hw5/tracing/TestFruits.java

public class TestFruits  
{  
   public static void main(String[] args)  
   {  
      Apple a = new Apple(2);  
      System.out.println(Apple.count);  
      System.out.println();  
      
      Fruit[] fr = new Fruit[3];  
      fr[0] = a;  
      fr[1] = new RedDelicious();  
      fr[2] = new Fruit(4);  
      System.out.println();  
      
      System.out.println("Using array fr:  ");  
      for(int  i  =  0;  i  <  fr.length;  i++)  
      {  
         fr[i].display();  
         System.out.println(Apple.count);  
         System.out.println();
      }    
   }
}

class Fruit  
{              
   public int f;  
   
   public Fruit(int f)  
   {  
      System.out.println("Fruit");  
      this.f  =  f;  
   }  
   
   public int getF()  
   {  
      return this.f;  
   }  
   
   public void f1()  
   {  
      System.out.println("FRUIT f1");  
   }  
   
   public void f2()  
   {  
      f1();  
      System.out.println("FRUIT f2");  
   }  
   
   public void display()  
   {  
      System.out.println("display method from Fruit invoked");  
      f2();  
   }  
}

class Apple extends Fruit  
{              
   public static int count = 0;  
   
   public Apple(int a)  
   {  
      super(a);  
      System.out.println("Apple");  
      count = count + getF();  
   }  
   
   public void f1()  
   {  
      System.out.println("Apple f1");  
   }  
   
   public void f2()  
   {  
      f1();  
      System.out.println("Apple f2");  
      super.f1();            
   }  
   
   public void display()  
   {  
      System.out.println("display method from Apple invoked");  
      f2();  
   }      
}  

class RedDelicious extends Apple  
{              
   public static int count;  
   
   public RedDelicious()  
   {  
      super(3);  
      System.out.println("RedDelicious");  
      count = count + getF();  
   }  
   
   public void f1()  
   {  
      System.out.println("RedDelicious f1");  
   }  
   
   public void f2()  
   {  
      f1();  
      System.out.println("RedDelicious f2");  
      super.f1();          
   }  
   
   public void display()  
   {  
      System.out.println("display method from RedDelicious invoked");  
      f1();  
   }  
}