title: Java- Reading whether a checkbox is checked or not
body: <p>My program compiles and runs, but here is my problem. I have a checkbox set up for each item, but I only need it to total the items that are checked and not all of the items. Instead its totalling all items regardless of whether or not they are checked.</p>
  
  <pre><code>import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import javax.swing.JButton;
  import javax.swing.JFrame;
  import javax.swing.JLabel;
  import javax.swing.JCheckBox;
  import javax.swing.JPanel;
  import javax.swing.JTextField;
  import java.awt.GridLayout;
  import java.text.*;
  
  public class StudentShopping extends JFrame
  {
      public static void main(String[] args) {
  
          JFrame frame = new JFrame();
  
          frame.setSize(550, 400); //Sets size of the window
          frame.setTitle("Student Shopping");//Adds title to the GUI
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  
          JCheckBox ClothingCheckBox = new JCheckBox();
          JLabel Clothinglbl = new JLabel("Clothing");
          final JTextField ClothingField = new JTextField(3);
          ClothingField.setText("0");
  
          JCheckBox BooksCheckBox = new JCheckBox(); 
          JLabel Bookslbl = new JLabel("Books");
          final JTextField BooksField = new JTextField(3);
          BooksField.setText("0");
  
          JCheckBox SuppliesCheckBox = new JCheckBox();
          JLabel Supplieslbl = new JLabel("Supplies");
          final JTextField SuppliesField = new JTextField(3);
          SuppliesField.setText("0");
  
          JCheckBox MealPlanCheckBox = new JCheckBox();
          JLabel MealPlanlbl = new JLabel("MealPlan");
          final JTextField MealPlanField = new JTextField(3);
          MealPlanField.setText("0");
  
          JCheckBox InternetAccessCheckBox = new JCheckBox();
          JLabel InternetAccesslbl = new JLabel("InternetAccess");
          final JTextField InternetAccessField = new JTextField(3);
          InternetAccessField.setText("0");
  
          final JTextField TotalField = new JTextField(10);
          TotalField.setText("0");
  
  
          JLabel ButtonLabel = new JLabel("Press Button for Total");      
          JButton button  = new JButton("Calculate Total");
  
  
          JPanel panel = new JPanel();
  
          panel.setLayout(new GridLayout(6,3));
          panel.add(ClothingCheckBox);
          panel.add(Clothinglbl);
          panel.add(ClothingField);
          panel.add(BooksCheckBox);
          panel.add(Bookslbl);
          panel.add(BooksField);
          panel.add(SuppliesCheckBox);    
          panel.add(Supplieslbl);
          panel.add(SuppliesField);
          panel.add(MealPlanCheckBox);
          panel.add(MealPlanlbl);
          panel.add(MealPlanField);
          panel.add(InternetAccessCheckBox);
          panel.add(InternetAccesslbl);
          panel.add(InternetAccessField);
          panel.add(ButtonLabel);
          panel.add(button);
          panel.add(TotalField);
          frame.add(panel);
  
          class CalculateListener implements ActionListener {
  
  
              public void actionPerformed(ActionEvent event) {
  
              double Clothing = Double.parseDouble(ClothingField.getText());
              double Books = Double.parseDouble(BooksField.getText()) ;
              double Supplies = Double.parseDouble(SuppliesField.getText());
              double MealPlan = Double.parseDouble(MealPlanField.getText());
              double InternetAccess = Double.parseDouble(InternetAccessField.getText());
              double Total = (Clothing+Books+Supplies+MealPlan+InternetAccess)*100
  
          DecimalFormat df = new DecimalFormat("$#.00");//creates decimal in currency format
          TotalField.setText(df.format(Total)); //
              }
          }
  
          ActionListener listener = new CalculateListener();
          button.addActionListener(listener);                     
  
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setVisible(true);
  
  
          }
   }
  </code></pre>