code_2

package com.currencycal;

import java.awt.GridLayout;
import java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Scanner;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextArea;


public class Login extends JFrame implements ActionListener{
    private JTextArea txtUsr;
    private JPasswordField txtPass;
    private JButton btnLogin;
    private JButton newUserName;


    public Login() throws HeadlessException {


    	// defining text areas and buttons
    	txtUsr = new JTextArea(); //username text area

    	txtPass = new JPasswordField();//password text area

        btnLogin = new JButton("Login");//button "Login"

        newUserName = new JButton("Sign UP");
        //defining ends

        // Making Layout
        GridLayout grid = new GridLayout(4,1);
        setBounds(0, 0, 200, 200);
        setLayout(grid);
      // layout made above 3 lines

        //drawing and labeling text and button on Frame
        add(new JLabel("User Name: "));
        add(txtUsr);
        add(new JLabel("Password: "));
        add(txtPass);

        add(btnLogin); //adding button on screen
        add(newUserName); // adding signup button
        //frame exits on close button
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //making login button into action
        btnLogin.addActionListener(this);

        //signup button details
        newUserName.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            	new SignUp().show();
            	setVisible(false);
                dispose();

            }
        });
    }

    @Override
    public void actionPerformed(ActionEvent e)  {

    	 String textUser = txtUsr.getText();
     	String textPass = txtPass.getText();

        File f1 = new File("newUser.txt");
    	if(!f1.exists())
    	{
    		System.out.println("File not FOund");
    	}


        String dataPass2 = "";
    	Scanner S = null;
		try {
			S = new Scanner(f1);
		} catch (FileNotFoundException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		String name3 = "";
		String pass3 = "";
    	while (S.hasNextLine()) {
           dataPass2 = S.nextLine();

           String[] parts = dataPass2.split("-", 2);
            name3 = parts[0];
            pass3 = parts[1];

            //System.out.println("this is "+name3);
            //System.out.println("and"+pass3);




    	//comparing with previous record
    	if(textUser.equals("")&&textPass.equals(""))
    	{

    		JOptionPane.showMessageDialog(null,"Please insert UserName and Password");
    		break;
    	}
    	else if(!textUser.equals(name3) && !textPass.equals(pass3))
    	{

    		JOptionPane.showMessageDialog(null,"wrong user name or password try again");
    		break;
    	}

    	else
    	{
    		name3 = pass3 = "";
    		//graphic call
    		new convertCurrency().show();
            this.setVisible(false);
            this.dispose();
    		}
    	}	};

}