JLabel图像阵列
我试图将相同的jlabel存储图像两次加载到gridlayout面板中,但是不是创建图像的两个实例,而是仅显示一次然后移动图像。
如何将件数组中的相同JLabel位置存储到boardLabels数组中的多个JLabel中。
谢谢 :)
public static JPanel boardPanel = new JPanel(new GridLayout(4, 0));public static JLabel pieces[] = new JLabel[2];private static JLabel[] boardLabels = new JLabel[4];public MainFrame() { pieces[0] = new JLabel(new ImageIcon(System.getProperty("user.dir") + "/images/piece1.png")); pieces[1] = new JLabel(new ImageIcon(System.getProperty("user.dir") + "/images/piece2.png")); this.add(boardPanel); displayGUIboard();}public static void displayGUIboard() { //ERROR - the label in pieces[0] is not copied into both boardLabels [0] and [1] boardLabels[0] = pieces[0]; boardLabels[1] = pieces[0]; boardPanel.add(boardLabels[0]); boardPanel.add(boardLabels[1]);}public static void main(String[] args) { MainFrame frame = new MainFrame(); frame.setVisible(true); frame.setSize(600, 600); frame.setLocationRelativeTo(null); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}
这有效
boardLabels[0] = new JLabel(pieces[1]); boardLabels[1] = new JLabel(pieces[1]);
当使用ImageIcons时,我想避免这种情况,因为要更新电路板,我必须删除然后重新加载JLabel。我更愿意只更新已加载的标签。
编辑 我之前尝试过这个但它抛出一个空指针异常...
boardLabels[0].setIcon(pieces[1]); boardLabels[1].setIcon(pieces[1]); boardPanel.add(boardLabels[0]); boardPanel.add(boardLabels[1]);
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