我只能看到最后添加的JPanel。上一张似乎被上一张取代了。为什么是这样？这是我的代码。提前致谢。
...
class GUIController {
BaseFrame bf = new BaseFrame(); //is a JFrame
public void showFrame(final String frameName, final JPanel... panels){
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Class c;
Constructor ctr;
c = Class.forName("com.mytunes.client.views.frames." + frameName + "Frame");
ctr = c.getConstructor();
bf.removeAll();
bf = (BaseFrame) ctr.newInstance(); // no issue with getting the JFrame dynamically created!
for(JPanel panel:panels){
switch(i){
case 1: bf.getContentPane().add(panel,BorderLayout.PAGE_START);
break;
case 2:
bf.getContentPane().add(panel,BorderLayout.CENTER);
break;
case 3:
bf.getContentPane().add(panel,BorderLayout.PAGE_END);
break;
}
}
bf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
bf.pack();
bf.setVisible(true);
} catch (InstantiationException ex) {
Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalArgumentException ex) {
Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
} catch (InvocationTargetException ex) {
Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
} catch (NoSuchMethodException ex) {
Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
} catch (SecurityException ex) {
Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
} catch (ClassNotFoundException ex) {
Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
public void showEnterCard(String frame){
JPanel p1 = new JPanel();
JPanel p2 = new JPanel();
JPanel p3 = new JPanel();
showFrame(frame, p1,p2, p3);
}
}
class Main{
public static void main(String args[]){
GUIController c = new GUIController();
c.showEnterCard("FirstFrame");
}
}
编辑:(解决方案)
循环更改如下:
for(int i = 1; i <= panels.length; i++){
switch(i){
case 1:
bf.getContentPane().add(panels[0],BorderLayout.PAGE_START);
break;
...
}
}
最佳答案
你永远不会改变i，它始终是1，因此开关中的case 1:始终为true，并且JPanel始终为true添加到同一位置。
关于java - 仅显示事件调度线程中最后添加到 JFrame 的 JPanel，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7691942/