Question

如何基于组合框选项显示JLabel。当我运行代码时，所有JLabel都会立即显示出来。

combo1.addActionListener(this);
panel.add(combo1);
panel.add(img1);
panel.add(img2);
panel.add(img3);

frame.add(panel);

    img1.setText("<html> Image : <a href=\"\">Image1/</a></html>");   
    img2.setText("<html> Image : <a href=\"\">Image2/</a></html>");
    img3.setText("<html> Image : <a href=\"\">Image3/</a></html>");

    img1.setCursor(new Cursor(Cursor.HAND_CURSOR));
    img2.setCursor(new Cursor(Cursor.HAND_CURSOR));
    img3.setCursor(new Cursor(Cursor.HAND_CURSOR));

我使用mouseListener检查传入goWebsite（）函数的标签，然后根据它添加标签的超链接。

private void goWebsite(final JLabel website) {
        website.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                if(website == img1){
                try {
                    Desktop.getDesktop().browse(new URI("http://2.bp.blogspot.com/_2dxp9ORKKAM/TBZpViy7O1I/AAAAAAAABGY/zitq3ZLA8K4/s1600/red.png"));
                } catch (URISyntaxException | IOException ex) {
                    //It looks like there's a problem
                }
            }
                if(website == img2){
                    try {
                        Desktop.getDesktop().browse(new URI("http://www.pratikbagaria.com/wp-content/uploads/2011/04/BlueGreenPink.jpg"));
                    } catch (URISyntaxException | IOException ex) {
                        //It looks like there's a problem
                    }
                }
                if(website == img3){
                    try {
                        Desktop.getDesktop().browse(new URI("http://i.imgur.com/9OPnZNk.png"));
                    } catch (URISyntaxException | IOException ex) {
                        //It looks like there's a problem
                    }
                }
                if(website == img4){
                    try {
                        Desktop.getDesktop().browse(new URI("http://www.solidbackgrounds.com/images/three/2048x2048/2048x2048-fluorescent-orange-fluorescent-pink-fluorescent-yellow-three-color-background.jpg"));
                    } catch (URISyntaxException | IOException ex) {
                        //It looks like there's a problem
                    }
                }

actionPerformed检查用户选择的组合框中的哪个选项，然后将正确的img JLabel传递给goWebsite（）函数。

@Override
    public void actionPerformed(ActionEvent e)
    {
        String color1 = (String)combo1.getSelectedItem();
        // Possibly check if either color is 'null' here
        if (color1.equals("red") )
        {

            goWebsite(img1);
        }
        if (color1.equals("blue") )
        {

            goWebsite(img2);
        }
        if (color1.equals("green") )
        {

            goWebsite(img3);
        }
}

Answer 1

尝试向ItemListener添加JComboBox，在调用itemStateChanged时，检查ItemEvent#getStateChanged是否等于ItemEvent.SELECTED。

检查组合框中选择的内容（或使用ItemEvent#ItemSelected）并使用您想要的信息更新单个JLabel或使用{{使当前标签与所选项目相关联1}}，但也要确保隐藏其他人

例如......

JLabel#setVisible(true)

基于组合框选项显示JLabel

1 个答案: