constructors

[droidus]

there is a cash register code, and here is what i have so far:

private double balance;

   /**
      Constructs a bank account with a zero balance.
   */
   public double BankAccount()
   {   
      balance = 0;
		return balance;
   }

   /**
      Constructs a bank account with a given balance.
      @param initialBalance the initial balance
   */
   public double BankAccount(int initialBalance)
   {   
      balance = initialBalance;
		return balance;
   }

   /**
      Deposits money into the bank account.
      @param amount the amount to deposit
   */
   public void deposit(double amount)
   {  
      double newBalance = balance + amount;
      balance = newBalance;
   }

   /**
      Withdraws money from the bank account.
      @param amount the amount to withdraw
   */
   public void withdraw(double amount)
   {   
      double newBalance = balance - amount;
      balance = newBalance;
      
		balance = balance-1;

   }

   /**
      Gets the current balance of the bank account.
      @return the current balance
   */
   public double getBalance()
   {   
      return balance;
   }

to test the data, they use:

public class BankAccountTester
{
   public static void main(String[] args)
   {
      BankAccount account1 = new BankAccount(1000);
      account1.withdraw(100);
      System.out.println(account1.getBalance());
      System.out.println("Expected: 899");

      BankAccount account2 = new BankAccount();
      account2.deposit(1000);
      account2.withdraw(100);
      account2.withdraw(100);
      System.out.println("Balance: " + account2.getBalance());
      System.out.println("Expected: 798");      
   }
}

i get a error message when running it. i made sure that my constructor is able to take in the int, so i am not sure why it doesn't like it:

symbol**:*constructor*BankAccount(int)
location:*class*BankAccount
******BankAccount*account1*=*new*BankAccount(1000);
*****************************^
1*error

[sunde887]

That's not what a constructor should look like. A constructor does not have a return type.

public double BankAccount()

is wrong, a constructor should look like this

public BankAccount()

so they just do initialization and they do not return anything. See if these changes help you out. Also, I consider you read the oracle tutorials on constructors.

Google the phrase. "java tutorial constructors"

[droidus]

i got it. thanks. i will probably have some more questions on these since they will be getting harder.

[sunde887]

Glad to have helped. Please mark your thread solved with the thread tools at the top of the page.