Enthuware

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Even in case of interfaces, a subinterface cannot override a default method with a static method.

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You can, however, have a default method in a subinterface with the same signature as a static method of its super interface because a static method of an interface can only be called using that interface's name.

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interface I{
default void dm(){ }
static void sm(){ }
}

interface SubI extends I{
static void dm(){ } //won't compile, error: dm() in SubI clashes with dm() in I
default void sm(){ }  //valid 
}

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package mypackage;

interface iii {
    default String getS() {
        return "111";
    }
}

interface myInt extends iii {
    String value = "AValue";

    default String getS() {
        return "";
    }

    String getS();
}

public class TestClass {
    public static void main(String[] args) {
        TestClass t = new TestClass();
    }
}

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/Users/djunior/IdeaProjects/untitled/src/mypackage/TestClass.java:16:12
java: method getS() is already defined in interface mypackage.myInt