public boolean  login(String username,String password) throws RemoteException{
    String[] st = new String[2];
    st[0] = username;
    st[1] = password;
    String checkUser ="";
    String checkPass="";
    ResultSet v =  x.read("SELECT * FROM "user" WHERE ("username" = ? AND "password" = ?)", st);
    try{
    checkUser = v.getString(1);
    checkPass = v.getString(2);
        if((checkUser.equalsIgnoreCase(username)) && (checkPass.equalsIgnoreCase(password)))
    {
        return true;
    }
    else
    {
       return false;
    }
    } catch (SQLException ex) {
        return false;
    }
}

private void loginbtnActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
    try {
        NewClass n = new NewClass();
        if (n.NewClass().login(txtusername.getText(),txtpassword.getText())) {
            System.out.println("yes");
        }else{
            System.out.println("no");
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

}