Unexpected type + non-static variable this cannot be referenced from a static context errors?

Question

My code does not compile. How can I resolve the errors?

import java.util.*; public class BankAccount{ private double balance; public BankAccount(double b) { balance = b; } public double getBalance(){ return balance; } public void deposit(double d){ balance += d; } public boolean withdraw(double d){ if(d > balance){ return false; } else { balance -= d; return true; } } public class SavingsAccount extends BankAccount{ private double interest; public SavingsAccount(double k, double inRate){ super(k); interest = inRate; } public void gainInterest(){ super.getBalance() = super.getBalance() * interest; } } public static void main(String[] args) { SavingsAccount test = new SavingsAccount(1000, .05); test.gainInterest(); System.out.println(test.getBalance()); }

The following errors are

I get the unexpected type error at super.getBalance() = super.getBalance() * interest; and the "non-static variable this cannot be referenced from a static context" at SavingsAccount test = new SavingsAccount(1000, .05);

note: never do this in a real bank. Why not use Double or Float to represent currency — harshtuna
– harshtuna, Commented Feb 26, 2015 at 1:17

MadProgrammer · Accepted Answer · 2015-02-26 01:02:37Z

You can't assign a value to a method.

You will need to assign the result to a variable or pass the result to another method, in this case you can use deposit, something like...

public void gainInterest(){ deposit(super.getBalance() * interest); }

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