How do I extract Sequences from GenBank/EMBL/UniProt/FASTA/INSDseq and write them as Fasta?

To perform this task we are going to extend the general reader from the previous demo and include in it the ability to write sequence data in fasta format.One example are provided here:

Following this link you can download some example files.

```java import java.io.BufferedReader; import java.io.File; import java.io.FileOutputStream; import java.io.FileReader;

import org.biojavax.Namespace; import org.biojavax.RichObjectFactory; import org.biojavax.bio.seq.RichSequence; import org.biojavax.bio.seq.RichSequenceIterator;

public class ReadWriteGES_BJ1_6{

   public static void main(String[] args) {
       BufferedReader br = null;
       Namespace ns = null;
               //this path is used for destination file too
       String filePath= "/whereYourFileIs/sequences";
       String insdExt=".gbc";
       String fastaExt=".FASTA";

       try{
           br = new BufferedReader(new FileReader(filePath+insdExt));
           ns = RichObjectFactory.getDefaultNamespace();

               // You can use any of the convenience methods found in the BioJava 1.6 API
                       RichSequenceIterator rsi = RichSequence.IOTools.readINSDseqDNA(br, ns);

           // Since a single file can contain more than a sequence, you need to iterate over
           // rsi to get the information.
                       while (rsi.hasNext()) {
                           RichSequence seq = rsi.nextRichSequence();
                           RichSequence.IOTools.writeFasta(new 
                                        FileOutputStream(new File(filePath+fastaExt)), seq, ns);
                           System.out.println(
                                   seq.toString() +
                                   " has " + seq.countFeatures() + 
                                   " features");
                       }

       }
       catch(Exception be){
           be.printStackTrace();
           System.exit(-1);
       }
   }

} ```