built with bottom buttons

assignments/a2/src/main/java/Controls.java

@@ -3,6 +3,7 @@ import java.util.*;
 import java.awt.*;
 import javax.swing.*;
 import javax.swing.event.*;
+import java.awt.event.*;
 
 public class Controls extends JPanel implements Observer
 {
@@ -23,7 +24,7 @@ public class Controls extends JPanel implements Observer
     this.setPreferredSize(new Dimension(1280,75));
     this.setMinimumSize(new Dimension(320, 75));
     this.play = new JButton("Play");
-    changeButton.addActionListener(new ActionListener()
+    play.addActionListener(new ActionListener()
     {
       public void actionPerformed(ActionEvent e)
       {
@@ -31,7 +32,7 @@ public class Controls extends JPanel implements Observer
       }
     });
     this.rewind = new JButton("Rewind");
-    changeButton.addActionListener(new ActionListener()
+    rewind.addActionListener(new ActionListener()
     {
       public void actionPerformed(ActionEvent e)
       {
@@ -51,15 +52,15 @@ public class Controls extends JPanel implements Observer
     });
     this.playback.setPreferredSize(new Dimension(280, 75));
     this.reset = new JButton("End");
-    changeButton.addActionListener(new ActionListener()
+    reset.addActionListener(new ActionListener()
     {
       public void actionPerformed(ActionEvent e)
       {
-        playback.setValue(playback.getMaximum()));
+        playback.setValue(playback.getMaximum());
       }
     });
     this.clear = new JButton("Start");
-    changeButton.addActionListener(new ActionListener()
+    clear.addActionListener(new ActionListener()
     {
       public void actionPerformed(ActionEvent e)
       {