Thread: My program is not displaying the answer :(

Hey guys I'm a little lost at the moment. I'm pretty sure everything is functioning properly, but my answer will not display at all. This is my first Java "multi-class" program... and I have to say I'm a little confused as to its exact purpose. BUT nonetheless here is my following code:

/*
	program:AcmeSelfServe
	name: Jacob Bosiljevac
	date: July.2014
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;
import java.text.DateFormat;
import java.util.Date;
 
public class AcmeSelfServe extends JFrame
{
	// declarations
	Color black = new Color(0, 0, 0);
	Color white = new Color(255, 255, 255);
	Color light_gray = new Color(192, 192, 192);
 
	DecimalFormat decimalFormat;
	DateFormat dateFormat;
	SalesAmount salesAmount;
 
	JRadioButton regularJRadioButton;
   JLabel regularJLabel;
 
	JRadioButton premiumJRadioButton;
   JLabel premiumJLabel;
 
   JRadioButton superJRadioButton;
   JLabel superJLabel;
 
	ButtonGroup displayButtonGroup;
 
	JLabel numberOfGallonsJLabel;
	JTextField numberOfGallonsJTextField;
 
	JLabel totalJLabel;
	JTextField totalJTextField;
 
 
	// controls
	JButton enterJButton;
	JButton clearJButton;
	JButton closeJButton;
 
	// variables & constants
	float saleAmount;
	int quantityOfItem;
	float gasRate;
 
	double salesSubTotal;
 
	float totalAmountOfSale;
 
   	public AcmeSelfServe()
   	{
      		createUserInterface();
   	}
 
   	public void createUserInterface()
   	{
		Container contentPane = getContentPane();
		contentPane.setBackground(white);
		contentPane.setLayout(null);
 
		// inputs
 
		numberOfGallonsJLabel = new JLabel();
		numberOfGallonsJLabel.setBounds(50, 50, 150, 20);
		numberOfGallonsJLabel.setFont(new Font("Default", Font.PLAIN, 12));
		numberOfGallonsJLabel.setText("Number of Gallons");
		numberOfGallonsJLabel.setForeground(black);
		numberOfGallonsJLabel.setHorizontalAlignment(JLabel.RIGHT);
		contentPane.add(numberOfGallonsJLabel);
 
		numberOfGallonsJTextField = new JTextField();
		numberOfGallonsJTextField.setBounds(210, 50, 50, 20);
		numberOfGallonsJTextField.setFont(new Font("Default", Font.PLAIN, 12));
		numberOfGallonsJTextField.setHorizontalAlignment(JTextField.CENTER);
		numberOfGallonsJTextField.setForeground(black);
		numberOfGallonsJTextField.setBackground(white);
		numberOfGallonsJTextField.setEditable(true);
		contentPane.add(numberOfGallonsJTextField);
 
		displayButtonGroup = new ButtonGroup();
 
		regularJRadioButton = new JRadioButton();
		regularJRadioButton.setBounds(100, 80, 150, 20);
		regularJRadioButton.setText("Regular         $3.55");
		regularJRadioButton.setSelected(true);
		regularJRadioButton.setForeground(black);
		regularJRadioButton.setBackground(white);
		displayButtonGroup.add(regularJRadioButton);
		contentPane.add(regularJRadioButton);
 
		premiumJRadioButton = new JRadioButton();
		premiumJRadioButton.setBounds(100, 110, 150, 20);
		premiumJRadioButton.setText("Premium      $4.95");
		premiumJRadioButton.setForeground(black);
		premiumJRadioButton.setBackground(white);
		displayButtonGroup.add(premiumJRadioButton);
		contentPane.add(premiumJRadioButton);
 
      superJRadioButton = new JRadioButton();
		superJRadioButton.setBounds(100, 140, 150, 20);
		superJRadioButton.setText("Super            $5.25");
		superJRadioButton.setForeground(black);
		superJRadioButton.setBackground(white);
		displayButtonGroup.add(superJRadioButton);
		contentPane.add(superJRadioButton);
 
		// output
 
		totalJLabel = new JLabel();
		totalJLabel.setBounds(50, 200, 100, 20);
		totalJLabel.setFont(new Font("Default", Font.PLAIN, 12));
		totalJLabel.setText("Total Sale");
		totalJLabel.setForeground(black);
		totalJLabel.setHorizontalAlignment(JLabel.RIGHT);
		contentPane.add(totalJLabel);
 
		totalJTextField = new JTextField();
		totalJTextField.setBounds(210, 200, 50, 20);
		totalJTextField.setFont(new Font("Default", Font.PLAIN, 12));
		totalJTextField.setHorizontalAlignment(JTextField.CENTER);
		totalJTextField.setForeground(black);
		totalJTextField.setBackground(white);
		totalJTextField.setEditable(false);
		contentPane.add(totalJTextField);
 
