HashSHA class

package javaapplication1;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
//using SHA to hash string
public class HashSHA {
    public String hash(String data,String hashAlgorithm){
            String hashed="";
            try {
                MessageDigest sha = MessageDigest.getInstance(hashAlgorithm);
                sha.update(data.getBytes());
                byte byteData []=sha.digest();
                //convert byte to hex
                StringBuilder sb = new StringBuilder();
                for (int i = 0;i<byteData.length;i++){
                sb.append(Integer.toString((byteData[i]&0xff)+0x100,16).substring(1));
            }
                hashed=sb.toString();
            }catch (NoSuchAlgorithmException e){
                System.out.println(e.getMessage());
            }
            return hashed;
        }
//using SHA to hash file
    public String hashFile(String file, String hashAlgorithm){
        String hashed = "";
        try {
            MessageDigest sha=MessageDigest.getInstance(hashAlgorithm);
            FileInputStream fs =new FileInputStream(file);
            byte [] dataBytes=new byte [1024];
            int nread=0;
            while((nread=fs.read(dataBytes))!=-1){
                sha.update(dataBytes,0,nread);
            }
            byte[] mdbytes=sha.digest();
            //convert byte to hex
            StringBuilder sb=new StringBuilder();
            for(int i=0;i<mdbytes.length;i++){
                sb.append(Integer.toString((mdbytes[i]&0xff)+0x100,16).substring(1));
            }
            hashed=sb.toString();
        }catch(NoSuchAlgorithmException e){
            System.out.println(e.getMessage());
        }catch (FileNotFoundException e){
            System.out.println(e.getMessage());
        }catch (IOException e){
            System.out.println(e.getMessage());
        }
        return hashed;
    }
    public static void main(String[] args) {
        //using HashSHA method to hash string
        HashSHA sha = new HashSHA();
        String msg = "Selamat datang di JAVA Message Digest";
        System.out.println("Message: "+msg);
        String hashed = sha.hash(msg,"SHA-1");
        System.out.println("Hash SHA-1: "+hashed);
        hashed=sha.hash(msg,"SHA-256");
        System.out.println("Hash SHA-256: "+hashed);
        hashed=sha.hash(msg,"SHA-512");
        System.out.println("Hash SHA-512: "+hashed);
        //using hashFile method to hash file
        HashSHA sha2=new HashSHA();
        String file = "C:/Users/Suwandaru/Downloads/Schedule IT RSC Project 2014 141124.xlsx";
        System.out.println("File hashing: "+file);
        String fileHashed=sha2.hashFile(file,"SHA-1");
        System.out.println("Hash SHA-1: "+fileHashed);
        fileHashed=sha2.hashFile(file,"SHA-256");
        System.out.println("Hash SHA-256: "+fileHashed);
        fileHashed=sha2.hashFile(file,"SHA-512");
        System.out.println("Hash SHA-512: "+fileHashed);
    }
}