class Bird {
static void talk() { System.out.print("chirp "); }
}
class Parrot extends Bird {
static void talk() { System.out.print("hello "); }
public static void main(String [] args) {
Bird [] birds = {new Bird(), new Parrot()};
for( Bird b : birds)
b.talk();
}
}
結(jié)果為:()
A.chirp chirp
B.chirp hello
C.hello hello
D.編譯失敗