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Java GUI help !!

In my following program, how do I have numbers entered into the TextArea that when I click the JButton the numbers add up and are displayed in the TextField above the JButton ???


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  1.  
  2.  
  3.  import java.awt.*; 
  4.  import java.awt.event.*; 
  5.  import javax.swing.*; 
  6.  
  7.  public class Main extends JFrame 
  8.  { 
  9.  
  10.      private JTextField jTextField1; 
  11.      private JTextArea jTextArea1; 
  12.      private JScrollPane jScrollPane1; 
  13.      private JButton jButton1; 
  14.      private JPanel contentPane; 
  15.  
  16.  
  17.  
  18.      public Main() 
  19.      { 
  20.          super(); 
  21.          initializeComponent(); 
  22.  
  23.          this.setVisible(true); 
  24.      } 
  25.  
  26.  
  27.      private void initializeComponent() 
  28.      { 
  29.          jTextField1 = new JTextField(); 
  30.          jTextArea1 = new JTextArea(); 
  31.          jScrollPane1 = new JScrollPane(); 
  32.          jButton1 = new JButton(); 
  33.          contentPane = (JPanel)this.getContentPane(); 
  34.  
  35.  
  36.          jTextField1.addActionListener(new ActionListener() { 
  37.              public void actionPerformed(ActionEvent e) 
  38.              { 
  39.                  jTextField1_actionPerformed(e); 
  40.              } 
  41.  
  42.          }); 
  43.  
  44.          jScrollPane1.setViewportView(jTextArea1); 
  45.  
  46.          jButton1.setText("obtain the sum"); 
  47.          jButton1.addActionListener(new ActionListener() { 
  48.              public void actionPerformed(ActionEvent e) 
  49.              { 
  50.                  jButton1_actionPerformed(e); 
  51.              } 
  52.  
  53.          }); 
  54.  
  55.          contentPane.setLayout(null); 
  56.          addComponent(contentPane, jTextField1, 310,59,225,45); 
  57.          addComponent(contentPane, jScrollPane1, 17,26,266,298); 
  58.          addComponent(contentPane, jButton1, 340,225,156,31); 
  59.  
  60.          this.setTitle("Main - extends JFrame"); 
  61.          this.setLocation(new Point(0, 0)); 
  62.          this.setSize(new Dimension(573, 440)); 
  63.      } 
  64.  
  65.  
  66.      private void addComponent(Container container,Component c,int x,int y,int width,int height) 
  67.      { 
  68.          c.setBounds(x,y,width,height); 
  69.          container.add(c); 
  70.      } 
  71.  
  72.  
  73.      private void jTextField1_actionPerformed(ActionEvent e) 
  74.      { 
  75.          System.out.println("\njTextField1_actionPerformed(ActionEvent e) called."); 
  76.  
  77.  
  78.      } 
  79.  
  80.      private void jButton1_actionPerformed(ActionEvent e) 
  81.      { 
  82.          System.out.println("\njButton1_actionPerformed(ActionEvent e) called."); 
  83.  
  84.  
  85.      }
  86.  
  87.  
  88.  
May 4 '10 #1
1 2174
jkmyoung
2,057 Expert 2GB
Divide the problem into steps.
1. Capture the button press event.
2. Get the input.
3. Process the input.
3b. Convert the input into integers from string.
4. Display the output.

Which of these steps are you specifically having trouble with?
May 4 '10 #2

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