检测JLabel中的哪个图像

Question

我有一个JLabel和两个Jbutton，名为booking和next。当点击下一个按钮时，将显示另一个图像。

next.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
        if (i >= 8) {
            i = 1;
        } else {
            i++;
        }
        i2 = new ImageIcon(this.getClass().getClassLoader().getResource("image/" + i + ".jpg"));
        img.setIcon(i2);
    }
});

假设图像2显示在JLabel img中。点击预订按钮，它将转到预订gui。如何知道选择了哪个图像，以便它可以分别进入课堂？

Answer 1

尝试以下

    //private member used throughout the class
    private int i;
    i = 1;

    next.addActionListener(new ActionListener() {
                        public void actionPerformed(ActionEvent e) {
                            if (i >= 8) {
                                i = 1;
                            } else {
                                i++;
                            }
                            i2 = new ImageIcon(this.getClass().getClassLoader().getResource("image/" + i + ".jpg"));
                            img.setIcon(i2);
                        }
                    });
                }

    //call test() to get the value
    private void test()
    {
                    //Your 'i' variable will have been initialised by the listener method above
                    switch( i )
                    {
                       case 1:
                       //add your code here
                       break;
                       case 2:
                       break;
                       case 3:
                       break;
                       default:
                       break;
                    }
    }