小编Sam*_*ite的帖子

以下代码看起来是否正确并且是否有任何错误？我必须创建一个音乐类型的下拉框.

我的代码:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ComboBoxWindow extends JFrame
{
    private JPanel musicPanel;
    private Jpanel selectMusicPanel;
    private JComboBox MusicBox;
    private JLabel label;
    private JTextField selectedMusic;


    private String[] music = {"Rock","Metal","Electro","Pop","Country","Jazz","Indie"};

    public ComboBoxWindow()
    {
        super("Combo Box Demo");

        setDefultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setLayout(new BorderLayout());

        buildMusicPanel();
        buildSelectedMusicPanel;

        add(musicPanel,BorderLayout.CENTER);
        add(selectedMusicPanel, BorderLayout.SOUTH);

        pack();
        setVisible(true);
    }

    private void buildMusicPanel()
    {
        musicPanel = new JPanel();

        musicBox = new JComboBox(music);

        musicBox.addActionListener(new ComboBoxListener());
        musicPanel.add(MusicBox);
    }

    private void buildSelectedCoffeePanel()
    {
        selectedMusicPanel = new JPanel();

        label = new JLabel("You selected: …