Question

Consider the below excerpt of a Java program. Fill in each of the blanks
(____) with the value returned by the method call that is given after the
== operator.
              
public class AShape
{   
   public int match(AShape p)        { return 1; }
}
public class Rectangle extends AShape
{  
   public int match(AShape p)        { return 2; }
   public int match(Rectangle p)   { return 3; }
}
public class Square extends Rectangle
{  
   public int match(Rectangle p)   { return 4; }
   public int match(Square p)        { return 5; }
}
/* .. */
AShape        a1 = new AShape();
AShape        a2 = new Rectangle();
AShape        a3 = new Square();
Rectangle r1 = new Rectangle();
Rectangle r2 = new Square();
Square        s1 = new Square();

____ == a3.match(r1)
____ == r1.match(a3)
____ == a2.match(a2)
____ == a2.match(a1)
____ == a1.match(a2)

____ == s1.match(s1)
____ == r2.match(r1)
____ == r1.match(r2)
____ == r2.match(a3)
____ == a3.match(r2)

Answer 1

public class AShape
{   
public int match(AShape p) { return 1; }
}
public class Rectangle extends AShape
{
public int match(AShape p) { return 2; }
public int match(Rectangle p) { return 3; }
}
public class Square extends Rectangle
{
public int match(Rectangle p) { return 4; }
public int match(Square p) { return 5; }
}
/* .. */
AShape a1 = new AShape();
AShape a2 = new Rectangle();
AShape a3 = new Square();
Rectangle r1 = new Rectangle();
Rectangle r2 = new Square();
Square s1 = new Square();

2 == a3.match(r1)
2 == r1.match(a3)
2 == a2.match(a2)
2== a2.match(a1)
1== a1.match(a2)
5== s1.match(s1)
4 == r2.match(r1)
3 == r1.match(r2)
2 == r2.match(a3)
2== a3.match(r2)

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