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Avoid duplicating method in two already extended classes that implement a common interface in java

I was asked this question in a java interview, but I couldn't find the answer anywhere.

X Y
| |
A B

Interface I{
m1();
}

Class A and Class B are extended from classes X and class Y respectively.

X and Y cannot be changed. Interface A and B i and method m1 () have the same definition in both.

How to avoid code duplication.

Java 8 cannot be used as we can define methods in java-8 interfaces.

Thanks in advance.

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2 answers


This is a terrible question, but a good way would be to make a static method (which contains m1 functions) in A.java

or B.java

, and just call that method in A#m1

and B#m1

.

This is much easier than creating another class.

A.java



@Override
public void m1() {
    methodHelper();
}

public static void methodHelper() {
    // Code goes here.
}

B.java

@Override
public void m1() {
    A.methodHelper();
}
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I agree with what Gabe Sechan has to say.

Let another class (class C) implement the m1 () method defined in the interface.



Class A and class B will have an instance of class C. This will allow you to use this m1 () method, where class C, implemented without class A and class B, has duplicate m1 () methods.

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