往JFrame里面添加Jpanel出现java.lang.ClassCastException

add是Menu里的方法，Menu继承JFrame
我写了setLayout

public class Pro_Main extends JFrame{

private Container con;
private JMenuBar bar;
private JMenu systemMenu;
private JMenu infMenu;
private JMenu enterMenu;
private JMenu printMenu;

Pro_Main()
{
this.init();
}
public void init()
{

this.setSize(1000, 730);
systemMenu = new JMenu("系统消息");
infMenu = new JMenu("基本信息");
enterMenu = new JMenu("消费指数");
printMenu = new JMenu("各项费用报表");
con = getContentPane();
bar = new JMenuBar();
bar.add(systemMenu);
bar.add(infMenu);
bar.add(enterMenu);
bar.add(printMenu);

this.setJMenuBar(bar);

this.setBackground(Color.red);
this.setVisible(true);
this.setResizable(false);
this.setLocationRelativeTo(null);
this.setLayout(null);
JPanel jp = new Pro_BuildingInfo();
jp.setLayout(null);
this.add(jp);
}
public static void main(String[] args) {
try
    {
    BeautyEyeLNFHelper.frameBorderStyle = BeautyEyeLNFHelper.FrameBorderStyle.translucencyAppleLike;
        org.jb2011.lnf.beautyeye.BeautyEyeLNFHelper.launchBeautyEyeLNF();
        UIManager.put("RootPane.setupButtonVisible", false);
        BeautyEyeLNFHelper.translucencyAtFrameInactive = false;

    }
    catch(Exception e)
    {
        //TODO exception
     e.printStackTrace();
    }
    new Pro_Main();
}
}

public class Pro_BuildingInfo extends JPanel implements ActionListener{
private static final long serialVersionUID = -5742054911590333204L;
Object a[][];

private JTable table;
private String title[] = {"小区编号","小区名称","楼宇编号","楼宇层数","产权面积","楼宇高度","类型","状态"
};
private DefaultTableModel mm;
private ArrayList<Vector> listSum;
private Vector list;
private Pro_I_BuildingInfo proB;
private JButton queryButton;
private JPanel jps;
private JPanel jpb;
private JTextField option;
private JTextField jtpage;
private Page page;

private JButton addButton;
private JButton changeButton;
private JButton deleteButton;
private JButton renewButton;
private JButton updateButton;
private JButton NextButton;
private JButton PriorButton;
private JButton jumpButton;
private JScrollPane jsp;
private JLabel jlPageTotal;
private JLabel jlPageNow;

private JComboBox jcb1=null;

public Pro_BuildingInfo() {

listSum = new ArrayList<Vector>();
proB = new Pro_C_BuildInfo();
String options[]= {"小区编号","小区名称","楼宇编号","类型","状态","所有"};
jcb1=new JComboBox(options);
jtpage = new JTextField();
jpb = new JPanel();
setSize(600, 700);

option = new JTextField();
jcb1.addActionListener(this);

queryButton = new JButton("查询");
addButton = new JButton("添加");
changeButton = new JButton("修改");
deleteButton = new JButton("删除");
renewButton = new JButton("重置");
updateButton = new JButton("更新");
NextButton= new JButton("下一页");
PriorButton = new JButton("上一页");
jumpButton = new JButton("跳转");
jlPageNow = new JLabel();
jlPageTotal = new JLabel();

jpb.setLayout(null);

NextButton.setBounds(230, 10, 60, 30);
PriorButton.setBounds(293,10,60,30);
jtpage.setBounds(360,10,60,30);
jumpButton.setBounds(430, 10, 60, 30);
jlPageNow.setBounds(60, 10, 70, 30);
jlPageTotal.setBounds(140, 10, 70, 30);
addButton.setBounds(95, 100, 80, 30);
changeButton.setBounds(185, 100, 80, 30);
deleteButton.setBounds(275, 100, 80, 30);
renewButton.setBounds(365, 100, 80, 30);
addButton.setUI(new BEButtonUI().setNormalColor(BEButtonUI.NormalColor.green));
changeButton.setUI(new BEButtonUI().setNormalColor(BEButtonUI.NormalColor.green));
deleteButton.setUI(new BEButtonUI().setNormalColor(BEButtonUI.NormalColor.green));
renewButton.setUI(new BEButtonUI().setNormalColor(BEButtonUI.NormalColor.green));
addButton.addActionListener(this);
changeButton.addActionListener(this);
deleteButton.addActionListener(this);
renewButton.addActionListener(this);
NextButton.addActionListener(this);
PriorButton.addActionListener(this);
jumpButton.addActionListener(this);
jtpage.addActionListener(this);

