Calling a Method from another Class

[Bernard Shapiro]

I have a Customer class and an App class.
in the Customer class I have a setBalance() method which receives a double.
I wish to send the double from within the App class.
I have tried to do it like this:
Customer.setBalance(bal);
But I get this error:
"App.java": Error #: 308 : non-static method setBalance(double) cannot be referenced from a static context at line 84, column 18
what is the correct way to use this method from within the App class?

[Bernard Shapiro]

btw, both of these classes are in the same file App.java
-----------------
In the App Class:
switch (choice) {
case ADD_CUSTOMER: {
//Read in Blanace from user
System.out.print ("Input Balance: ");
double bal = (Keyboard.readDouble());

Customer.setBalance(bal);
}

----------
In the customer class:
//SET METHOD: stores balance
public void setBalance(double newBalance) {
balance = newBalance;
}

[Francis Siu]

hi Bernard
I think you call the setBalance() method in the main method or some static method,so that you need to add the static in the setBalance() method.
In your code

 
public  :eek:  static  :eek:  void setBalance(double newBalance) 
{
  balance = newBalance;
} 
 

If it is not clear,please post again
thanks

[Nick Delauney]

I think what you need to do is create a Customer object in your app class.
Customer myCustomer = new Customer();
then you can perform the method on that instance.
myCustomer.setBalance(bal);
keep in mine a Customer should have a balance atribute, in the customer class you should have
double bal;
However the previous poster also is correct - but it all depends on how you want to implement your code.
BTW:
In English the error is saying you did not create and object yet you want to use a method, and the method has not been created yet because its not static.
(Static meaning it is there in the class regardless of an instance of the class.)
your error:
App.java": Error #: 308 : non-static method setBalance(double) cannot be referenced from a static context at line 84, column 18