String pass;
String user;
user = txtUser.getText();
pass = txtPass.getText();

if(pass.equals("blue") && user.equals("bob") ){
    lblDisplay.setText("Credentials Accepted.");
}
else{
    lblDisplay.setText("Please try again.");
}

import java.util.Scanner; // I use scanner because it's command line.

public class Login {
public void run() {
    Scanner scan = new Scanner (new File("the\dir\myFile.extension"));
    Scanner keyboard = new Scanner (System.in);
    String user = scan.nextLine();
    String pass = scan.nextLine(); // looks at selected file in scan

    String inpUser = keyboard.nextLine();
    String inpPass = keyboard.nextLine(); // gets input from user

    if (inpUser.equals(user) && inpPass.equals(pass)) {
        System.out.print("your login message");
    } else {
        System.out.print("your error message");
    }
}
}

import java.util.Scanner;
public class BATM {

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);

    String username;
    String password;

    System.out.println("Log in:");
    System.out.println("username: ");
    username = input.next();

    System.out.println("password: ");
    password = input.next();

    //users check = new users(username, password);

    if(username.equals(username) && password.equals(password))
        System.out.println("You are logged in");



}

}

import java.util.Scanner;

public class LoginMain {

public static void main(String[] args) {

    String Username;
    String Password;

    Password = "123";
    Username = "wisdom";

    Scanner input1 = new Scanner(System.in);
    System.out.println("Enter Username : ");
    String username = input1.next();

    Scanner input2 = new Scanner(System.in);
    System.out.println("Enter Password : ");
    String password = input2.next();

    if (username.equals(Username) && password.equals(Password)) {

        System.out.println("Access Granted! Welcome!");
    }

    else if (username.equals(Username)) {
        System.out.println("Invalid Password!");
    } else if (password.equals(Password)) {
        System.out.println("Invalid Username!");
    } else {
        System.out.println("Invalid Username & Password!");
    }

}

}

String user;
String pass;

Scanner scan = new Scanner(new File("File.txt"));

while(scan.hasNext){ //While the file still has more lines remaining
     if(scan.nextLine() == user){
          if(scan.nextLine == pass){
                   lblDisplay.setText("Credentials Accepted.");
          }
          else{
               lblDisplay.setText("Please try again.");
          }
     }
}

import java.<span class="q39pbqr9" id="q39pbqr9_9">net</span>.*;
import java.io.*;

<span class="q39pbqr9" id="q39pbqr9_1">public class</span> A
{
    static String user = "user";
    static String pass = "pass";
    static String param_user = "username";
    static String param_pass = "password";
    static String content = "";
    static String action = "action_url";
    static String urlName = "url_name";
    public static void main(String[] args)
    {
        try
        {
            user = URLEncoder.encode(user, "UTF-8");
            pass = URLEncoder.encode(pass, "UTF-8");
            content = "action=" + action +"&" + param_user +"=" + user + "&" + param_pass + "=" + pass;
            URL url = new URL(urlName);
            HttpURLConnection urlConnection = (HttpURLConnection)(url.openConnection());
            urlConnection.setDoInput(true);
            urlConnection.setDoOutput(true);
            urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            urlConnection.setRequestMethod("POST");
            DataOutputStream dataOutputStream = new DataOutputStream(urlConnection.getOutputStream());
            dataOutputStream.writeBytes(content);
            dataOutputStream.flush();
            dataOutputStream.close();

            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
            String responeLine;
            StringBuilder response = new StringBuilder();
            while ((responeLine = bufferedReader.readLine()) != null)
            {
                response.append(responeLine);
            }
            System.out.println(response);
        }catch(Exception ex){ex.printStackTrace();}
    }