Hi.

In the Javadoc of the "DiffBuilder" class[1]:
---CUT---
[...]
To use this class, write code as follows:

 public class Person implements Diffable<Person> {
   String name;
   int age;
   boolean smoker;
[...]
---CUT---

However, a common use-case would be that we can't directly
modify the class whose instances we want to compare.
Assuming that interfaces are given and non-modifiable (i.e.
they cannot implement "Diffable"):
---CUT---
public interface Content {
     double getValue();
}

public interface Container {
    Content[] getContentArray();
}
---CUT---
and the modifiable user code is similar to
---CUT---
public class MyContent implements Content {
    private final double c;

    public MyContent(double input) {
        c = input:
    }

    @Override
    public double getValue() {
        return c;
    }
}

public class MyContainer implements Container {
    private final Content[] contentArr;

    MyContainer(double ... inputs) {
        final int len = inputs.length;
        contentArr = new Content[len];
        for (int i = 0; i < len; i++) {
            contentArr[i] = new MyContent(inputs[i]);
        }
    }

    @Override
    public Content[] getContentArray() {
        return contentArr;
    }
}
---CUT---
how should I go about in order to get the "diff" between instances
of "MyContainer"?

Thanks,
Gilles

[1] 
https://commons.apache.org/proper/commons-lang/javadocs/api-release/org/apache/commons/lang3/builder/DiffBuilder.html

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