JPanel具有16x16 GridLayout，显示有17列和空单元格

Question

在我的BoardPanel类中，我添加了一个具有16x16 GridLayout的JPanel。该JPanel是在createGridPanel()方法内部创建的，在那里我还用RotatableJLabel填充了网格的单元格，这是JLabel的子类，它仅支持旋转。现在，当我运行该应用程序时，网格将显示一个额外的列（17），最后一行的最后几个单元格为空。我一直在检查代码，但看不到我在做什么错。据我所知，我正在填补所有牢房。我在这里想念什么？

public class BoardPanel extends JLayeredPane {
// Constructor
    public BoardPanel() {
        setPreferredSize(new Dimension(650,700)); // set the size of the JLayeredPane
        // Create the necessary non-grid related components
        JLabel logo = createLogo();
        RedRectangularJLabel redHomeArea = new RedRectangularJLabel("Home",Color.red, Color.white,55,255);
        RedRectangularJLabel redStartArea = new RedRectangularJLabel("Start",Color.red,Color.white,150,44);
        YellowRectangularJLabel yellowHomeArea = new YellowRectangularJLabel("Home",Color.yellow,Color.white,495,360);
        YellowRectangularJLabel yellowStartArea = new YellowRectangularJLabel("Start", Color.yellow,Color.white,400,572);
        JPanel grid = createGridPanel();
        // Add the components to the layered pane
        add(grid,0);
        add(redHomeArea,1);
        add(redStartArea,1);
        add(yellowHomeArea,1);
        add(yellowStartArea,1);
        add(redPawn1,2);
        add(redPawn2,2);
        add(yellowPawn1,2);
        add(yellowPawn2,2);
        add(logo,3);
        // Move the non-grid components to the front of the layered pane to make them visible
        moveToFront(logo);
        moveToFront(redHomeArea);
        moveToFront(redStartArea);
        moveToFront(yellowHomeArea);
        moveToFront(yellowStartArea);
        moveToFront(redPawn1);
        moveToFront(redPawn2);
        moveToFront(yellowPawn1);
        moveToFront(yellowPawn2);
}

/**
 * Creates a JPanel with a 16x16 GridLayout
 * and populates its cells with the appropriate data.
 * @return The final JPanel with a populated 16x16 grid
 */
private JPanel createGridPanel() {
    JPanel panel = new JPanel(new GridLayout(16,16));
    panel.setPreferredSize(new Dimension(650,700));
    panel.setBounds(0,0,650,700);
    RotatableJLabel gridLabel;

    for(int i =0; i < 256; i++) {
        if(i == 5) gridLabel = new RotatableJLabel(blueSlideEnd,90);
        else gridLabel = new RotatableJLabel();
        panel.add(gridLabel,i);
    }
    return panel;
}
}

Answer 1

使用new GridLayout(0,16)代替new GridLayout(16,16)。

检查https://docs.oracle.com/javase/tutorial/uiswing/layout/grid.html了解更多详细信息。