trouble writing if statement with combo box

[celeste]

Hello,
This is my first post and I'm very new to programming. I'm working on assignment for a class where I'm creating a home utility auditor. Basically the user has to pick from a list of appliances and then input various fields to calculate a total cost. When the user chooses "washer" from the list of appliances, they must enter in values for 2 separate fields, and will then click calculate to get total cost. I've been trying to implement this through an if, else statement, but it's not wanting to calculate a total cost and I'm running into errors. I've put the code below. Any help would be greatly appreciated. Thank you!

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// The calculate button will multiply the 3 fields that the user inputs:
//cost*Kw used*hours used=total cost of operation
float num1,num2, num3, result;
//now, parse the text to a type float
num1= Float.parseFloat (costField.getText ());
num2= Float.parseFloat (kilowattsField.getText ());
num3= Float.parseFloat (hoursField.getText ());
result= (float) (num1*num2*num3);
totalCost.setText(String.valueOf(result));
float num4, num5;
num4= Float.parseFloat (gallonsField.getText ());
num5= Float.parseFloat (costgallonsField.getText ());


if (jComboBox1.getSelectedItem().equals("Washer"))
{
result= (float) (num4*num5*num3);
totalCost.setText(String.valueOf(result));
}
else {
result= (float) (num1*num2*num3);
totalCost.setText(String.valueOf(result));
}

}

[gimbal2]

If you run into errors, don't you think it would be a good idea to post those errors?