1.

Write a program in Java to show the Diamond Problem.

Answer»

The Diamond Problem is a problem of Multiple inheritance. It is one of the major reasons why multiple inheritance is not supported in Java. Have a look at the diagram given below.

Here, class D extends from classes B and C and they extend from Class A. Let us say that class A has a function called print(). This function is overridden in Class B and C respectively. Now, when class D extends B and C both, say it calls super.print(). Which function should be called? This is an anomaly called the diamond problem or deadly diamond of death.

Java Code for Diamond Problem

class A {
public void print() {
System.out.println("Class A print method");
}
}

class B extends A {
@Override
public void print() {
System.out.println("Class B print method");
}
}

class C extends A {
@Override
public void print() {
System.out.println("Class C print method");
}
}

//multiple inheritance not allowed in Java
class D extends A,B {
@Override
public void print() {
System.out.println("Class D print method");
}
}

class Main {

public static void main(String args[]) {
// Your code goes here
D obj = new D();
obj.print();
}
}

Output

This compilation error occurs because multiple inheritance is not allowed in Java.


Discussion

No Comment Found

Related InterviewSolutions