Question

Consider the following code:

public class Bay extends Lake {
public void method1() {
     System.out.println("Bay 1");
     super.method2();
}

  public void method2() {
       System.out.println("Bay 2");
   }
}

//*********************************

class Pond {
  public void method2() {
         System.out.println("Pond 2");
  }
}

//**************************

class Ocean extends Bay {
        public void method2() {
                 System.out.println("Ocean 2");
        }
}

//*********************************

class Lake extends Pond {
        public void method3() {
            System.out.println("Lake 3");
            method2();
      }
}

//****************************
class Driver
{
public static void main(String[] args)
{
    
   Object var4 = new Bay(); 
   Lake var5 = new Bay();
    
  // the following lines of code are causing wither syntax or runtime error
    
   // var4.method2();  error 1
 
  // ((Ocean) var5).method1();  error 2

}
}

Answer the following question.

Identify the cause of the error is it run time error or syntax error.

Explain why the error is happening

provide code to fix the problem. Do not change the declaration or the instantiation to fix the issue.

Answer 1

class Bay extends Lake {
   public void method1() {
       System.out.println("Bay 1");
       super.method2();
   }

   public void method2() {
       System.out.println("Bay 2");
   }
}

class Pond {
   public void method2() {
       System.out.println("Pond 2");
   }
}

class Ocean extends Bay {
   public void method2() {
       System.out.println("Ocean 2");
   }
}

class Lake extends Pond {
   public void method3() {
       System.out.println("Lake 3");
       method2();
   }
}

public class Driver {
   public static void main(String[] args) {

       Object var4 = new Bay();
       Lake var5 = new Bay();

       // the following lines of code are causing wither syntax or runtime error
      
       // Compile time error because here var4 is reference of class Object so method4 does not have declaration in class Object
       // so we will get compilation error
         
       ((Bay)var4).method2();

       // Here the var5 is pointing to Object of class Bay but we are trying to cast it to Ocean here it is referencing with Lake so there is no relationship so
       // it will give ClassCastException
       ((Bay)var5).method1();
   }
}

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