Vending machine

mport java.awt.Color;
import javax.swing.JOptionPane;
import java.text.*;
import java.io.*;
import java.awt.Image;
import javax.swing.ImageIcon;


/**
 *
 * @author student
 */
public class vendingMachine extends javax.swing.JFrame {

    /**
     * Creates new form vendingMachine
     */
    public vendingMachine() {
        initComponents();

    }
    public static double totalMoneyEntered = 0; //Assigning a value of zero to the total money/balance global variable
    //Public array with the stock set to 10 by default for each coin
    public static int[] coinStock = {10, 10, 10, 10, 10}; //Two euro, One Euro, Fifty Cent, Twenty cent, Ten cent
    public static double[] coinValue = {2, 1, 0.5, 0.2, 0.1}; //Two euro, One Euro, Fifty Cent, Twenty cent, Ten cent
    public static double[] productPrice = {1.1, 1.2, 1.3, 1.4};
    public static int[] productStock = {3, 5, 2, 5}; //colastock, diet cola, sprite stock, fanta stock
    DecimalFormat df = new DecimalFormat("#.##"); //Two decimal places object

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")

    private void jButtonTwoEuroActionPerformed(java.awt.event.ActionEvent evt) {
        addCoin(0,0); //Add Two euro
    }

    private void jButtonSpriteActionPerformed(java.awt.event.ActionEvent evt) {
        if (totalMoneyEntered < productPrice[3]) { //Checking if the totalMoneyEntered variable has the a value below 1.3 and calling a method
            insufficient();
        }else{
            if (productStock[2] < 1) { //Checking if a product is in stock
            outOfStock("Sprite");
            jButtonSprite.setEnabled(false);
        } else {
            buying(2,2);
        }
        }
    }

    private void jButtonOneEuroActionPerformed(java.awt.event.ActionEvent evt) {
        addCoin(1,1); //Add One euro
    }

    private void jButtonFiftyCentActionPerformed(java.awt.event.ActionEvent evt) {
        addCoin(2,2); //Add Fity cent
    }

    private void jButtonTwentyCentActionPerformed(java.awt.event.ActionEvent evt) {
         addCoin(3,3); //Add Tenty cent
    }

    private void jButtonCheckStockActionPerformed(java.awt.event.ActionEvent evt) {
        list1.clear(); //Checks the stock of products
        list1.setForeground(Color.white);
        list1.add("Cola in stock: " + productStock[0]);
        list1.add("Diet Cola in stock: " + productStock[1]);
        list1.add("Sprite in stock: " + productStock[2]);
        list1.add("Fanta in stock: " + productStock[3]);
    }

    private void jButtonColaActionPerformed(java.awt.event.ActionEvent evt) {
       if (totalMoneyEntered < productPrice[0]) { //Checking if the totalMoneyEntered variable has the a value below 1.1 and calling a method
            insufficient();
        } else {
            if (productStock[0] < 1) { //Checking if a product is in stock
                outOfStock("Cola");
                jButtonCola.setEnabled(false);
            } else {
                buying(0,0);
            }
        }
    }

    private void formWindowActivated(java.awt.event.WindowEvent evt) {
        this.setResizable(false); //Setting the resizing of the window to false at activation
        stockEnable();
    }

    private void jButtonDietActionPerformed(java.awt.event.ActionEvent evt) {
        if (totalMoneyEntered < productPrice[1]) { //Checking if the totalMoneyEntered variable has the a value below 1.2 and calling a method
            insufficient();
        } else {
            if (productStock[1] < 1) { //Checking if a product is in stock
            outOfStock("Diet Cola");
            jButtonDiet.setEnabled(false);
            }else{
            buying(1,1);
        }
      }
    }

    private void jButtonFantaActionPerformed(java.awt.event.ActionEvent evt) {
        if (totalMoneyEntered < productPrice[3]) { //Checking if the totalMoneyEntered variable has the a value below 1.4 and calling a method
            insufficient();
        }else{
            if (productStock[3] < 1) { //Checking if a product is in stock
            outOfStock("Fanta");
            jButtonFanta.setEnabled(false);
            } else {
           buying(3,3);
        }
      }
    }

    private void jButtonRefilStockActionPerformed(java.awt.event.ActionEvent evt) {
        stockFrame sf = new stockFrame(); //New frame object and setting it to visible button
        sf.setVisible(true);
    }

