Deprecated method in two interfaces

Question

I have an interface with a deprecated method:

public interface A
{
    @Deprecated
    public String getUUID();
}

And another interface with the same but non-deprecated method:

public interface B
{
    public String getUUID();
}

A class that implements both interfaces:

public class MyBean implements A, B
{
    @Override
    public String getUUID()
    {
        return UUID.randomUUID().toString();
    }
}

There is a warning during the compilation of MyBean:

javac -Xlint:deprecation MyBean.java A.java B.java
MyBean.java:8: warning: [deprecation] getUUID() in A has been deprecated
    public String getUUID()
                  ^
1 warning

I cannot really understand why is this warning necessary when I implement B which defines the non-deprecated method...

Answer 1

You already answered your question.

You get the warning because you do implement A, which has the @Deprecated annotation. See here:

@Deprecated annotation indicates that the marked element is deprecated and should no longer be used. The compiler generates a warning whenever a program uses a method, class, or field with the @Deprecated annotation.

I don't see anything wrong with that warning. It should be there as you are really implementing a Deprecated method that's found in one of the interfaces you're implementing.