インタフェースおよびクラスの継承

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Ancestor.java
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public interface Ancestor {
    public void say();
}
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Descendent.java
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public interface Descendent extends Ancestor {

    public void respectFathers();
}
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MyAbstractWorker.java
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public abstract class MyAbstractWorker implements Descendent {

    abstract protected void work();
}
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MyConcreteWorker.java
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public class MyConcreteWorker extends MyAbstractWorker {

    public void work() {
        System.out.println ( this.getClass() );
    }

    public void say() {
        System.out.println ( "HELLO!" );
    }

    public void respectFathers() {
        System.out.println ( "I will respect my anscestors!" );
    }
}
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