问题描述
我需要使用 JButton 在多个面板之间切换,第一个面板工作正常,但是按钮无法切换到其他面板。这是 cardlayout 的主类和使用 cardlayout.next( );。我不确定接下来要做什么。
public class MainPanel{
/**
* @param args the command line arguments
*/
private static JFrame frame;
private static JButton button;
private static JPanel cards;
private static int panelChanger = 0;
public static void main(String args[]){
frame = new JFrame ("Draw");
frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
LinearPanel panel = new LinearPanel();
frame.getContentPane().add(panel);
CirclePanel panel2 = new CirclePanel();
frame.getContentPane().add(panel2);
AbsPanel panel3 = new AbsPanel();
frame.getContentPane().add(panel3);
JPanel cards = new JPanel(new cardlayout());
cards.add(panel,"LinearPanel");
cards.add(panel2,"CirclePanel");
cards.add(panel3,"AbsPanel");
button = new JButton("Next");
button.setForeground(Color.white);
button.setBounds(250,10,100,60);
button.addActionListener( new ButtonListener());
frame.add(button);
frame.getContentPane().add(cards);
frame.pack();
frame.setVisible(true);
int a = 0;
cardlayout cardlayout = (cardlayout) cards.getLayout();
}
static class ButtonListener implements ActionListener{
public void actionPerformed (ActionEvent event){
if(event.getSource() == button){
cardlayout cardlayout = (cardlayout) cards.getLayout();
cardlayout.next(cards);
frame.revalidate();
}
}
}
}
解决方法
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