"should be declared abstract" error message Help !

Question

Dear People,
I have two error messages in my program
"should be declared abstract"
"getAudioClip() not found "
Your advice is appreciated
Norman
"MyMusicApplet_1.java": Error #: 454 : class stan_my_music_applet_1.MyMusicApplet_1 should be declared abstract; it does not define method getStreamKeys() in interface java.applet.AppletContext at line 9
"MyMusicApplet_1.java": Error #: 300 : method getAudioClip(java.lang.String) not found in class stan_my_music_applet_1.MyMusicApplet_1
import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import java.applet.*;
import java.awt.event.*;
public class MyMusicApplet_1 extends JApplet implements ActionListener, AppletContext
     //AppletContext myAppletContext =   new AppletContext();
     //Iterator i =   myAppletContext.getStreamKeys();
     JButton myJButton;
     AudioClip acSound_1 = getAudioClip("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk");
     AudioClip acSound_2 = getAudioClip("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk   ");
     AudioClip acSound_3 = getAudioClip("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk   ");
     AudioClip acSound_4 = getAudioClip("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk   ");
     AudioClip acSound_5 = getAudioClip("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk   ");
     AudioClip acSound_6 = getAudioClip("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk   ");
     AudioClip acSound_7 = getAudioClip("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk   ");
     AudioClip acSound_8 = getAudioClip("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk   ");
     AudioClip acSound_9 = getAudioClip("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk   ");
     JButton myJButtonSound1;
     JButton myJButtonSound2;
     JButton myJButtonSound3;
     JButton myJButtonSound4;
     JButton myJButtonSound5;
     JButton myJButtonSound6;
     JButton myJButtonSound7;
     JButton myJButtonSound8;
     JButton myJButtonSound9;
  public void init()
       Container myContentPane = getContentPane();
       myContentPane.setLayout(new FlowLayout(FlowLayout.RIGHT));
        Dimension buttonSize = new Dimension(190,100);
       Font myFont = new Font("Arial", Font.BOLD,14);
       Border myEdge = BorderFactory.createRaisedBevelBorder();
                //create 1st button's object
                 myJButtonSound1 = new JButton("sound #1");
                myJButtonSound1.addActionListener(this);
               //set the button's border and size, font background and foreground
               myJButtonSound1.setBorder(myEdge);
               myJButtonSound1.setPreferredSize(buttonSize);
               myJButtonSound1.setFont(myFont);
               myJButtonSound1.setBackground(Color.orange);
               myJButtonSound1.setForeground(Color.black);
                //create 2nd button's object
                 myJButtonSound2 = new JButton("sound #2");
                myJButtonSound2.addActionListener(this);
               //set the button's border and size, font, background and foreground
               myJButtonSound2.setBorder(myEdge);
               myJButtonSound2.setPreferredSize(buttonSize);
               myJButtonSound2.setFont(myFont);
               myJButtonSound2.setBackground(Color.blue);
               myJButtonSound2.setForeground(Color.black);
                //create 3rd button's object
                 myJButtonSound3 = new JButton("sound #3");
                myJButtonSound1.addActionListener(this);
               //set the button's border and size, font, background and foreground
               myJButtonSound3.setBorder(myEdge);
               myJButtonSound3.setPreferredSize(buttonSize);
               myJButtonSound3.setFont(myFont);
               myJButtonSound3.setBackground(Color.cyan);
               myJButtonSound3.setForeground(Color.black);
                //create 4th button's object
                 myJButtonSound4 = new JButton("sound #4");
                myJButtonSound4.addActionListener(this);
               //set the button's border and size, font background and foreground
               myJButtonSound4.setBorder(myEdge);
               myJButtonSound4.setPreferredSize(buttonSize);
               myJButtonSound4.setFont(myFont);
               myJButtonSound4.setBackground(Color.pink);
               myJButtonSound4.setForeground(Color.black);
               //create 5th button's object
               myJButtonSound5 = new JButton("sound #5");
              myJButtonSound5.addActionListener(this);
             //set the button's border and size, font background and foreground
             myJButtonSound5.setBorder(myEdge);
             myJButtonSound5.setPreferredSize(buttonSize);
             myJButtonSound5.setFont(myFont);
             myJButtonSound5.setBackground(Color.red);
             myJButtonSound5.setForeground(Color.black);
              //create 6th button's object
               myJButtonSound6 = new JButton("sound #6");
              myJButtonSound6.addActionListener(this);
             //set the button's border and size, font, background and foreground
             myJButtonSound6.setBorder(myEdge);
             myJButtonSound6.setPreferredSize(buttonSize);
             myJButtonSound6.setFont(myFont);
             myJButtonSound6.setBackground(Color.pink);
             myJButtonSound6.setForeground(Color.black);
              //create 7th button's object
               myJButtonSound7 = new JButton("Choice #7");
              myJButtonSound7.addActionListener(this);
             //set the button's border and size, font, background and foreground
             myJButtonSound7.setBorder(myEdge);
             myJButtonSound7.setPreferredSize(buttonSize);
             myJButtonSound7.setFont(myFont);
             myJButtonSound7.setBackground(Color.cyan);
             myJButtonSound7.setForeground(Color.black);
              //create 8th button's object
               myJButtonSound8 = new JButton("Choice #8");
              myJButtonSound8.addActionListener(this);
             //set the button's border and size, font background and foreground
             myJButtonSound8.setBorder(myEdge);
             myJButtonSound8.setPreferredSize(buttonSize);
             myJButtonSound8.setFont(myFont);
             myJButtonSound8.setBackground(Color.yellow);
             myJButtonSound8.setForeground(Color.black);
              //create 9th button's object
               myJButtonSound9 = new JButton("Choice #9");
              myJButtonSound9.addActionListener(this);
             //set the button's border and size, font background and foreground
             myJButtonSound9.setBorder(myEdge);
             myJButtonSound9.setPreferredSize(buttonSize);
             myJButtonSound9.setFont(myFont);
             myJButtonSound9.setBackground(Color.blue);
             myJButtonSound9.setForeground(Color.black);
               //add the buttons to the content pane
               myContentPane.add(myJButtonSound1);
               myContentPane.add(myJButtonSound2);
               myContentPane.add(myJButtonSound3);
               myContentPane.add(myJButtonSound4);
               myContentPane.add(myJButtonSound5);
               myContentPane.add(myJButtonSound6);
               myContentPane.add(myJButtonSound7);
               myContentPane.add(myJButtonSound8);
               myContentPane.add(myJButtonSound9);
      public void actionPerformed(ActionEvent e)
         myJButton = (JButton)e.getSource();
        if(myJButton == myJButtonSound1)
          acSound_1.play();
        if(myJButton == myJButtonSound2)
          acSound_2.play();
        if(myJButton == myJButtonSound3)
          acSound_3.play();
        if(myJButton == myJButtonSound4)
          acSound_4.play();
        if(myJButton == myJButtonSound5)
          acSound_5.play();
         if(myJButton == myJButtonSound6)
           acSound_6.play();
                   if(myJButton == myJButtonSound7)
                     acSound_7.play();
                   if(myJButton == myJButtonSound8)
                     acSound_8.play();
                    if(myJButton == myJButtonSound9)
                      acSound_9.play();
  }

Answer 1

The "should be declared abstract" error message means that you have either extended an abstract class with abstract methods that you have not implemented, or you have implemented an interface and not implemented all of its methods. Non abstract classes have to implement all methods that their base classes or interfaces declare.
The "getAudioClip() not found" error message means that the compiler could not find the method getAudioClip(). Either your class or one of its base classes has to define this method.