访问在私有方法中创建的公共变量

Question

我知道这个问题可能看起来与之前发布的几个问题相似，但我尝试了多种解决方案，但似乎都没有用。所以基本上我有这个公共静态变量当前图书馆员，它在一个私有方法中被实例化，我需要能够从这个类之外访问这个当前图书馆员对象，从我读过的公共静态应该已经解决了这个但是它没有，我真的迷失了这个问题。

public class LoginForm extends javax.swing.JFrame {

/**
 * Creates new form LoginForm
 */
public static Librarian currentLibrarian;
public static int loginAttemptsRemaining = 5;
/**
 * failedAttempt() -- decrements the remaining login attempts, then updates the displayed value
 * if the number of login attempts is exceeded, the login button is disabled and cannot be clicked again
 */
public void failedAttempt(){
    loginAttemptsRemaining--;
    attemptCountLabel.setText(""+loginAttemptsRemaining);
    if(loginAttemptsRemaining ==0){
        loginButton.setEnabled(false);
    }
}
public Librarian getNewLibrarian(){
    return this.currentLibrarian;
}
public LoginForm() {
    initComponents();
}                     

private void loginButtonActionPerformed(java.awt.event.ActionEvent evt) {                                            
    if(usernameField.getText().isEmpty()||passwordField.getText().isEmpty()){
        JOptionPane.showMessageDialog(null, "Please Appropriately Fill all Fields");
    }
    else{
        String inputUsername = usernameField.getText();
        int inputPassword = Integer.parseInt(passwordField.getText());
        ConnectionDB connect= new ConnectionDB();
        try {
            Statement stm = (connect.connectDB()).createStatement();
            String query = "select * from library.username_password where username = '"+inputUsername+"';";
            ResultSet usernamePasswordResultSet = stm.executeQuery(query);
            /**
             * When an invalid username is requested from mySQL database, a 'false' boolean value is returned in Result Set
             * Thus if the username input is invalid the result of userInfoResultSet.next() should be false
             * furthermore .next() moves cursor to start position of the result set and allows us to begin reading values
             */
            if(!usernamePasswordResultSet.next()){
                failedAttempt();
                JOptionPane.showMessageDialog(null, "Username is Invalid");
            }
            else{
                /**if the username is valid we can retrieve the stored password at that location
                 * then verify password validity
                 */
                int databasePassword = usernamePasswordResultSet.getInt("password");
                if(databasePassword != inputPassword){
                    failedAttempt();
                    JOptionPane.showMessageDialog(null, "Password is Invalid");                        
                }
                /**
                 * if both username and password are valid we need to verify what type of user we have
                 * then redirect them to the respective main menu
                 */ 
                else{
                    boolean isLibrarian = usernamePasswordResultSet.getBoolean("isLibrarian");
                    if(isLibrarian){
                        currentLibrarian = new Librarian(usernamePasswordResultSet.getBoolean("isHeadLibrarian"));
                        this.setVisible(false);
                        new LibrarianMainMenuForm().setVisible(true);