如何突出显示从comboBox中选择的特定标签？

Question

因此，我在我的JComboBox中有一个用户数据库，左侧也是这些用户的列表。我想要做的是编写一个程序，当从JComboBox中选择该用户时，请在左侧的list(JLabel)中突出显示他。我希望我足够具体。

Answer 1

public class Test2 extends JFrame { 

    private static final long serialVersionUID = 1L; 
    private JPanel panel; 
    private JComboBox<String> comboBox; 
    private JList<String> list; 

    public Test2() { 
     panel = new JPanel(); 
     getContentPane().add(panel, BorderLayout.NORTH); 
     GridBagLayout gbl_panel = new GridBagLayout(); 
     panel.setLayout(gbl_panel); 

     comboBox = new JComboBox<String>(); 
     comboBox.addItem("User1"); 
     comboBox.addItem("User2"); 
     GridBagConstraints gbc_comboBox = new GridBagConstraints(); 
     gbc_comboBox.weightx = 1.0; 
     gbc_comboBox.insets = new Insets(0, 0, 5, 0); 
     gbc_comboBox.fill = GridBagConstraints.HORIZONTAL; 
     gbc_comboBox.gridx = 0; 
     gbc_comboBox.gridy = 0; 
     panel.add(comboBox, gbc_comboBox); 

     DefaultListModel<String> listModel = new DefaultListModel<>(); 
     listModel.addElement("User1"); 
     listModel.addElement("User2"); 

     list = new JList<String>(listModel); 

     GridBagConstraints gbc_lblNewLabel = new GridBagConstraints(); 
     gbc_lblNewLabel.weightx = 1.0; 
     gbc_lblNewLabel.gridx = 1; 
     gbc_lblNewLabel.gridy = 0; 

     panel.add(list, gbc_lblNewLabel); 

     comboBox.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent e) { 
       String selectedItem = String.valueOf(comboBox.getSelectedItem()); 

       if (selectedItem.equals("User1")) 
        list.setSelectedValue("User1", true); 
       else if (selectedItem.equals("User2")) 
        list.setSelectedValue("User2", true); 
      } 
     }); 
    } 

    public static void main(String[] args) { 
     Test2 myFrame = new Test2(); 
     myFrame.setVisible(true); 
     myFrame.setSize(new Dimension(400, 500)); 
     myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    } 
} 

请问这个工作适合你吗？我不知道你为什么在JList中使用JLabel。所以我已将名单从JList<JLabel>更改为JList<String>