相关疑难解决方法(0)

我有一般情况的代码：

public class A {
    public String show(A obj) {
        return ("A and A");
    }
}

public class B extends A {
    public String show(B obj) {
        return ("B and B");
    }

    public String show(A obj) {
        return ("B and A");
    }
}

public class C extends B {

}

public class Test {
    public static void main(String[] args) {
        A a = new B();
        B b = new B();
        C c = new C();

        System.out.println("1--" + a.show(b));
        System.out.println("2--" + …