组合框代码是否正确？

Question

以下代码看起来是否正确，是否有错误？我必须创建一个音乐流派的下拉框。

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: "); 

     selectedMusic = new JTextField(10); 
     selectedMusic.setEditable(flase); 

     selectedMusicPanel.add(label); 
     selectedMusicPanel.add(selectedMusic); 
    } 

    private class ComboBoxListener implements ActionListener 
    { 
     public void actionPerformed(ActionEvent e) 
     { 
      String selection = (String) MusicBox.getSelectedItem(); 
      selectedMusic.setText(selection); 

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

Answer 1

尝试ideone.com来解释它。