4. Parameters are Seen by their Own Method, Only



Answer:
Instance variables are used to store the state of an object. They hold values for as long as the object exists.





Parameters are Seen by their Own Method, Only







    

        

            
The formal parameters of a method can be seen only by the statements of their own method. This means that if a method tries to use a parameter of some other method, the compiler will find a syntax error.

            
Here is the CheckingAccount class again, this time with a new definition of the toString() method





    





    
        

        

        

            
                
public class CheckingAccount
{
  private String accountNumber;
  private String accountHolder;
  private int    balance;

  . . . .
  public void processDeposit( int amount )
  {    
    balance = balance + amount ; 
  }

  // modified toString() method
  public String toString()
  {
    return  "Account: " + accountNumber + "\tName: " + accountHolder + 
            "\tBalance: " +  amount ;
  }

}

            		
        

    







Question 4:
Is this toString() method correct?