So I am trying to get these radio buttons to respond to input but I have searched the internet and can find no code examples to show me how to do this. I also want to get the spinners to function in conjunction with them so when a product is selected the user can scroll to the number of units they want. then I have to tie each one into the calculate the sale button. I am pulling my hair out all over the internet watching videos etc. If anyone knows good tutorials on this specific stuff , I appreciate it . here is my current code.

public class Sales extends javax.swing.JFrame {


    public Sales() {
        initComponents();
    }



    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        buttonGroup1 = new javax.swing.ButtonGroup();
        jFrame1 = new javax.swing.JFrame();
        jFrame2 = new javax.swing.JFrame();
        jTextField1 = new javax.swing.JTextField();
        jRadioButton1 = new javax.swing.JRadioButton();
        jRadioButton2 = new javax.swing.JRadioButton();
        jRadioButton3 = new javax.swing.JRadioButton();
        jRadioButton4 = new javax.swing.JRadioButton();
        jRadioButton5 = new javax.swing.JRadioButton();
        jTextField2 = new javax.swing.JTextField();
        jTextField3 = new javax.swing.JTextField();
        jTextField4 = new javax.swing.JTextField();
        jTextField5 = new javax.swing.JTextField();
        jTextField6 = new javax.swing.JTextField();
        jSpinner1 = new javax.swing.JSpinner();
        jTextField7 = new javax.swing.JTextField();
        jTextField8 = new javax.swing.JTextField();
        jSpinner2 = new javax.swing.JSpinner();
        jTextField9 = new javax.swing.JTextField();
        jSpinner3 = new javax.swing.JSpinner();
        jSpinner4 = new javax.swing.JSpinner();
        jTextField10 = new javax.swing.JTextField();
        jTextField11 = new javax.swing.JTextField();
        jSpinner5 = new javax.swing.JSpinner();
        jButton1 = new javax.swing.JButton();

        javax.swing.GroupLayout jFrame1Layout = new javax.swing.GroupLayout(jFrame1.getContentPane());
        jFrame1.getContentPane().setLayout(jFrame1Layout);
        jFrame1Layout.setHorizontalGroup(
            jFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        jFrame1Layout.setVerticalGroup(
            jFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );

        javax.swing.GroupLayout jFrame2Layout = new javax.swing.GroupLayout(jFrame2.getContentPane());
        jFrame2.getContentPane().setLayout(jFrame2Layout);
        jFrame2Layout.setHorizontalGroup(
            jFrame2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        jFrame2Layout.setVerticalGroup(
            jFrame2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("sales");

        jTextField1.setEditable(false);
        jTextField1.setText("Please select a product and number of units.");
        jTextField1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField1ActionPerformed(evt);
            }
        });

        jRadioButton1.setText("Product one");
        jRadioButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jRadioButton1ActionPerformed(evt);
            }
        });

        jRadioButton2.setText("Product Two");

        jRadioButton3.setText("Product Three");

        jRadioButton4.setText("Product four");

        jRadioButton5.setText("Product five");

        jTextField2.setEditable(false);
        jTextField2.setText(" $2.98 ");
        jTextField2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField2ActionPerformed(evt);
            }
        });

        jTextField3.setEditable(false);
        jTextField3.setText(" $4.50");

        jTextField4.setEditable(false);
        jTextField4.setText(" $9.98");

        jTextField5.setEditable(false);
        jTextField5.setText("  $4.49");

        jTextField6.setEditable(false);
        jTextField6.setText(" $6.87");

        jSpinner1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jSpinner1MouseClicked(evt);
            }
        });

        jTextField7.setEditable(false);
        jTextField7.setText("number of units");
        jTextField7.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField7ActionPerformed(evt);
            }
        });

        jTextField8.setEditable(false);
        jTextField8.setText("number of units");

        jSpinner2.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jSpinner2MouseClicked(evt);
            }
        });

        jTextField9.setEditable(false);
        jTextField9.setText("number of units");

        jSpinner3.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jSpinner3MouseClicked(evt);
            }
        });

        jSpinner4.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jSpinner4MouseClicked(evt);
            }
        });

        jTextField10.setEditable(false);
        jTextField10.setText("number of units");

        jTextField11.setEditable(false);
        jTextField11.setText("number of units");

        jSpinner5.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jSpinner5MouseClicked(evt);
            }
        });

