Polymorphic Arguments

[Niyas Ahmed Sheikh]

Hi,

I have tried the below sample coding to know how the polymorphic arguments are working.

  
class Employee
{
  
}
 
class Manager extends Employee
{
 
}
 
class Engineer extends Employee
{
     
}
 
class Tax extends Employee
{
 
  public void tax(Employee e)
  {
    if (e instanceof Manager)
    {
System.out.println("Tax for Manager");
    }
    else
    if (e instanceof Engineer)
    {
System.out.println("Tax for Engineer");
    }
    else
System.out.println("Tax for Employee");
   }
 
   public static void main(String args[])
   {
 
     Employee e = new Employee();
     Engineer er = new Engineer();  
     Manager m = new Manager();
 
     Tax t = new Tax();
     t.tax(m);     
   }
} 

By the above coding, I'm not getting any error.

But the below codings, raise the error. Just I have included the System.out.println statement to know the flow of thr pgm.

  
class Employee
{
  System.out.println("Manager Section");
}
 
class Manager extends Employee
{
  System.out.println("Manager Section");
}
 
class Engineer extends Employee
{
   System.out.println("Manager Section");  
}
 
class Tax extends Employee
{
 
  public void tax(Employee e)
  {
    if (e instanceof Manager)
    {
System.out.println("Tax for Manager");
    }
    else
    if (e instanceof Engineer)
    {
System.out.println("Tax for Engineer");
    }
    else
System.out.println("Tax for Employee");
   }
 
   public static void main(String args[])
   {
 
     Employee e = new Employee();
     Engineer er = new Engineer();  
     Manager m = new Manager();
 
     Tax t = new Tax();
     t.tax(m);     
   }
} 

Any other advise/desc/hidden facts about the polymorphic arguments are WELCOME!

[Niyas Ahmed Sheikh]

Sorry..forget to give the error message

And here we go!!!

Tax.java:3: <identifier> expected
  System.out.println("Manager Section");
                    ^
Tax.java:8: <identifier> expected
  System.out.println("Manager Section");
                    ^
Tax.java:13: <identifier> expected
   System.out.println("Manager Section");
                     ^
Tax.java:3: cannot resolve symbol
symbol  : class out
location: class java.lang.System
  System.out.println("Manager Section");
        ^
Tax.java:8: cannot resolve symbol
symbol  : class out
location: class java.lang.System
  System.out.println("Manager Section");
        ^
Tax.java:13: cannot resolve symbol
symbol  : class out
location: class java.lang.System
   System.out.println("Manager Section");
         ^
6 errors

[Mani Ram]

Originally posted by Niyas Ahmed Sheikh:
Just I have included the System.out.println statement to know the flow of thr pgm.

You can't have statements like that. The statements should be present inside a method, or a constructor or a static block...

For example, you should change your Manager class as

class Manager extends Employee
{
public Employee() {
  System.out.println("Manager Section");
}
}
 

[Steve Simon Joseph Fernandez]

Hi,

Executable statements (in this case, System.out.println()) have to be placed inside a method. Put your println's inside the class constructor.

_steve.