Java Inheritance Puzzle

Imagine we have one interface and these classes:

interface SuperType {
    void test();
}


class DefaultSuperType implements SuperType{
    @Override
    void test(){
        System.out.println("0")
    }
}

class ChildOfSuperType extends DefaultSuperType{
    @Override
    void test(){
        System.out.println("1")
    }
}

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And then we execute this piece of code

SuperType superType = new ChildOfSuperType();
DefaultSuperType defaultSuperType = (DefaultSuperType) superType;
defaultSuperType.test()

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Do you know what will be printed?

原文链接：Java Inheritance Puzzle