title: Renaming a button after clicking - Java JButton
body: <p>I'm trying to change my button from saying "Start" to "Stop" when I click on it. My attempt at doing this is below, I looked it up and tried to copy the guides but I don't see what I'm doing wrong. I might be missing some "}" because I left out a lot of the code that's irrelevant. Can someone see what I'm doing wrong?  </p>
  
  <pre><code>import java.awt.*;
  import java.awt.event.*;
  import javax.swing.*;
  import javax.swing.event.*;
  
  public class PipeGameApp extends JFrame implements ActionListener {
  
      private static int BOARD_SIZE = 11;
      private PipeGame game;      // The model
      private PipeGameView view;      // The view
  
      // This constructor builds the window
      public PipeGameApp(String title) {
          super(title);
  
          game = new PipeGame(BOARD_SIZE);
          view = new PipeGameView(game);
  
          //THE TOP BAR
          JPanel topBar = new JPanel();
          JButton startButton = new JButton("Start");
          startButton.addActionListener(this);
  
  
  
          ButtonGroup bg1 = new ButtonGroup();
          JRadioButton rb1 = new JRadioButton("2 minutes", true);
          rb1.addActionListener(this);
  
  
          JRadioButton rb2 = new JRadioButton("10 minutes", false);
          JRadioButton rb3 = new JRadioButton("No Time Limit", false);
          bg1.add(rb1);
          bg1.add(rb2);
          bg1.add(rb3);
  
  
  
  
  
          topBar.add(startButton);
          topBar.add(rb1);
          topBar.add(rb2);
          topBar.add(rb3);
          //END OF TOP BAR
  
          //THE BOTTOM BAR
          JPanel bottomBar = new JPanel();
          JLabel timeLeft = new JLabel("Time Left: ");
          JProgressBar bar = new JProgressBar();
          bottomBar.add(timeLeft);
          bottomBar.add(bar);
          bottomBar.setVisible(false);
          //end of bottom
  
          /*
           //bottom 2
           int fscore=10;
           JPanel bottomBar2 = new JPanel();
           JLabel score = new JLabel("Final score:" + fscore);
           bottomBar2.add(score);
           bottomBar2.setVisible(false);
           */
  
  
          getContentPane().add(view); //CHANGE LOCATION OF BOARD GAME HERE BorderLayout.SOUTH
  
          getContentPane().add(topBar, BorderLayout.NORTH);
          getContentPane().add(bottomBar, BorderLayout.SOUTH);
  
          //getContentPane().add(bottomBar2, BorderLayout.SOUTH);
  
  
  
          // Add the listeners to the view's buttons
          for (int r = 0; r &lt; BOARD_SIZE; r++) {
              for (int c = 0; c &lt; BOARD_SIZE; c++) {
                  view.getButton(r, c).addActionListener(new ActionListener() {
                      public void actionPerformed(ActionEvent e) {
                          handleTileSelection(e);
                      }
                  });
              }
          }
  
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          //setSize(446,466);
          setSize(446, 530);
          setResizable(false);
      }
  
      // Handle a Tile Selection.   Just change the model and update the view.
      private void handleTileSelection(ActionEvent e) {
          // Find the row and column of the pressed button, then make the change
          int r = 0, c = 0;
          for (int i = 0; i &lt; BOARD_SIZE; i++) {
              for (int j = 0; j &lt; BOARD_SIZE; j++) {
                  if (e.getSource() == view.getButton(i, j)) {
                      if (game.placePipe(i, j)) {
                          view.update();
                      }
                      return;
                  }
              }
          }
      }
  
      // This is where it all begins
      public static void main(String[] args) {
          new PipeGameApp("The Frantic Pipe Layer").setVisible(true);
      }
  
      @Override
      public void actionPerformed(ActionEvent ae) {
          startButton.setText("asdf");
      }
  }
  </code></pre>