FileHashing.java

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class FileHashing {
	public static void main(String[] args)throws Exception {
		System.out.println(hashString("WordFactorial.java","SHA-256"));
 }		
	
	public static String hashString(String s,String hashType) throws NoSuchAlgorithmException {
	    byte[] hash = null;
	    try {
	        MessageDigest md = MessageDigest.getInstance(hashType);
	        hash = md.digest(s.getBytes());

	    } catch (NoSuchAlgorithmException e) { e.printStackTrace(); }
	    StringBuilder sb = new StringBuilder();
	    for (int i = 0; i < hash.length; ++i) {
	        String hex = Integer.toHexString(hash[i]);
	        if (hex.length() == 1) {
	            sb.append(0);
	            sb.append(hex.charAt(hex.length() - 1));
	        } else {
	            sb.append(hex.substring(hex.length() - 2));
	        }
	    }
	    return sb.toString();
	}
}