Java OCA OCP Practice Question 3068

class Shape {
   String name;/*from w w w .j  av a  2s  . c  om*/

   Shape(String n) {
      name = n;
   }
}

class Rectangle extends Shape {
   public boolean equals(Object o) {
      Rectangle n = (Rectangle) o;
      if (name.equals(n.name))
         return true;
      return false;
   }

   public int hashCode() {
      return name.length();
   }

   Rectangle(String s) {
      super(s);
   }
}

public class Main extends Rectangle {
   public static void main(String[] args) {
      Shape n1 = new Shape("bob");
      Shape n2 = new Shape("bob");
      Rectangle a1 = new Rectangle("fred");
      Rectangle a2 = new Rectangle("fred");
      Main s1 = new Main("jill");
      Main s2 = new Main("jill");
      System.out.print(n1.equals(n2) + " " + (n1 == n2) + " | ");
      System.out.print(a1.equals(a2) + " " + (a1 == a2) + " | ");
      System.out.println(s1.equals(s2) + " " + (s1 == s2));
   }

   Main(String s) {
      super(s);
   }
}