jlab0501_2.java

来自「计算机系学习java的专用ppt」· Java 代码 · 共 53 行

class Pet{
   protected String name;
   public Pet(String n){
     name=n;
     }
   public String getName(){
     return name;
     }
   public String move(){
     return "run";
     }
   public String speak(){
     return "";
     }
   public String toString(){
     return "My pet"+name;
     }
   }
class Dog extends Pet{
   protected int weight;
   public Dog(String s){
      super(s);
      }
   public void setWeight(int x){
       weight=x;}
   public int getWeight(){
       return weight;}
         
   public String speak(){
     return "woof woof"; }    
           
    }
  class JLab0501_2{
    public static void main(String[] args){
      Pet mypet=new Pet("George");
      Dog mydog=new Dog("spot");
      Dog snoopy=new Dog("spot");
      System.out.println(mypet.toString()+"\n"+"speak:"+
                         mypet.speak()+"\n"+mypet.move()+" "+
                         mypet.getName()+"\n");
                         
      System.out.println(mydog.toString()+"\n"+"speak:"+
                         mydog.speak()+"\n"+mydog.move()+" "
                         +mydog.getName()+"\n"); 
       snoopy.setWeight(10);
       System.out.println(snoopy.toString()+"\n"+"speak:"+
                         snoopy.speak()+"\n"+snoopy.move()+" "+
                         snoopy.getName()+"\n"+"weight"+snoopy.getWeight());
                                          
       }
      }