Meet error when extending FileWriter with JDK1.5.0

Question

There is a fragment of Java code as follows:
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
public class FilterFileWriter extends FileWriter
     private short _tokenCounter = 0;     
     private StringBuffer _buffer = new StringBuffer();
     private String _pattern = "Bioseq-set";
     private String _lastAppend = "";     
     private boolean _doWrite = true;
     public void write(char[] arg0, int arg1, int arg2) throws IOException
          super.write(arg0, arg1, arg2);
     public void write(int arg0) throws IOException
          if( _doWrite )
               super.write( arg0 );
          if(_lastAppend.equalsIgnoreCase( pattern ) && !doWrite && arg0 == 60 )
               _doWrite = true;
               super.write( arg0 );
               _lastAppend = "";
     public void write(String arg0, int arg1, int arg2) throws IOException
          super.write(arg0, arg1, arg2);
     public void write(char[] arg0) throws IOException
          //Launcher.getLoggerInstance().info( "Writing array " + arg0[0] );
          super.write(arg0);
     public void write(String str) throws IOException
          if( str.equalsIgnoreCase( _pattern ) )
               if( _lastAppend.equalsIgnoreCase( "</" ) )
                    _doWrite = false;
                    _lastAppend = str;
                    return;
          if( str.equalsIgnoreCase( "</" ) )
               _lastAppend = str;
               return;
          if( _lastAppend.equalsIgnoreCase( "</" ) )
               super.write( _lastAppend );
          if( _doWrite )
               super.write( str );
          if( str.trim().length() > 0 )
               _lastAppend = str;
     public void write( String str, boolean force ) throws Exception
          if( force )
               super.write( str );
     public FilterFileWriter(File arg0) throws IOException
          super(arg0);
     public FilterFileWriter(File arg0, boolean arg1) throws IOException
          super(arg0, arg1);
     public FilterFileWriter(FileDescriptor arg0)
          super(arg0);
     public FilterFileWriter(String arg0) throws IOException
          super(arg0);
     public FilterFileWriter(String arg0, boolean arg1) throws IOException
          super(arg0, arg1);
     private boolean hasPattern()
          return buffer != null && buffer.toString().indexOf( _pattern ) >= 0;
When compiling, meet following error:
The return type is incompatible with Appendable.append(char), Writer.append(char),Writer.append(char)
Why? and How to resolve this error?
Thanks a lot!

Answer 1

Did you ever find a solution to this problem? I just installed jdk 1.5_03 and I get the following error from a class that does not have any of the methods described in the error below.
The return type is incompatible with Appendable.append(char), Writer.append(char), Writer.append(char)