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Javax crypto CipherOutputStream

import java.io.FileOutputStream; import java.io.ObjectOutputStream; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.CipherOutputStream; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec; public class MainClass {   public static void main(String args[]) throws Exception {     KeyGenerator kg = KeyGenerator.getInstance("DES");     kg.init(new SecureRandom());     SecretKey key = kg.generateKey();     SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");     Class spec = Class.forName("javax.crypto.spec.DESKeySpec");     DESKeySpec ks = (DESKeySpec) skf.getKeySpec(key, spec);     ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("keyfile"));     oos.writeObject(ks.getKey());     Cipher c = Cipher.getInstance("DES/CFB8/NoPadding");     c.init(Cipher.ENCRYPT_MODE, key);     CipherOutputStream cos = new CipherOutputStream(new FileOutputStream("ciphertext"), c);     PrintWriter pw = new PrintWriter(new OutputStreamWriter(cos));     pw.println("Stand and unfold yourself");     pw.close();     oos.writeObject(c.getIV());     oos.close();   } }