class 类人猿
{ private int n=100;
void crySpeak(String s)
{ System.out.println(s);
}
}
class People extends 类人猿
{ void computer(int a,int b)
{ int c=a*b;
System.out.println(c);
}
void crySpeak(String s)
{ System.out.println("**"+s+"**");
}
}
class Example4_21
{ public static void main(String args[])
{ 类人猿 monkey=new People(); //monkey是People对象的上转型对象。
monkey.crySpeak("I love this game");
People people=(People)monkey; //把上转型对象强制转化为子类的对象。
people.computer(10,10);
}
}