Java Swing:Can';t显示我的JPanel的几个实例
我正在做一个GUI,在使用JPanel时遇到了麻烦 首先是我的JPanel:Java Swing:Can';t显示我的JPanel的几个实例,java,swing,jpanel,Java,Swing,Jpanel,我正在做一个GUI,在使用JPanel时遇到了麻烦 首先是我的JPanel: public class ExperimentPanel extends JPanel{ private static File file1,file2=null; private static DefaultListModel model = new DefaultListModel(); private static JList list = new JList(model); private static
public class ExperimentPanel extends JPanel{
private static File file1,file2=null;
private static DefaultListModel model = new DefaultListModel();
private static JList list = new JList(model);
private static JPanel mainpanel = new JPanel();
private static JPanel leftpanel = new JPanel();
private static JPanel rightpanel = new JPanel();
private static JPanel twoFiles = new SelectTwoFiles();
private static JPanel folderOrFile = new SelectFolderOrFile();
private static JPanel foldersOrFiles = new SelectTwoFoldersOrFiles();
public ExperimentPanel(int selectID){
this.setBorder(new EmptyBorder(10, 10, 10, 10));
if(selectID==Constants.SelectTwoFiles){
this.add(twoFiles, BorderLayout.NORTH);
}
else if(selectID==Constants.SelectFolderOrFile){
this.add(folderOrFile, BorderLayout.NORTH);
}
else if(selectID==Constants.SelectTwoFoldersOrFiles){
this.add(foldersOrFiles,BorderLayout.NORTH);
}
JButton remove =new JButton("Remove Method");
JButton add = new JButton("Add Method");
JButton save = new JButton("Save list");
JButton load = new JButton("Load list");
leftpanel.add(new JScrollPane(list));
Box listOptions = Box.createVerticalBox();
listOptions.add(add);
listOptions.add(remove);
listOptions.add(save);
listOptions.add(load);
rightpanel.add(listOptions);
Box mainBox = Box.createHorizontalBox();
mainBox.add(leftpanel);
mainBox.add(rightpanel);
//mainBox.add(leftleft);
this.add(mainBox, BorderLayout.CENTER);
//start jobs
JButton start = new JButton("Launch experiment");
this.add(start,BorderLayout.PAGE_END);
start.addActionListener(launch);
add.addActionListener(adding);
remove.addActionListener(delete);
}
public static ActionListener launch = new ActionListener(){
public void actionPerformed(ActionEvent event){
//check the files
if((file1==null)||(file2==null)){
JOptionPane.showMessageDialog(null,
"A graph file is missing",
"Wrong files",
JOptionPane.ERROR_MESSAGE);
}
//checks the list
}
};
public static ActionListener delete = new ActionListener() {
public void actionPerformed(ActionEvent event) {
ListSelectionModel selmodel = list.getSelectionModel();
int index = selmodel.getMinSelectionIndex();
if (index >= 0)
model.remove(index);
}
};
public static ActionListener adding = new ActionListener(){
public void actionPerformed(ActionEvent event){
JComboBox combo = new JComboBox();
final JPanel cards = new JPanel(new CardLayout());
JPanel form = new JPanel();
JPanel methode1 = new JPanel();
methode1.add(new JLabel("meth1"));
methode1.setBackground(Color.BLUE);
methode1.setName("meth1");
JPanel methode2 = new JPanel();
methode2.add(new JLabel("meth2"));
methode2.setBackground(Color.GREEN);
methode1.setName("meth2");
combo.addItem("meth1");
combo.addItem("meth2");
cards.add(methode1,"meth1");
cards.add(methode2,"meth2");
JPanel control = new JPanel();
combo.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JComboBox jcb = (JComboBox) e.getSource();
CardLayout cl = (CardLayout) cards.getLayout();
cl.show(cards, jcb.getSelectedItem().toString());
}
});
control.add(combo);
form.add(cards, BorderLayout.CENTER);
form.add(control, BorderLayout.SOUTH);
JOptionPane.showMessageDialog(null,form,"Select a method",JOptionPane.PLAIN_MESSAGE);
}
};
}
问题是,如果我创建了该面板的多个实例,它们将不会像预期的那样显示
我试着在main中创建两个简单的JFrames,每个JFrames都有一个新的实验面板,这样问题就不是来自调用者了
它在一个JFrame调用一个experiementPanel时运行良好
以下是一次和两次通话的显示:
我如何称呼他们:
JFrame test = new JFrame();
test.add(new ExperimentPanel(3));
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
test.setLocation(dim.width/3 - test.getWidth()/3, dim.height/3 - test.getHeight()/3);
test.setSize(550,300);
test.setVisible(true);
JFrame test2 = new JFrame();
test2.add(new ExperimentPanel(3));
test2.setLocation(dim.width/3 - test.getWidth()/3, dim.height/3 - test.getHeight()/3);
test2.setSize(550,300);
test2.setVisible(true);
您可以创建一个面板类
ExperimentPanel
,它本身由几个组件组成,这些组件存储在ExperimentPanel
的类字段中
由于您将这些类字段声明为静态字段,因此它们只有一个实例。当您实例化几个ExperimentPanel
对象时,它们都希望共享这些字段,从而产生您看到的效果
因此,请从这些字段中删除静态修改器:
public class ExperimentPanel extends JPanel{
private File file1,file2=null;
private DefaultListModel model = new DefaultListModel();
private JList list = new JList(model);
private JPanel mainpanel = new JPanel();
private JPanel leftpanel = new JPanel();
...
您是否使用任何布局来组织您的gui?这里没有,我尝试使用cardLayout在面板之间切换,但问题仍然与我所想的相同,但忘记尝试,谢谢mvp。