###09.06_面向对象(多态中向上转型和向下转型)
* A:案例演示
* 详细讲解多态中向上转型和向下转型
Person p = new SuperMan();向上转型
SuperMan sm = (SuperMan)p;向下转型9
* D:案例演示
method(Animal a)
method(Cat c)
###09.08_面向对象(多态中的题目分析题)# #
* A:看下面程序是否有问题，如果没有，说出结果
*
class Fu {
public void show() {
System.out.println("fu show");
}
}
class Zi extends Fu {
public void show() {
System.out.println("zi show");
}
public void method() {
System.out.println("zi method");
}
}
class Test1Demo {
public static void main(String[] args) {
Fu f = new Zi();
f.method();
f.show();
}
}
* B:看下面程序是否有问题，如果没有，说出结果
* A a = new B();
* a.num;
class A {
int num = 3;
}
class B extends A {
int num = 2;
}
class C extends B {
public void show() {
super.show();
}
public void show2() {
System.out.println("你");
}
}
public class Test2DuoTai {
public static void main(String[] args) {
A a = new B();
a.show();