Enter TextField info into TextBox

Dear experts,

I would like my program to when the user clicks on AddJob the information is deisplayed in a TextBox.

My code so far is:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class JobApplication extends JFrame implements ActionListener
{
  //declaring the variables
  private JTextField Id;
  private  JTextField Customer;
  private  JTextField Paid;
  private  JTextField MaterialCost;
  private  JTextField NumberHourWorked;
  private  JTextField LabourCost;
  private  JTextField RatePerHour;
  private  JTextField TotalPayment;
  private static JobCollection collection = new JobCollection(100);

public JobApplication()
     {
   
              //panels
              JPanel p1 = new JPanel(false);
              JPanel p2 = new JPanel(false);
              p2.setLayout(new GridLayout(10,1));
             JPanel p3 = new JPanel(false);
             p3.setLayout(new GridLayout(10,1));//row/column
             JPanel p4 = new JPanel(false);

              //Place panels on frame
              getContentPane().add(p1, "South");
              getContentPane().add(p2, BorderLayout.CENTER);
              getContentPane().add(p3, BorderLayout.WEST);
              getContentPane().add(p4, "East");
     
     
               //panel P1 to hold the buttons
               JButton AddJob = new JButton("AddJob");
      AddJob.setForeground(Color.blue);
      AddJob.addActionListener(this);
                p1.add(AddJob);
           
                     
             //Panel2 to hold text
             //creating a ID Textfield
       
        Id = new JTextField(10);
        Id.setHorizontalAlignment(JTextField.RIGHT);
        Id.addActionListener(this);
        p2.add(Id);

       //creating a Customer Textfield
       Customer= new JTextField(10);
       Customer.setHorizontalAlignment(JTextField.RIGHT);
       Customer.addActionListener(this);
       p2.add(Customer);

      //creating a Paid Textfield
      Paid= new JTextField(10);
      Paid.addActionListener(this);
      Paid.setHorizontalAlignment(JTextField.RIGHT);
      p2.add(Paid);
         
     //creating a Material Cost Textfield
     MaterialCost= new JTextField(10);
     MaterialCost.setHorizontalAlignment(JTextField.RIGHT);
     MaterialCost.addActionListener(this);
     p2.add(MaterialCost);

     //creating a LabourCost Textfield
     LabourCost= new JTextField(10);
     LabourCost.setHorizontalAlignment(JTextField.RIGHT);
     LabourCost.addActionListener(this);
     p2.add(LabourCost);

     TotalPayment= new JTextField(10);
     TotalPayment.setHorizontalAlignment(JTextField.RIGHT);
     TotalPayment.addActionListener(this);
     p2.add(TotalPayment);

            //Panel p3 to hold labels
           //creating the ID label
           JLabel myLabel;
           myLabel =new JLabel("Input ID", SwingConstants.RIGHT);
           p3.add(myLabel);

          //creating a Customer label
          JLabel myLabel1;
          myLabel1 = new JLabel("Input Customer",SwingConstants.RIGHT);
          p3.add(myLabel1);

         //creating a Paid label
         JLabel myLabel2;
         myLabel2 = new JLabel("Input Paid",SwingConstants.RIGHT);
         p3.add(myLabel2);

         //creating a Material Cost label
         JLabel myLabel3;
         myLabel3 = new JLabel("Input Material Cost",SwingConstants.RIGHT);
         p3.add(myLabel3);
         
          //creating a LabourCost label
         JLabel myLabel6;
         myLabel6 = new JLabel("Input LabourCost",SwingConstants.RIGHT);
          p3.add(myLabel6);

         JLabel myLabel7;
         myLabel7 = new JLabel("Total Payment",SwingConstants.RIGHT);
          p3.add(myLabel7);

               //TextArea created
      JTextArea displayArea;
      displayArea = new JTextArea(15, 11);
      p4.add(displayArea);

              //making the frame
               setTitle("Job Application");
               setBounds(0,0,700,500);
               setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               setVisible(true);

public void actionPerformed(ActionEvent e)
{
      String text1 = Id.getText();
     String text2 = Customer.getText();
      String text = Paid.getText();
 
            
                  try
                  {
                    Double.parseDouble(MaterialCost.getText());
                  }
                       catch (NumberFormatException nfe)
                       {
                                 if(MaterialCost.getText().equals(""))
            {
                 System.out.println("ERROR: Please enter an Material Cost ");
            }
                      else
                      {
                             System.out.println("ERROR: Material cost is not an integer");
                      }
                        }


                try
                {
                               Double.parseDouble(LabourCost.getText());
                 }
            catch (NumberFormatException nfe)
            {
             if(LabourCost.getText().equals(""))
             {
             System.out.println("ERROR: Please enter an Labour Cost ");
             }
                else
             {
             System.out.println("ERROR: Labour Cost is not an integer");
             }
            }


      String actionCommand = e.getActionCommand();
     if(e.getSource() instanceof JButton)
    {
         if("AddJob".equals(actionCommand))
         addFJob();
     }

public  void addFJob()
{

        FixedRateJob job = new  FixedRateJob(Id.getText(), Customer.getText(), Paid.getText(),  Double.parseDouble(MaterialCost.getText()), Double.parseDouble(LabourCost.getText()));
        collection.addFJob(job);
        Id.setText("");
        Customer.setText("");
        Paid.setText("");
        MaterialCost.setText("");
        LabourCost.setText("");

}

At the moment the program clear the text field once the Addbutton has been pressed. I still want to keep inthis function but have the information that has been entered desplayed in the textArea

thank you