多个JButton，点击它时需要更改按钮的文本

Question

问题是，我有26个JButton组件，我必须从中随机选择8个组件并将它们放在两个JPanel组件中的2 x 2网格中。单击一个按钮时，我需要用从原件26中选择的另一个随机按钮替换它。我无法弄清楚如何更换用另一个随机按钮单击的按钮。到目前为止我所拥有的确实有效，但可能不是最好的方法（我显然是一个菜鸟）。

有人能为我提供一些见解或至少引导我走向正确的方向吗？

import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JVowelConsonant extends JFrame implements ActionListener
{
   int x = 0;
   String[] letter = {"a", "e", "i", "o", "u", "b", "c", "d", "f", "g", "h", "j", "k", "l", "m", "n", "p", "q", "r", "s", "t", "v", "w", "x", "y", "z"};
   JPanel panel1 = new JPanel(new GridLayout(2, 2));
   JPanel panel2 = new JPanel(new GridLayout(2, 2));
   JPanel panel3 = new JPanel(new FlowLayout());
   JLabel label = new JLabel("");
   JButton[] buttons = new JButton[26];

   public JVowelConsonant()
   {
      super("Vowel or Consonant?");   
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      for(x = 0; x < buttons.length; ++x)
      {
         buttons[x] = new JButton(letter[x]);
         buttons[x].addActionListener(this);
      }   
      setLayout(new FlowLayout());
      add(panel1, FlowLayout.LEFT);
      add(panel2, FlowLayout.CENTER);
      add(panel3, FlowLayout.RIGHT);   

      ArrayList<Integer> list = new ArrayList<Integer>();
      for(int y = 0; y < 26; ++y)
      {
         list.add(new Integer(y));
      }
      Collections.shuffle(list);
      for(int y = 0; y <= 3; ++y)
      {
         panel1.add(buttons[list.get(y)]);
      }               
      for(int y = 4; y <= 7; ++y)
      {
         panel2.add(buttons[list.get(y)]);
      }       
      panel3.add(label);      
      setSize(500, 500);
   }

   public void actionPerformed(ActionEvent e)
   {
      Object source = e.getSource();
      if(source == buttons[0] || source == buttons[1] || source == buttons[2] || source == buttons[3] || source == buttons[4])
      {
         String type = "Vowel";
         label.setText(type);              
      }
      else
      {
         String type = "Consonant";
         label.setText(type);
      }   
   }

   public static void main(String[] args)
   {
      JVowelConsonant frame = new JVowelConsonant();
      frame.setVisible(true);
   }
}