String password = jPassword.getText();
    String username = jtxtUsername.getText();


    if (((password.contains("alphabet soup") && (username.contains("griffin.keyes"))))
            ||(password.contains("M0nk3y business") && (username.contains("donald.monkey")))){
        jtxtUsername.setText(null);
        jPassword.setText(null);
        systemExit();

        ZooKeeper Info = new ZooKeeper();
        Info.setVisible(true);
    }
    else if (((password.contains("animal doctor") && (username.contains("rosario.dawson"))))
            ||(password.contains("letmein") && (username.contains("bruce.grizzlybear")))){
        jtxtUsername.setText(null);
        jPassword.setText(null);
        systemExit();

        Admin Info = new Admin();
        Info.setVisible(true);
    }
    else if (((password.contains("secret password") && (username.contains("bernie.gorilla"))))
            ||(password.contains("grizzly1234") && (username.contains("jerome.grizzlybear")))){
        jtxtUsername.setText(null);
        jPassword.setText(null);
        systemExit();

        Veterinarian Info = new Veterinarian();
        Info.setVisible(true);
    }
    else{
       JOptionPane.showMessageDialog(null,"Invalid Login Details", "Login Error", JOptionPane.ERROR_MESSAGE);
       jtxtUsername.setText(null);
       jPassword.setText(null);
    }
}