vasko

package xx;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class FileHandler {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		String username;
		String password;
		 Scanner scanner = new Scanner(System.in);

		  BufferedWriter buffWriter= null;
	      FileWriter fileWriter = null;
	      for (int i=0;i<3;i++) {

		      try {
		    	 username = scanner.next();
		    	 password = scanner.next();

		    	 User user = new User(username, password);

		         File file = new File("someNewFile.txt");
		         fileWriter = new FileWriter(file.getAbsoluteFile());
		         buffWriter= new BufferedWriter(fileWriter);
		         buffWriter.write(user.getUsername());
		         buffWriter.write(user.getPassword());
		         buffWriter.flush();
		         System.out.println("Ready!");
		      } catch (IOException e) {
		           e.printStackTrace();
		      }finally{
		        if(buffWriter!=null ){
		            try {
		                buffWriter.close();
		            } catch (IOException e) {
		                e.printStackTrace();
		               }
		        }if(fileWriter != null){
		            try {
		               fileWriter.close();
		            } catch (IOException e) {
		               e.printStackTrace();
		            }
		         }
		       }
	      }

	}
}



package xx;

public class MyException extends Exception{

	@Override
	public  String getMessage() {
		return "Bad";
	}

}







package xx;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class UserValidation {

	private static Pattern pattern;
	private static Pattern passwordPattern;

	private static Matcher matcher;

	private static final String USERNAME_PATTERN = "^[a-z]{3,10}$";
	private static final String PASSWORD_PATTERN = "^[A-Z]{5,10}%";

	public UserValidation(){

	pattern = Pattern.compile(USERNAME_PATTERN);
	passwordPattern = Pattern.compile(PASSWORD_PATTERN);

	}

	public static boolean usernameValidator(String username) {

		matcher = pattern.matcher(username);
		return matcher.matches();

	}

	public static boolean passwordValidator(String password) {

		matcher = passwordPattern.matcher(password);
		return matcher.matches();

	}
}












package xx;

public class User {

	public User(String username, String password) {
		super();
		this.username = username;
		this.password = password;
	}
	String username;
	String password;

	public String getUsername() {
		return username;
	}
	public void setUsername(String username) throws MyException {
		if (!UserValidation.usernameValidator(username))throw new MyException();
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password)throws MyException {
		if(!UserValidation.passwordValidator(password))throw new MyException();
		this.password = password;
	}

}