        jButton1.setText("Calculate Sale");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jTextField1)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jRadioButton5)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(jTextField6))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jRadioButton4)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(jTextField5))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jRadioButton3)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(jTextField4))
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jRadioButton2)
                            .addComponent(jRadioButton1))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jTextField2)
                            .addComponent(jTextField3))))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jTextField10)
                    .addComponent(jTextField8)
                    .addComponent(jTextField9)
                    .addComponent(jTextField11)
                    .addComponent(jTextField7))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addComponent(jSpinner1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addComponent(jSpinner2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addComponent(jSpinner3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addComponent(jSpinner4, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addGap(10, 10, 10))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jSpinner5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addContainerGap())))
            .addGroup(layout.createSequentialGroup()
                .addGap(37, 37, 37)
                .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 332, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(43, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(20, 20, 20)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jRadioButton1)
                    .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jSpinner1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jTextField7, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jRadioButton2)
                    .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jTextField8, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jSpinner2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jRadioButton3)
                    .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jTextField9, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jSpinner3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jRadioButton4)
                    .addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jSpinner4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jTextField10, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jRadioButton5)
                    .addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jTextField11, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jSpinner5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, 36, Short.MAX_VALUE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

    private void jTextField2ActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // TODO add your handling code here:
    }                                           

    private void jTextField7ActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // TODO add your handling code here:
    }                                           

    private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // TODO add your handling code here:
    }                                           

    private void jSpinner2MouseClicked(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
    }                                      

    private void jSpinner3MouseClicked(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
    }                                      

    private void jSpinner4MouseClicked(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
    }                                      

    private void jSpinner5MouseClicked(java.awt.event.MouseEvent evt) {                                       
        // TODO add your handling code here:
    }                                      

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
    }                                        

    private void jRadioButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                              
        // TODO add your handling code here:
    }                                             

    private void jSpinner1MouseClicked(java.awt.event.MouseEvent evt) {                                       
        // TODO dd your handling code here:
    }                                      

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {

       double product1 =0;
       double product2 =0;
       double product3 =0;
       double product4 =0;
       double product5 =0;
       double quantity1 =0;
       double quantity2 =0;
       double quantity3 =0;
       double quantity4 =0;
       double quantity5 =0;

       String unitString;

       int lineAmount =1;
       int orderAmount =0;



        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(Sales.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Sales.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Sales.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Sales.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 Sales().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.ButtonGroup buttonGroup1;
    private javax.swing.JButton jButton1;
    private javax.swing.JFrame jFrame1;
    private javax.swing.JFrame jFrame2;
    private javax.swing.JRadioButton jRadioButton1;
    private javax.swing.JRadioButton jRadioButton2;
    private javax.swing.JRadioButton jRadioButton3;
    private javax.swing.JRadioButton jRadioButton4;
    private javax.swing.JRadioButton jRadioButton5;
    private javax.swing.JSpinner jSpinner1;
    private javax.swing.JSpinner jSpinner2;
    private javax.swing.JSpinner jSpinner3;
    private javax.swing.JSpinner jSpinner4;
    private javax.swing.JSpinner jSpinner5;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField10;
    private javax.swing.JTextField jTextField11;
    private javax.swing.JTextField jTextField2;
    private javax.swing.JTextField jTextField3;
    private javax.swing.JTextField jTextField4;
    private javax.swing.JTextField jTextField5;
    private javax.swing.JTextField jTextField6;
    private javax.swing.JTextField jTextField7;
    private javax.swing.JTextField jTextField8;
    private javax.swing.JTextField jTextField9;
    // End of variables declaration                   
}

Lines 259-297 contain empty methods that will be called when the user clicks etc on the corresponding controls. All you need to do is to put your code into those methods. Start by just putting a simple System.out.println, so you can confirm that the method is being called when you expect it. Then put in the code that you want to be executed.

ok so what I cant figure out is what code I need to use for the spinners. I need to take the spinner and multiply the number of mouseclicks times the product price. then I need to calculate the total how do I take spinners mouse clicks and change them into numbers I can multiply times the product price in my code. also how do I limit the numbers on the spinners to 1-10 with no negative numbers. If you know a good website I have been reading the java site but it is very limited on this.