 
		// control
		enterJButton = new JButton();
		enterJButton.setBounds(50, 300, 80, 20);
		enterJButton.setFont(new Font("Default", Font.PLAIN, 12));
		enterJButton.setText("Enter");
		enterJButton.setForeground(black);
		enterJButton.setBackground(white);
		contentPane.add(enterJButton);
		enterJButton.addActionListener(
 
			new ActionListener()
			{
				public void actionPerformed(ActionEvent event)
				{
					enterJButtonActionPerformed(event);
				}
			}
		);
 
		clearJButton = new JButton();
		clearJButton.setBounds(140, 300, 80, 20);
		clearJButton.setFont(new Font("Default", Font.PLAIN, 12));
		clearJButton.setText("Clear");
		clearJButton.setForeground(black);
		clearJButton.setBackground(white);
		contentPane.add(clearJButton);
		clearJButton.addActionListener(
 
			new ActionListener()
			{
				public void actionPerformed(ActionEvent event)
				{
					clearJButtonActionPerformed(event);
				}
			}
		);
 
		closeJButton = new JButton();
		closeJButton.setBounds(230, 300, 80, 20);
		closeJButton.setFont(new Font("Default", Font.PLAIN, 12));
		closeJButton.setText("Close");
		closeJButton.setForeground(black);
		closeJButton.setBackground(white);
		contentPane.add(closeJButton);
		closeJButton.addActionListener(
 
			new ActionListener()
			{
				public void actionPerformed(ActionEvent event)
				{
					closeJButtonActionPerformed(event);
				}
			}
		);
 
		setTitle("Acme Self Serve");
		setSize( 400, 400 );
		setVisible(true);
   	}
 
   	// main method
   	public static void main(String[] args)
   	{
      		AcmeSelfServe application = new AcmeSelfServe();
      		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   	}
 
   	public void enterJButtonActionPerformed(ActionEvent event)
      {
 
		try
		{
			quantityOfItem = Integer.parseInt(numberOfGallonsJTextField.getText());
			getGasRate();
		}
		catch(NumberFormatException exception)
		 {
		      	JOptionPane.showMessageDialog(this,
		       	"Please enter number of gallons!",
		        "Number Format Error", JOptionPane.ERROR_MESSAGE );
		        numberOfGallonsJTextField.setText("");
		        numberOfGallonsJTextField.requestFocusInWindow();
		}
	}
 
	public void getGasRate()
	{
		if(regularJRadioButton.isSelected())
		{
			double gasRate = 3.55;
		}
 
		if(premiumJRadioButton.isSelected())
		{
			double gasRate = 4.95;
		}
      if(superJRadioButton.isSelected())
      {
         double gasRate = 5.25;
      }
		calculateSubTotal();
	}
 
	public void calculateSubTotal()
	{
		salesAmount = new SalesAmount(saleAmount, quantityOfItem);
		salesSubTotal = salesAmount.getSubTotal();
	}
 
	public void displaySales()
	{
		decimalFormat = new DecimalFormat("$0.00");
      totalJTextField.setText("" + decimalFormat.format(saleAmount));
		totalJTextField.setText("" + salesSubTotal);
	}
 
	public void clearJButtonActionPerformed(ActionEvent event)
	{
		numberOfGallonsJTextField.setText("");
      numberOfGallonsJTextField.requestFocusInWindow();
		totalJTextField.setText("");
		regularJRadioButton.setSelected(true);
	}
 
	public void closeJButtonActionPerformed(ActionEvent event)
	{
		AcmeSelfServe.this.dispose();
	}
}
 
class SalesAmount
{
	int quantityOfItems;
	float salesSubTotal;
   float gasRate;
 
 
 
	public SalesAmount(float saleValue, int quantityValue)
	{
		gasRate = saleValue;
		quantityOfItems = quantityValue;
		salesSubTotal = gasRate * quantityOfItems;
	}
 
	public float getSubTotal()
	{
 
		return salesSubTotal;
	}
}

Any help would be appreciated!

I want the salesSubTotal to be displayed in the totalJTextField.. :/

I can't tell

My window pops up with me being able to select everything, but the textfield does not display the answer. I keep scanning through with no success!

So I added

Public void calculateSubTotal()
	{
		salesAmount = new SalesAmount(saleAmount, quantityOfItem);
		salesSubTotal = salesAmount.getSubTotal();
      displaySales(); // <---- New
	}

Now it displays 0.0 in my JTextField >.< I guess that's a step in the right direction. I have to figure out how to make sure my equation is being sent back properly.

I think it's in my class SalesAmount, float salesSubTotal.

I returned it at the end though, I can't see where the disconnect is >_<

I think I'm gonna take a 15 minute break and come back to it. Maybe I'll be able to spot it when I come back xD

--- Update ---

Are you saying that I might have a zero value that's making my answer be 0.0?

sorry.....

Originally Posted by jocdrew21

*** code removed

You were not putting displaySales() in your try statement, you were not setting your global variables once your radio buttons were selected, you were just creating another variable. Conflicting variables too with floats and double, pick one and stick with it. I tinkered with it for a few minutes and got it working, take a look....

public void calculateSubTotal()
{
	salesAmount = new SalesAmount(gasRate, quantityOfItem); // you were sending in salesAmount here which had no value
	salesSubTotal = salesAmount.getSubTotal();
}

The program need more work but this should get you there.... Your welcome.

How do I set global values? What's the difference between what I did, and making them "Global."

salesAmount has no value but didn't I give it a value by assigning it the subTotal that was returned from my class?

in your getter method you just declared another variable but assigned it a double, and your global variable were a float. If you do something like

private double sales;

This is a global variable because it can be accessed by all of your methods. There in your getter method you need something like

if.foo.isSelected()
regular=3.55;  // this just set the private variable to 3.55

not

if.foo.isSelected()
double regular=3.55; // this just creates another double and never uses it.

Are you using all of your methods? Write some println statements to see what is working and what it is doing.

Consider using inheritance. Your programs dependencies with be easier to understand.

Originally Posted by jocdrew21

in your getter method you just declared another variable but assigned it a double, and your global variable were a float. If you do something like

private double sales;

This is a global variable because it can be accessed by all of your methods.

That is NOT a global variable. Please dont teach people wrong terminology.
This is a private member variable or a "field". You could also call it an "attribute" but definitely not a global.

Yes cornix is correct wrong terminology....