Thread: Java program using two classes

hi,
im new to java and to this site so it's good to meet u all
ok now with my problem, the problem is that i need to set u a add coin system which seems simple but my problem is i have to do it using 2 classes a money class which has the code and then a gui with the buton and a text box on but i dont know what to put on the gui side i think ive got the money class done
any help with this problem would be great cos ive had this problem now for a couple of days

this is my money class

public class Credit {
 
	private float credit;
 
	public Credit(){
		credit = 0;
		}
 
	public float addCredit(){
 
		credit = + 10;
 
		return credit;
 
	}
}

hi yeah thanks for the help but i still dont really understand it do u an example more like im trying to do if it helps here is the GUI i have at the moment

import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
 
import javax.swing.*;
 
 
public class VendingMachineGUI extends JFrame  implements ActionListener{
 
	private JTextArea displayArea;
	private JTextField CoinTextField;
	private JButton CoinButton, saveButton, displayAllItemsButton, findItemButton, updateButton, PurchaseButton;
	private ArrayList <Dispenser> listRecords;
	private int counter;
	private Credit c;
 
	private Dispenser vendingitems[];
 
	public static void main(String[] args)
	{
		new VendingMachineGUI();
	}
 
	public VendingMachineGUI(){
 
		setLayout(new FlowLayout());
 
		CoinTextField = new JTextField(20);
 
		CoinButton = new JButton("Add Coin");
		CoinButton.setForeground(Color.blue);
 
		saveButton = new JButton("Save Item");
		saveButton.setForeground(Color.red);
		displayAllItemsButton = new JButton("Display All Items!");
		displayAllItemsButton.setForeground(Color.blue);
		findItemButton = new JButton("Find Item ?");
		updateButton = new JButton("Update List");
		updateButton.setForeground(Color.blue);
 
		displayArea = new JTextArea();
		displayArea.setPreferredSize(new Dimension(400, 200));
		displayArea.setBackground(Color.lightGray);
 
		PurchaseButton = new JButton("Purchase Items!");
		PurchaseButton.setForeground(Color.blue);
 
		c = new Credit();
 
		add(CoinButton); add(CoinTextField); add(saveButton); add(displayAllItemsButton); add(displayArea);
		add(findItemButton); add(updateButton); add(PurchaseButton);
		saveButton.addActionListener(this); displayAllItemsButton.addActionListener(this);
		findItemButton.addActionListener(this);
		updateButton.addActionListener(this);
 
		displayAllItemsButton.setEnabled(false);
		findItemButton.setEnabled(false);
		updateButton.setEnabled(false);
 
		setTitle("*** Vending Machine ****");
		setSize(450, 500);
		setVisible(true);
 
		CoinTextField.setText("0.0");
		vendingitems = new Dispenser[8];
 
		counter =0;
 
	}
 
	public void actionPerformed(ActionEvent event){
		if (event.getSource()==CoinButton){
 
			float totalCredit = c.addCredit();}
			CoinTextField.setText(Float.toString(totalCredit ));
}
}

sos i forgot to post my dispenser class, i havnt added this to the gui yet so i think u can take the gui as all wrong idealy i just need the add coin thing working and then i can build the dispenser in

import javax.swing.JOptionPane;
 
 
public class Dispencer {
 
	private String itemID;
	private String itemName; 
    private int itemPrice;  
    private int itemQuantity;
    boolean items;
 
    public Dispencer(String id, String in, int ip, int iq)
    {
    	itemID = id;
    	itemName = in;
        itemPrice  = ip;
        itemQuantity = iq;
    }
 
    public String getItemID()
    {
    	return(itemID);
    }
 
    public String getItemName()
    {
    	return(itemName);
    }
 
    public int getItemPrice()
    {
    	return(itemPrice);
    }
 
    public int getItemQuantity()
    {
    	return(itemQuantity);
    }
 
    public void replaceItemQuantity(int iq)
    {
        itemQuantity = iq;
	}
 
    public void replaceItemPrice(int ip)
    {
        itemPrice  = ip;
    }
 
    public String getItemValues()
    {
    	if (!itemID.equals(""))
    		return "Item ID: " + itemID + "Item Name: " + itemName + "  Price: " + itemPrice + " Quantity:" + itemQuantity + "\n";
    	else
    		return("");
    }
 
    public boolean itemsLeft(){
 
 
		if ((itemQuantity <1))
			items = false;
		else
			items = true;
 
		return (items);	
	}
 
    public void dispenceItem()
    {
		if (itemQuantity >0)
			itemQuantity = itemQuantity - 1;
		else
		{
			JOptionPane.showMessageDialog(null, "No items left");
		} 
	}
 
 
}

well ideally id like it to vend items so select items store them in the panal with an over all amount at the side and then click a purchase button which displays items have vended and your chage is if there is any but i think i know how to solve that, im just stuck at the easy part which is were i always get stuck at, so idealy could u help me with the add coins stuff