Hi vasudev
Do not use Public keyword with the inner classes.
Cheers
Girish
> -----Original Message-----
> From: RVASUDEV [SMTP:[EMAIL PROTECTED]]
> Sent: Tuesday, October 26, 1999 6:50 PM
> To: [EMAIL PROTECTED]
> Subject: Partly off-topic: Q on inner classes/ActionListener
>
> Hi
>
> [Platform: Win NT 4.0 SP3, Sun JDK 1.2.2]
>
> While compiling a java application, I get some
> errors. App and err details below. Any suggestions
> appreciated. [The program is a simple one to
> encode/decode a file, the encode/decode logic
> hasn't been added yet]
>
> TIA
> Vasudev
>
> The application :
>
> -------------------------------------------------
> // Codec1.java
>
> import java.awt.*;
> import java.awt.event.*;
> import java.io.*;
>
> public class Codec1 extends Frame {
>
> /** initialize fields */
> Label inFileLabel = new Label("Input file name");
> TextField inFileName = new TextField(64);
> Label outFileLabel = new Label("Output file name");
> TextField outFileName = new TextField(64);
> Button encodeBtn = new Button("Encode");
> Button decodeBtn = new Button("Decode");
> Button exitBtn = new Button("Exit");
> TextField status = new TextField(64);
> FileInputStream fis;
> BufferedInputStream bis;
> DataInputStream dis;
> FileOutputStream fos;
> BufferedOutputStream bos;
> DataOutputStream dos;
>
> /** main - just creates a new Codec1 object */
> public static void main(String[] args) {
> new Codec1();
> }
>
> /* no-arg constructor */
> public Codec1() {
>
> super("Codec1");
>
> // setup GUI
> setLayout(new FlowLayout());
> add(inFileLabel);
> add(inFileName);
> add(outFileLabel);
> add(outFileName);
> add(encodeBtn);
> add(decodeBtn);
> add(exitBtn);
> add(status);
>
> // add listeners
> encodeBtn.addActionListener(new EncBtnAL());
> decodeBtn.addActionListener(new DecBtnAL());
> exitBtn.addActionListener(new ExiBtnAL());
>
> enableButtons();
> this.setSize(400, 500);
> this.setVisible(true);
> this.show();
>
> }
>
> /** listener for Encode Button */
> public class EncBtnAL implements ActionListener {
> public void ActionPerformed(ActionEvent ae) {
> disableButtons();
> status.setText("Encoding...please wait");
> encode( inFileName.getText().trim(),
> outFileName.getText().trim() );
> enableButtons();
> }
> }
>
> /** listener for Decode Button */
> public class DecBtnAL implements ActionListener {
> public void ActionPerformed(ActionEvent ae) {
> //disableButtons();
> status.setText("Not implemented yet");
> // decode(inFileName.getText(),
> //outFileName.getText());
> //enableButtons();
> }
> }
>
> /** listener for Encode Button */
> public class ExiBtnAL implements ActionListener {
> public void actionPerformed(ActionEvent ae) {
> System.out.println("Exiting...");
> sleep(1);
> System.exit(0);
> }
> }
>
> public void encode(String inFileName, String outFileName) {
> try {
> fis = new FileInputStream(inFileName);
> bis = new BufferedInputStream(fis);
> dis = new DataInputStream(bis);
> fos = new FileOutputStream(outFileName);
> bos = new BufferedOutputStream(fos);
> dos = new DataOutputStream(bos);
> char c;
> while ((c = dis.readChar()) != -1) {
> //c = c ^ c;
> dos.writeChar((int) c);
> }
> status.setText("Encoding complete");
> sleep(1);
> }
> catch(IOException ioe) {
> System.out.println("IO error: " + ioe);
> status.setText("Encode failed");
> sleep(1);
> }
> finally {
> try {
> dis.close(); bis.close(); fis.close();
> dos.close(); bos.close(); fos.close();
> }
> catch(IOException ioe) {
> System.out.println("IO error: " + ioe);
> status.setText("Close(s) failed");
> sleep(1);
> }
> }
> }
>
> public void disableButtons() {
> encodeBtn.setEnabled(false);
> decodeBtn.setEnabled(false);
> exitBtn.setEnabled(false);
> }
>
> public void enableButtons() {
> encodeBtn.setEnabled(true);
> decodeBtn.setEnabled(true);
> exitBtn.setEnabled(true);
> }
>
> public void sleep(int seconds) {
> try {
> Thread.sleep(seconds * 1000);
> }
> catch(InterruptedException ie)
> {
> }
> }
> }
> -------------------------------------------------
>
>
> The errors :
>
> C:> javac Codec1.java 2>e
> C:> type e
>
> Codec1.java:47: inner class Codec1. EncBtnAL is an abstract class. It
> can't
> be instantiated.
> encodeBtn.addActionListener(new EncBtnAL());
> ^
> Codec1.java:48: inner class Codec1. DecBtnAL is an abstract class. It
> can't
> be instantiated.
> decodeBtn.addActionListener(new DecBtnAL());
> ^
> Codec1.java:59: inner class Codec1. EncBtnAL must be declared abstract. It
> does not define void actionPerformed(java.awt.event.ActionEvent) from
> interface java.awt.event.ActionListener.
> public class EncBtnAL implements ActionListener {
> ^
> Codec1.java:70: inner class Codec1. DecBtnAL must be declared abstract. It
> does not define void actionPerformed(java.awt.event.ActionEvent) from
> interface java.awt.event.ActionListener.
> public class DecBtnAL implements ActionListener {
> ^
> 4 errors
>
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