Name Clash

NameClashTest.java

public class NameClashTest {
    interface I {
        void foo(int x);

        private I foo() {
            return null;
        }
        private void foo(int x) {} // Invalid: method foo(int) is already defined in interface NameClashTest.I
    }

    interface J extends I {
        private J foo() {
            return null;
        }
    }

    interface K extends J {
        void foo();
    }
}