在错误的类型上调用泛型访问者

interface Element {
    <T> T accept(Visitor<T> visitor);
}

interface Visitor<T> {
    T visit(ConcreteElementA element);
    T visit(ConcreteElementB element);
}

class ConcreteElementA implements Element {
    public <T> T accept(Visitor<T> visitor) {
        return visitor.visit(this);
    }
}

class ConcreteElementB implements Element {
    public <T> T accept(Visitor<T> visitor) {
        return visitor.visit(this);
    }
}

Visitor<String> visitor = new Visitor<String>() {
    public String visit(ConcreteElementA element) {
        return "Visited A";
    }
    // Missing visit method for ConcreteElementB
};

Element element = new ConcreteElementB();
String result = element.accept(visitor); // 编译错误或运行时异常