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我正在做一个项目，该项目需要我将颜色和颜色的十六进制代码从文本文件中读取到地图中。我创建了一个 TreeMap，它在屏幕上正确存储和打印，但我不知道如何让它将数据发送到组合框。到目前为止，这是我的代码...

public class Project extends JFrame{

    JComboBox CBColor = new JComboBox(new String[]
    {"", "AQUA", "BLACK", "BLUE", "BROWN", "FUCHSIA", "GRAY",
    "GREEN", "INDIGO", "LIME", "MAROON", "NAVY", "ORANGE",
    "PINK", "PURPLE", "RED", "SIENNA", "TAN", "TEAL", "WHITE", "YELLOW"});
    JTextArea TAText = new JTextArea(5, 25);
    JButton BApply = new JButton("Apply");
    JButton BExit = new JButton("Exit");

    public Project() {
        JPanel SelectionPanel = new JPanel(new BorderLayout());
        SelectionPanel.add(CBColor, BorderLayout.NORTH);
        SelectionPanel.add(TAText, BorderLayout.CENTER);
        JPanel ApplyPanel = new JPanel(new FlowLayout(FlowLayout.CENTER, 10, 10));
        ApplyPanel.add(BApply);
        ApplyPanel.add(BExit);
        add(SelectionPanel, BorderLayout.NORTH);
        add(ApplyPanel, BorderLayout.SOUTH);
        BApply.addActionListener(new ButtonListener());
        BExit.addActionListener(new ExitButtonListener());
    }

    private class ButtonListener implements ActionListener {
            public void actionPerformed(ActionEvent e) {
                String BGColor = "";
                if (CBColor.getSelectedItem() == "AQUA")
                    BGColor = "#00FFFF";
                else if (CBColor.getSelectedItem() == "BLACK")
                    BGColor = "#000000";
                else if (CBColor.getSelectedItem() == "BLUE")
                    BGColor = "#0000FF";
                else if (CBColor.getSelectedItem() == "BROWN")
                    BGColor = "#A52A2A";
                else if (CBColor.getSelectedItem() == "FUCHSIA")
                    BGColor = "#FF00FF";
                else if (CBColor.getSelectedItem() == "GRAY")
                    BGColor = "#BEBEBE";
                else if (CBColor.getSelectedItem() == "GREEN")
                    BGColor = "#008000";
                else if (CBColor.getSelectedItem() == "INDIGO")
                    BGColor = "#4B0082";
                else if (CBColor.getSelectedItem() == "LIME")
                    BGColor = "#00FF00";
                else if (CBColor.getSelectedItem() == "MAROON")
                    BGColor = "#800000";
                else if (CBColor.getSelectedItem() == "NAVY")
                    BGColor = "#000080";
                else if (CBColor.getSelectedItem() == "ORANGE")
                    BGColor = "#FFA500";
                else if (CBColor.getSelectedItem() == "PINK")
                    BGColor = "#FFC0CB";
                else if (CBColor.getSelectedItem() == "PURPLE")
                    BGColor = "#800080";
                else if (CBColor.getSelectedItem() == "RED")
                    BGColor = "#FF0000";
                else if (CBColor.getSelectedItem() == "SIENNA")
                    BGColor = "#A0522D";
                else if (CBColor.getSelectedItem() == "TAN")
                    BGColor = "#D2B48C";
                else if (CBColor.getSelectedItem() == "TEAL")
                    BGColor = "#008080";
                else if (CBColor.getSelectedItem() == "WHITE")
                    BGColor = "#FFFFFF";
                else if (CBColor.getSelectedItem() == "YELLOW")
                    BGColor = "#FFFF00";
                TAText.setBackground(Color.decode(BGColor));
            }
    }

    private class ExitButtonListener implements ActionListener {
            public void actionPerformed(ActionEvent e) {
            System.exit(0);
            }
    }

    public static void main(String[] args) throws Exception {

        Map<String, String> ColorsHex = new TreeMap<String, String>();

        BufferedReader input = new BufferedReader(new FileReader("colors.txt"));
        String line = "";
        while ((line = input.readLine()) != null) {
            String parts[] = line.split(", ");
            ColorsHex.put(parts[0], parts[1]);
        }
        input.close();        
        System.out.println(ColorsHex);
        System.out.print(ColorsHex.keySet());
        System.out.print(ColorsHex.get("RED"));


        Project frame = new Project();
        frame.setTitle("Colors");
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);



    }


}

这会编译并运行，但我试图让组合框读取导入的值而不是输入它们，并让侦听器读取元素而不是输入它们。

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1 回答 1

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JComboBox没有采用Set. 您将不得不使用可用的构造函数之一。

更新：

一种解决方案是最初使用默认构造函数JComboBox()，调用 load 从文件中加载颜色，然后将模型设置为JComboBox：

protected void loadColors() throws IOException {
   Map<String, String> colorsHexMap = new TreeMap<String, String>();
   BufferedReader input = new BufferedReader(new FileReader("colors.txt"));
   ...

   Set<String> keySet = colorsHexMap.keySet();
   String[] keyArray = keySet.toArray(new String[keySet.size()]);
   ComboBoxModel<String> model = new DefaultComboBoxModel<>(keyArray);
   CBColor.setModel(model);
}

此外，如果您创建TreeMap一个类成员变量，您将能够将您的十六进制颜色选择简化为 2 行：

String bgColor = colorsHexMap.get(CBColor.getSelectedItem());
TAText.setBackground(Color.decode(bgColor));
于 2012-10-13T19:42:24.260 回答