Problem with OOP - Inheritance

**connex** · December 14th, 2009, 08:39 PM

Basically I've made 4 classes, 1 main class, which 3 classes are then extended by. This is the main class file:

public class Account
{   
     private float balance;
 
    float getBalance()
    {
        return balance;
    }   
 
}

A class file that extends on this is:

public class Second extends Account
{
 
     private float balance;
 
    public Loan(float loanBalance)
    {
        balance = loanBalance;
    }
 
}

My main class file is:

public class Main {
 
    public static void main(String[] args)
    {
       Second JoeLoan = new Second(2000);
       float f = JoeLoan.getBalance();
      System.out.println(f);
    }
}

This should ideally output 2000.0, however it outputs 0.0... any idea what could be wrong?

**copeg** · December 14th, 2009, 11:11 PM

Look closely at your Second class. It overrides the parent class variable, and so the parent class function will return the balance variable available to it (which is never set, and so will be zero).

public class Second extends Account
{
 
     private float balance;//you are overriding the variable from the parent class. Best to omit this line
 
    public Loan(float loanBalance)//Should this be Second and not Loan?
    {
        balance = loanBalance;
    }
 
}

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