setLocation 不适用于扩展 JPanel 的类 [英] setLocation not working on class extending JPanel

问题描述

我有一个名为Player"的类，它扩展了 JPanel.该类具有属性 x 和 y (这可能是问题，但我无法弄清楚).当我运行下一个代码时，它将 JPanel 的位置设置为 (100, 100):

private void initGamePanel() {gamePanel.setBackground(Color.BLUE);gamePanel.setVisible(true);gamePanel.setLayout(null);JPanel jPanel = new JPanel();jPanel.setLocation(100, 100);jPanel.setSize(100, 100);jPanel.setBackground(Color.CYAN);gamePanel.add(玩家);}

但是当我对 "Player" 类做同样的事情时，位置保持在 (0, 0):

private void initGamePanel() {gamePanel.setBackground(Color.BLUE);gamePanel.setVisible(true);gamePanel.setLayout(null);玩家 = 新玩家();player.setLocation(100, 100);player.setSize(100, 100);player.setBackground(Color.CYAN);gamePanel.add(玩家);}

还有一件事:当我在构造函数中设置玩家的 x 和 y 时，位置等于这些值.

解决方案

该类具有属性 x 和 y(这可能是问题所在

可能是这样，特别是如果您有 getX() 和 getY() 方法，因为这些方法已经由 JPanel 实现，不应被覆盖.

不确定是否真的需要 x/y 属性，因为您可以直接设置组件的位置.

如果您出于其他原因需要这些属性，那么它们应该具有更具描述性的名称，以避免与类变量混淆.

I have a class named "Player" which extends JPanel. The class has the attributes x and y (which might be the problem but I can't figure it out). When I run the next code it sets the location of the JPanel to (100, 100):

private void initGamePanel() {
    gamePanel.setBackground(Color.BLUE);
    gamePanel.setVisible(true);
    gamePanel.setLayout(null);

    JPanel jPanel = new JPanel();
    jPanel.setLocation(100, 100);
    jPanel.setSize(100, 100);
    jPanel.setBackground(Color.CYAN);

    gamePanel.add(player);
}

But when I do the same with the "Player" class, the position stays at (0, 0):

private void initGamePanel() {
    gamePanel.setBackground(Color.BLUE);
    gamePanel.setVisible(true);
    gamePanel.setLayout(null);

    player = new Player();
    player.setLocation(100, 100);
    player.setSize(100, 100);
    player.setBackground(Color.CYAN);

    gamePanel.add(player);
}

And another thing: when I set the x and y of player in the constructor, the position is equal to those values.

解决方案

The class has the attributes x and y (which might be the problem

It could be, especially if you have getX() and getY() methods, since these are already implemented by a JPanel and should not be overridden.

Not sure if you really need the x/y attributes since you can just set the location of the component directly.

If you need these attributes for another reason then they should have a more descriptive name to avoid confusion with the class variables.

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