CODEWITHSUNDEEP
javainheritanceoverriding
purpule
purpule

Reputation: 116

Inheritance - What method is being called?

I have a class A that extends a class B.

A is defined like this, it also overrides a method of B:

class A extends B
{
    public A() {
        super();
    }

    @Override
    public void doSomething(){
        //does something
    }
}

B is defined like this:

public class B
{
    public B(){
        doSomething();
    }

    public void doSomething(){
        //does something
    }
}

So if I initialize an object of A, the constructor calls the one of the superclass that calls the method doSomething(). But which one will be executed? B's implementation or the overriden one in A?

Upvotes: 0

Views: 144

Answers (2)

Eugene
Eugene

Reputation: 120848

That is a common bug, only call final methods in constructor, the method from A will be called.

Btw Sonar(if you have it) will trigger a rule here saying that you should not call polymorphic methods inside a constructor.

Upvotes: 3

Guilherme Mussi
Guilherme Mussi

Reputation: 1057

If the class Overrides a method, then the overriden method will be called. Try the example below:

public class A {
 void doSomething() {
  System.out.println("a");
 }
}
public class B extends A {
 @Override
 void doSomething() {
  System.out.println("b");
 }
}
A a = new B();
a.doSomething(); // will print "b"

Upvotes: 0

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