C++, we can use scope resolution operator (::) to access any ancestor’s member in inheritance hierarchy. In Java, we can access grandparent’s members only through the parent class. For example, the following program compiles and runs fine.

// filename Main.java
class Grandparent {
    public void Print() {
        System.out.println("Grandparent's Print()");
    }
}
   
class Parent extends Grandparent {
    public void Print() {
        super.Print();
        System.out.println("Parent's Print()");
    }
}
   
class Child extends Parent {
    public void Print() {
        super.Print();
        System.out.println("Child's Print()");
    }
}
   
public class Main {
    public static void main(String[] args) {
        Child c = new Child();
        c.Print();
    }
}

Output:

Grandparent's Print()
Parent's Print()
Child's Print()

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.



This article is attributed to GeeksforGeeks.org

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