Help me,, I cannot arrang the position of code

Question

//get hash value for the registering file
byte[] digestBuf = null;
try {
MessageDigest digest1=MessageDigest.getInstance("MD5");
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
byte[] buff = new byte[1024];
int chunk = 1024;
int bytesRead = 0;
while((bytesRead=bis.read(buff, 0, chunk)) != -1) // <-- Notice we don't go into loop at end-of-file
digest1.update(buff, 0, bytesRead);
digestBuf = digest1.digest(); //get hash
catch( Exception ea ){
ea.printStackTrace();
// return digestBuf;
String hexChar = null;
if(digestBuf!= null) {
for(int i=0; i<digestBuf.length; i++) {
     if(digestBuf[i] > 0)
//Convert hex string to two-character string for output
     hexChar = Integer.toHexString(digestBuf);
     else if(digestBuf[i]< 0)
     hexChar = Integer.toHexString(digestBuf[i]).substring(6);
     else
     hexChar = "00";
     //System.out.print(hexChar);
String S = new String();
StringBuffer buffer=new StringBuffer();
S=buffer.append(hexChar).toString();
I want to write the path of file, and filename, and value of S into a.txt. Where Can I put following code.
File filename = new File("E:\\a.txt");
FileOutputStream fos = new FileOutputStream(filename);
DataOutputStream out = new DataOutputStream(fos);
out.writeChars(file.getName());
out.write(S);
out.flush();
out.close();
fos.close();
Can anyone arrange the code for me? Thank you very much

Answer 1

//get hash value for the registering file
  byte[] digestBuf = null;
    try {
      MessageDigest digest1=MessageDigest.getInstance("MD5");
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
      byte[] buff = new byte[1024];
      int chunk = 1024;
      int bytesRead = 0;
      while((bytesRead=bis.read(buff, 0, chunk)) != -1)   // <-- Notice we don't go into loop at end-of-file
      digest1.update(buff, 0, bytesRead);
      digestBuf = digest1.digest(); //get hash
    catch( Exception ea ){
      ea.printStackTrace();
   // return digestBuf;
String hexChar = null;
   if(digestBuf!= null) {
      for(int i=0; i<digestBuf.length; i++) {
     if(digestBuf[i] > 0)
         //Convert hex string to two-character string for output
       hexChar = Integer.toHexString(digestBuf);
     else if(digestBuf[i]< 0)
     hexChar = Integer.toHexString(digestBuf[i]).substring(6);
     else
     hexChar = "00";
     //System.out.print(hexChar);
String S = new String();
StringBuffer buffer=new StringBuffer();
S=buffer.append(hexChar).toString();
jTextArea1.append(S);
//jTextArea1.append(S);
System.out.println();
try{
File filename = new File("E:\\a.txt");
FileOutputStream fos = new FileOutputStream(filename);
DataOutputStream out = new DataOutputStream(fos);
out.writeChars(file.getName());
out.write(S);
out.flush();
out.close();
fos.close();
catch( Exception ea ){
ea.printStackTrace();
It displays ""Frame1.java": Error #: 300 : variable S not found in class fileintegritychecker.Frame1 at line 127, column 11
What is wrong with it?"