    private void jButtonTenCentActionPerformed(java.awt.event.ActionEvent evt) {
        addCoin(4,4); //Add Ten cent
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
//Change loop
        int x = 0; //Variables to count the ammount of coins that have been removed from coin stock/An if statement has executed
        int y = 0;
        int z = 0;
        int v = 0;
        int t = 0;
        list1.clear();
        list1.setForeground(Color.green);
        enable();
        while (totalMoneyEntered>0.0){ //checking if totalMoneyEntered has a value above of zero
        if(totalMoneyEntered >= coinValue[0] && coinStock[0]>0){ //Checking if totalMoneyEntered is 2 or above and if a coin is still in stock
            deduct(0,0);
            x++; //counter
        }
        else if(totalMoneyEntered >= coinValue[1] && coinStock[1]>0){ //Checking if totalMoneyEntered is 1 or above and if a coin is still in stock
            deduct(1,1);
            y++; //counter
        }
        else if(totalMoneyEntered >= coinValue[2] && coinStock[2]>0){ //Checking if totalMoneyEntered is 0.5 or above and if a coin is still in stock
            deduct(2,2);
            z++; //counter
        }
        else if(totalMoneyEntered >= coinValue[3] && coinStock[3]>0){ //Checking if totalMoneyEntered is 0.2 or above and if a coin is still in stock
            deduct(3,3);
            v++; //counter
        }
        else if(totalMoneyEntered >= coinValue[4] && coinStock[4]>0){ //Checking if totalMoneyEntered is 0.1 or above and if a coin is still in stock
            deduct(4,4);
            t++; //counter
        }
        }
        //Displaying how many coins have been returned
            list1.add(x + " Two Euro coins returned");
            list1.add(y + " One Euro coins returned");
            list1.add(z + " Fifty cent coins returned");
            list1.add(v + " Twenty cent coins returned");
            list1.add(t + " Ten cent coins returned");

    }



    //methods

    public void insufficient() { //Method for the display of insufficient funds
        list1.clear();
        list1.setForeground(Color.red);
        list1.add("Insufficient funds, your balance is: " + df.format(totalMoneyEntered));
    }
    public void boughtDisplay() { //Method for the display of buying of a product
        list1.clear();
        list1.setForeground(Color.green);
        list1.add("Thanks, your balance is now: " + df.format(totalMoneyEntered));
    }
    public void fundsAddedDipsplay() { //Method for the display of funds added
        list1.clear();
        list1.setForeground(Color.white);
        list1.add("Balance has increased to: " + df.format(totalMoneyEntered));
    }
    public void outOfStock(String product) { //Method for the display of an out of stock product
        list1.clear();
        list1.setForeground(Color.red);
        list1.add("Sorry " + product + " is out of stock");
    }
    public void disabled(){ //Limit method, disabling of buttons

            jButtonTwoEuro.setEnabled(false);
            jButtonOneEuro.setEnabled(false);
            jButtonFiftyCent.setEnabled(false);
            jButtonTwentyCent.setEnabled(false);
            jButtonTenCent.setEnabled(false);
            list1.add("Please choose a product you wish to purchase");
    }
    public void enable(){ //Enabling of buttons method
            jButtonTwoEuro.setEnabled(true);
            jButtonOneEuro.setEnabled(true);
            jButtonFiftyCent.setEnabled(true);
            jButtonTwentyCent.setEnabled(true);
            jButtonTenCent.setEnabled(true);

    }
    public void addCoin(int x, int y){
         if(totalMoneyEntered >= 10.0){ //Checking if totalMoneyEntered variable is above or equal to 10 and calling a disabled method
            disabled();
        }else{
        totalMoneyEntered = totalMoneyEntered + coinValue[x]; //Addition of coin
        fundsAddedDipsplay();
        coinStock[y]++;
        }
    }
    public void deduct(int x, int y){
        totalMoneyEntered = totalMoneyEntered - coinValue[x]; //Deducton of variables
            totalMoneyEntered = Math.round(totalMoneyEntered * 100) / 100.0;
            coinStock[y]--;
    }
    public void buying(int x, int y){
                totalMoneyEntered = totalMoneyEntered - productPrice[x]; //Buying and the deduction of totalMoneyEntered and stock
                totalMoneyEntered = Math.round(totalMoneyEntered * 100) / 100.0;
                productStock[y]--;
                boughtDisplay();
                enable();
    }
    public void stockEnable(){
        if(productStock[0]>0){
            jButtonCola.setEnabled(true);
        }
        if(productStock[1]>0){
            jButtonDiet.setEnabled(true);
        }
        if(productStock[2]>0){
            jButtonSprite.setEnabled(true);
        }
        if(productStock[3]>0){
            jButtonFanta.setEnabled(true);
        }}
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(vendingMachine.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(vendingMachine.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(vendingMachine.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(vendingMachine.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new vendingMachine().setVisible(true);
            }
        });
    }