A couple more tips re JSpinner
1. Don't use a mouselistener, use a ChangeListener which will be called each time the spinner's value is changed. In that you can use getValue() to find the spinners latest value
2. To set a numeric range, eg 1-10, use a SpinnerNumberModel. Create a new SpinnerNumberModel with appropraiate parameters, and pass that to the spinner's constructor. You;ll find the details (as always) the Java API documentation
http://docs.oracle.com/javase/7/docs/api/

great thanks I went ahead and made and made a much easier code I seem to be getting one error that I am not sure why if I can fix it I can get this program to run and at least have a functioning product program while I play with the other one. here is the code. the error is on line 18 and the error is unreachable statement which usually means I left out a { somewhere but I cant find the dang thing . Anyone see this right off.

import javax.swing.JOptionPane;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author kyle
 */
public class objectsale extends javax.swing.JFrame {

    private static void checkNum()
    {
        throw new UnsupportedOperationException();

      double product1; //to hold the product numbers
      double product2 =0;
      double product3 =0;
      double product4 =0;
      double product5 =0;
      double quantity1=0; //to hold the quantity totals
      double quantity2=0;
      double quantity3=0;
      double quantity4=0;
      double quantity5=0;
      String unitString;
      int lnAmt=1;//to hold the line amount
      int ordAmt=0; // to hold the order amount
              while(lnAmt != -1)
      {
          unitString = JOptionPane.showInputDialog("Enter product number(1-5)-1 to quit:");
          lnAmt=Integer.parseInt(unitString);

          if (lnAmt >=1 && lnAmt<=5)
          {
      unitString = JOptionPane.showInputDialog("Enter quantity");
      int num = Integer.parseInt(unitString);
      switch(lnAmt)
      {
          case 1:
              product1 = num * 2.98;
              break;

          case 2:
              product2 = num * 4.50;
              break;

          case 3:
              product3 = num * 9.98;
              break;

          case 4:
              product4 = num * 4.49;
              break;

          case 5:
              product5 = num * 6.87;
              break;

      }
      }//To change body of generated methods, choose Tools | Templates.
        if(lnAmt>=1&&lnAmt<=5)
      {   
    }
      }
    }
    /**
     * Creates new form objectsale
     */
    public objectsale() {
        initComponents();
    }

    /**
     * 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")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        product1 = new javax.swing.JLabel();
        product2 = new javax.swing.JLabel();
        product3 = new javax.swing.JLabel();
        product4 = new javax.swing.JLabel();
        product5 = new javax.swing.JLabel();
        purchase = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("sales");

        product1.setBackground(new java.awt.Color(102, 255, 255));
        product1.setText("PRODUCT 1 PRICE PER UNIT $2.98");

        product2.setBackground(new java.awt.Color(51, 255, 255));
        product2.setText("PRODUCT 2 PRICE PER UNIT $4.50");

        product3.setBackground(new java.awt.Color(153, 255, 255));
        product3.setText("PRODUCT 3 PRICE PER UNIT $9.98");

        product4.setText("PRODUCT 4 PRICE PER UNIT $4.49");

        product5.setBackground(new java.awt.Color(153, 255, 255));
        product5.setText("PRODUCT 5 PRICE PER UNIT $6.87");

        purchase.setFont(new java.awt.Font("Tahoma", 1, 10)); // NOI18N
        purchase.setText("CLICK TO PURCHASE");
        purchase.setActionCommand("PLEASE CLICK ");
        purchase.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                purchaseActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                    .addComponent(product5, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 202, Short.MAX_VALUE)
                    .addComponent(product4, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(product3, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(product2, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(product1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(purchase, javax.swing.GroupLayout.DEFAULT_SIZE, 184, Short.MAX_VALUE)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(product1, javax.swing.GroupLayout.PREFERRED_SIZE, 36, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(product2, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(8, 8, 8)
                .addComponent(product3, javax.swing.GroupLayout.PREFERRED_SIZE, 38, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(product4, javax.swing.GroupLayout.PREFERRED_SIZE, 44, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(product5, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(0, 0, Short.MAX_VALUE))
            .addGroup(layout.createSequentialGroup()
                .addComponent(purchase, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

    private void purchaseActionPerformed(java.awt.event.ActionEvent evt) {                                         
      checkNum();  // TODO add your handling code here:
    }                                        

    /**
     * @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(objectsale.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(objectsale.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(objectsale.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(objectsale.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

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

      }
      }


    // Variables declaration - do not modify                     
    private javax.swing.JLabel product1;
    private javax.swing.JLabel product2;
    private javax.swing.JLabel product3;
    private javax.swing.JLabel product4;
    private javax.swing.JLabel product5;
    private javax.swing.JButton purchase;
    // End of variables declaration                   
}

Line 16 throws an exception, so control will immediately exit the checkNum method and the exception will be passed up to wherever checkNum was called from.
Therefore, none of the statements following line 16 can ever be executed.

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