multiple-interface-collision.java

class SwissArmyKnife implements Screwdriver, Corkscrew {
    public boolean canScrew(String item) {
//        return ITEM.equals(item); // can’t do this as ITEM is ambiguous.
        return Screwdriver.ITEM.equals(item) || Corkscrew.ITEM.equals(item);
    }
}

interface Screwdriver {
    public static String ITEM = "Screw";
    default void screw() {
        System.out.println("Screwing " + ITEM);
    }
}

interface Corkscrew {
    public static String ITEM = "Cork";
//    default void screw() { // can’t declare this as it clashes with Screwdriver.screw()
//        System.out.println("Screwing " + ITEM);
//    }
}