我不知道如何在JFrame中逐个显示我的对象列表(无论参数如何)。我想用循环来做它。我想在点击按钮等后显示前10个元素和接下来的10个元素。任何想法?
答案 0 :(得分:0)
我认为这对我不起作用...我已经在JList中添加了一个列表到JPanel,按钮点击后它会刷新,但是当我点击实际显示JList元素时它们会回到第一个一些 - 到开头...(repaint()命令被注释,因为有了它我没有看到我的JList的任何变化)。当remove()和revalidate()命令也被注释时,我有这些相同的效果......所以我不知道问题出在哪里......
public Window()
{
setTitle("Window");
setSize(600,600);
setResizable(false);
setLocationRelativeTo(null);
setLayout(new BorderLayout());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
JList<?> list = new JList<Object>(tmp_list.toArray());
listPanel = new JPanel();
listPanel.setLayout(new BorderLayout());
listPanel.add(new JScrollPane(list));
add(listPanel, BorderLayout.CENTER);
nextButton = new JButton("Next");
buttonsPanel = new JPanel();
buttonsPanel.setLayout(new FlowLayout());
buttonsPanel.add(nextButton);
add(buttonsPanel, BorderLayout.SOUTH);
nextButton.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
Object source = e.getSource();
if(source == nextButton)
{
if(current_page < last_page)
{
current_page++;
refreshListPanel();
}
}
}
private void refreshListPanel()
{
listPanel.removeAll();
tmp_list = showCurrentPage(N, cars1);
JList<?> list = new JList<Object>(tmp_list.toArray());
listPanel.add(new JScrollPane(list));
listPanel.revalidate();
listPanel.repaint();
}
private List<Car> showCurrentPage(int n, List<Car> main_list)
{
List<Car> list = new ArrayList<Car>();
int counter = n*(current_page);
int size;
if(current_page == last_page && C%N != 0)
size = main_list.size()%n;
else
size = n;
for(int i = 0; i < size; i++)
{
list.add(main_list.get(counter + i));
}
return list;
}