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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