java CardLayout 获取所选卡片的名称
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CardLayout get the selected card's name
提问by wotan2009
How can I get the string identifier of the selected panel in card layout.
如何在卡片布局中获取所选面板的字符串标识符。
回答by Fortega
The CardLayout does not know what the currently selected panel is. You should keep this in memory yourself, when calling the show() method.
CardLayout 不知道当前选择的面板是什么。在调用 show() 方法时，您应该自己将其保存在内存中。
回答by Pieter-Jan Van Robays
The CardLayout does not allow you to do this. However, you should be able to access the top panel of the CardLayout.
CardLayout 不允许您这样做。但是，您应该能够访问 CardLayout 的顶部面板。
So a little work around is to give each added panel a name, equal to the string identifier. That way you can get the top card, and get it's name. This is how you do it:
因此，一些解决方法是为每个添加的面板指定一个名称，该名称等于字符串标识符。这样你就可以得到顶牌，并得到它的名字。这是你如何做到的：
final String CARD1 = "Card 1";
final String CARD2 = "Card 2";
JPanel panel = new JPanel(new CardLayout());
JPanel card1 = new JPanel();
card1.setName(CARD1);
JPanel card2 = new JPanel();
card2.setName(CARD2);
panel.add(card1);
panel.add(card2);
//now we want to get the String identifier of the top card:
JPanel card = null;
for (Component comp : panel.getComponents()) {
if (comp.isVisible() == true) {
card = (JPanel) comp;
}
}
System.out.println(card.getName());
