Java Container remove method not working correctly

Question

i hava added 1.TextArea 2.TextField then i start adding JButton successively on container...,now by using JRadioButton i want to remove JButton from container using this code

i=0; k=0; while(!birdButton[i].isSelected()){     i++;     }    System.out.println(i); k=i+2; list.removeElementAt(i); listName.removeElementAt(i); System.out.println(k); c.getContentPane().remove(k); 

but when i select the 1st radiobutton 1st JButton should be deleted because of k=i+2; instead of deleting this one it deletes the TextArea(1st one). when i select the 3rd radiobutton then 1st JButton is deleted. can anyone let me know what the problem is? and also System.out.println(i); System.out.println(k); is not printing any value....here is the code

public class RadioDemo implements ActionListener {      String buttonName;     JPanel radioPanel = new JPanel();     ButtonGroup group = new ButtonGroup();     Enumeration enl;     int result;     ActionEvent e;     JRadioButton birdButton[];     int i, k;      Vector<String> listName;     Vector<JComponent> list;     Container c;      public RadioDemo(Vector<String> listName,Vector<JComponent> list,Container c) {          birdButton=new JRadioButton[listName.size()];         this.listName=listName;         this.c=c;         this.list=list;          i = 0;         for (String buttonName : listName){                birdButton[i] = new JRadioButton(buttonName);                birdButton[i].setActionCommand(buttonName);                group.add(birdButton[i]);                birdButton[i].addActionListener(this);                radioPanel.add(birdButton[i]);                i++;          }          birdButton[0].setSelected(true);         radioPanel.setLayout(new BoxLayout          (radioPanel,BoxLayout.Y_AXIS));                                     //birdButton.setBorder          (BorderFactory.createEmptyBorder(5,5,5,5));         result = JOptionPane.showConfirmDialog(null, radioPanel, "Please choose", JOptionPane.OK_CANCEL_OPTION);                         show();     }      /** Listens to the radio buttons. */     public void actionPerformed(ActionEvent e) {         this.e = e;     }      public void show() {         if (result == JOptionPane.OK_OPTION) {             i = 0;             k = 0;             while (!birdButton[i].isSelected()) {                 i++;              }             System.out.println(i);             k = i + 2;             list.removeElementAt(i);             listName.removeElementAt(i);             System.out.println(k);             c.getContentPane().remove(k);             c.getContentPane().validate();              // System.out.println(e.getActionCommand());             // c.getContentPane().rePaint();         }     }  } 

Answer 1

The Container returned by getContentPane() is, by default, the contentPane of a JRootPane managed by the top-level container, JFrame. Although, "as a convenience, the add method and its variants, remove and setLayout have been overridden to forward to the contentPane as necessary," there's no a priori way to know about the frame's internal use of component indices.

Instead, add on your own JComponent to the frame and operate on it; JPanel is a common choice.

Addendum: Also consider an alternative layout such as CardLayout, illustrated here.