java - 其他面板的背景图片问题

Question

所以我为纸牌游戏 war 创建了一个程序。一切都完成了，除了我想添加一个背景。问题是我不知道如何添加背景图片，以便其他 JLabels 和 JButtons 仍然出现在图片的顶部。有没有给我设置背景图片以便其他面板也显示在顶部？到目前为止，我的程序是这样的:

public War()
{
    JFrame frame = new JFrame();

    frame.setSize(500, 500);
    frame.setTitle("WAR");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new BorderLayout());

    //Set up for background image
    Background = new JPanel();
    Background.add(new Background("Background.png"));
    frame.add(Background);
    Background.setLayout(new OverlayLayout(Background));

    cardPanel = new JPanel (new GridLayout(2,1));
    ///create labels and init with card back
    String strCard1 = "cardback.png";
    String strCard2 = "cardback.png";
    lblPlayer1Card = new JLabel(new ImageIcon(strCard1));
    lblPlayer2Card = new JLabel(new ImageIcon(strCard2));
    cardPanel.add(lblPlayer1Card);
    cardPanel.add(lblPlayer2Card);

    //Create panels for when war is played
    warPanel = new JPanel (new GridLayout(2, 3));
    String emptycards = "blankcard.png";
    player1war1 = new JLabel(new ImageIcon(emptycards));
    player1war2 = new JLabel(new ImageIcon(emptycards));
    player1war3 = new JLabel(new ImageIcon(emptycards));
    player2war1 = new JLabel(new ImageIcon(emptycards));
    player2war2 = new JLabel(new ImageIcon(emptycards));
    player2war3 = new JLabel(new ImageIcon(emptycards));
    warPanel.add(player1war1);
    warPanel.add(player1war2);
    warPanel.add(player1war3);
    warPanel.add(player2war1);
    warPanel.add(player2war2);
    warPanel.add(player2war3);


    // Create a panel
    btnPanel = new JPanel(new GridLayout(2,2));
    //set up next card button
    JButton btnNext = new JButton("Next Card");
    NextListener listener1 = new NextListener();
    btnNext.addActionListener(listener1);
    //set up new game button
    JButton btnNewGame = new JButton("New Game");
    NewGameListener listener2 = new NewGameListener();
    btnNewGame.addActionListener(listener2);


    //Sets up new panel showing size of main pile and discard pile of both players
    statusPanel = new JPanel(new GridLayout(4,2));

    //status labels that show the size of piles
    status1 = new JLabel("");// Size of player 1's main pile
    status2 = new JLabel("");//Size of player 1's discard pile
    status3 = new JLabel("");//Size of player 2's main pile
    status4 = new JLabel("");//Size of player 2's discard pile
    statusWar = new JLabel("");//Status label that shows the winner of War
    statusEmpty1 = new JLabel(""); // Creates empty status to put space between War status and size statuses
    statusEmpty2 = new JLabel(""); // Creates empty status to put space between War status and size statuses

    statusBar = new JLabel("");

    //Adds the labels to the panels
    btnPanel.add(btnNext);
    btnPanel.add(btnNewGame);
    btnPanel.add(statusBar);
    statusPanel.add(status1);
    statusPanel.add(status2);
    statusPanel.add(status3);
    statusPanel.add(status4);
    statusPanel.add(statusEmpty1);
    statusPanel.add(statusEmpty2);
    statusPanel.add(statusWar);

    cardPanel.setOpaque(false);
    btnPanel.setOpaque(false);
    statusPanel.setOpaque(false);
    warPanel.setOpaque(false);

    //The layout of the frame
    Background.add(cardPanel, BorderLayout.WEST);
    Background.add(btnPanel, BorderLayout.SOUTH);
    Background.add(statusPanel, BorderLayout.NORTH);
    Background.add(warPanel, BorderLayout.EAST);

    frame.setVisible(true);
}

Answer 1

创建你自己 JLabel .加载图像并将其应用到标签 ( JLabel#setIcon )。

将标签布局管理器设置为您需要的。像往常一样将其他组件添加到标签中。

将标签添加到框架。

看看

Place JLabel on top of JLabel with image in

More than one JPanel in a Frame / having a brackground Image and another Layer with Components on the top

例如