JButton "disappears" 尽管它位于 JLabel 之外的另一层

JButton "disappears" although it is on another Layer than JLabel

我最近在做一个类似国际象棋的棋盘游戏,所以我做了一个11*11的场地。在每个字段上应该有一个 JButton(在默认层上),并且在一个更高的层上有一个可移动的 JLabel。但是标签仍然将按钮推开。这是简化的代码:

public class Demo {

    public static void main(String[] args) {

        ImageIcon image = new ImageIcon("C:src\myImage.png");

        JFrame frame = new JFrame();

        JPanel mainPanel = new JPanel();

        JLayeredPane[] tileLayeredPane = new JLayeredPane[121];

        JButton button = new JButton();

        JLabel label = new JLabel();

        label.setIcon(image);

        button.setText("I am not visible!");

        for (int i = 0; i < tileLayeredPane.length; i++) { // creates 121 JLabels

            tileLayeredPane[i] = new JLayeredPane();

            tileLayeredPane[i].setLayout(new BoxLayout(tileLayeredPane[i], BoxLayout.Y_AXIS));
            tileLayeredPane[i].setOpaque(true);
        } 

        tileLayeredPane[0].add(button, JLayeredPane.DEFAULT_LAYER);
        tileLayeredPane[0].add(label, JLayeredPane.PALETTE_LAYER);

        mainPanel.setLayout(new GridLayout(11, 11));

        for(int i = 0; i < 121; i++) {

            mainPanel.add(tileLayeredPane[i]);
        }

        frame.add(mainPanel);
        frame.setVisible(true);
    }

}

On each field should be a JButton (on the default layer) and and on a higher layer that a movable JLabel

是的,因为您在 JLayeredPane 上使用了 BoxLayout,它决定了组件的布局方式 - JLayeredPane 只会影响组件的顺序是涂漆的,而不是它们的布局方式

我 "guessing" 你试图将标签放在按钮的顶部,这回避了 "why aren't you using the buttons inbuilt image support"?

的问题