java 对象的上转型对象(父类)

Example5_10.java

class  类人猿 {
   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+"***");
   }
}
public class Example5_10 {
   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);
   }
}