单击按钮后出现JOptionPane

Question

我必须创建一个用于借出媒体项目的库。到目前为止，我有GUI来查看它应该如何，但现在我已经打了一个砖墙，接下来该做什么。当用户点击“添加”按钮时按钮，两个提示应该打开询问用户标题然后格式，但我不知道该怎么做才能实现它。任何帮助都会很棒！

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Scanner;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;



public class FinalView extends JFrame{
private JButton add;
private JButton checkOut;
private JButton checkIn;
private JButton delete;
private JScrollPane display;
private JList jlist;

Scanner input = new Scanner(System.in);


public FinalView(){
    setTitle("My Library");
    setSize(500,500);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//change later for save feature per printout
    setLocationRelativeTo(null);    
    setLayout(new BorderLayout());



    JPanel buttonPanel = new JPanel();
    add(buttonPanel, BorderLayout.SOUTH);
    buttonPanel.setLayout(new GridLayout(1, 4, 8, 8));
    add = new JButton("Add");
    checkOut = new JButton("Check Out");
    checkIn = new JButton("Check In");
    delete = new JButton("Delete");
    buttonPanel.add(add);
    buttonPanel.add(checkOut);
    buttonPanel.add(checkIn);
    buttonPanel.add(delete);

    String[] movie = {"Star Wars", "StarTrek"};


    Library call = new Library();

    jlist = new JList(movie);
    jlist.setVisibleRowCount(4);
    jlist.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    add(new JScrollPane(jlist));
    setVisible(true);


    ActionListener listener = null;
    add.addActionListener(listener);


}


 public void actionPerformed(ActionEvent e) {       
     JOptionPane.showInputDialog("Title:");
     String title = input.nextLine();
     JOptionPane.showInputDialog("Format:");
     String format = input.nextLine();
     addNewItem(title, format);
 }
private void addNewItem(String title, String format) { 
    MediaItem lib = new MediaItem(title, format);
    // TODO Auto-generated method stub

}

public static void main(String[] args) {
    new FinalView();

}

}