jps = new JPanel();
jps.setLayout(null);
jpb.setBounds(0,450,600,150);
jcb1.setBounds(30, 4, 100, 30);
option.setBounds(140, 4, 230, 30);
queryButton.setUI(new BEButtonUI().setNormalColor(BEButtonUI.NormalColor.green));
queryButton.addActionListener(this);
queryButton.setBounds(450, 4, 80, 30);
add(queryButton);

option.addActionListener(this);
jps.add(option);
jps.add(jcb1);

jps.setBounds(0, 0, 600, 40);

jpb.add(addButton);
jpb.add(changeButton);
jpb.add(deleteButton);
jpb.add(renewButton);
jpb.add(updateButton);
jpb.add(NextButton);
jpb.add(jumpButton);
jpb.add(PriorButton);
jpb.add(jtpage);
jpb.add(jlPageNow);
jpb.add(jlPageTotal);
add(jpb);
setSize(600, 700);

a = new Object[30][8];


page = new Page();

    jsp = new JScrollPane(this.tableView(1));
    //jsp.add(this.tableView(1));
    jsp.setBounds(0, 40, 600,450);
add(jsp);
add(jps);
setLayout(null);
setVisible(true);
// TODO Auto-generated constructor stub
} @Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == NextButton)
{
page.setpageNo(page.getPageNo()+1);
this.tableView(3);

}
// TODO Auto-generated method stub

//System.out.println("22222222");

if(e.getSource() == PriorButton)
{
            page.setpageNo(page.getPageNo()-1);
            this.tableView(3);

}
if(e.getSource() == jumpButton)
{
int a = Integer.valueOf(jtpage.getText());
page.setpageNo(a);
this.tableView(3);

}
if(e.getSource() == addButton)
{
new Pro_AddBuilding(this);
}
if(e.getSource() == deleteButton)
{
int row = table.getSelectedRow();
String ID = (String)table.getValueAt(row, 0);

String BIB =  (String)table.getValueAt(row, 2);
proB.deleteBuildInfo(ID, BIB);
this.tableView(2);
}
if(e.getSource() == changeButton)
{
int row = table.getSelectedRow();
System.out.println(row);
if(row<0)
{
JOptionPane.showMessageDialog(null, "必须选中一列修改", "标题",JOptionPane.ERROR_MESSAGE);
}
else{
String ID = (String)table.getValueAt(row, 0);

String CID = ID;
String BIB =  (String)table.getValueAt(row, 2);
int FloorNum = Integer.valueOf( (String)table.getValueAt(row, 3));
double Area = Double.valueOf((String)table.getValueAt(row, 4));
double Height = Double.valueOf((String)table.getValueAt(row, 5));
String Type = (String)table.getValueAt(row, 6);
String Status = (String)table.getValueAt(row, 7);

new Pro_UpdateBuilding(CID, BIB, FloorNum, Area, Height, Type, Status,this);

}
}

if(e.getSource() == queryButton)
{
String options = option.getText();
if(jcb1.getSelectedIndex() == 0)
{
//System.out.println("CVVVVVVVVVVV");
listSum = proB.queryByCID(options);
this.tableView(2);
//{"小区编号","小区名称","楼宇编号","类型","状态"};
}
if(jcb1.getSelectedIndex() == 1)
{


listSum = proB.queryByComName(options);
this.tableView(2);

}
if(jcb1.getSelectedIndex() == 2)
{

listSum = proB.queryByBID(options);

this.tableView(2);
}
if(jcb1.getSelectedIndex() == 3)
{
System.out.println("LLLLLLLLLLL");
listSum = proB.queryByType(options);
this.tableView(2);
}
if(jcb1.getSelectedIndex() == 4)
{

listSum = proB.queryByStatus(options);
this.tableView(2);
}
if(jcb1.getSelectedIndex() == 5)
{

    listSum = proB.queryAllBypage(page.getBegin(), page.getPageSize());
this.tableView(3);
}
}
// TODO Auto-generated method stub

}

public JTable tableView(int flag)
{
if(flag == 1){
table = new JTable(10,4);
mm = new DefaultTableModel(title,0);

page.setLen(proB.getTotalCount());
     page.setPageSize(12);
    page.setpageNo(1);
    System.out.println(page.getBegin()+"SSSSSSSSS"+page.getPageNo());
    listSum = proB.queryAllBypage(page.getBegin(), page.getPageSize());
    jlPageTotal.setText("共有"+page.getPageCount()+"页");
jlPageNow.setText("现在是第"+page.getPageNo()+"页");
String[] b;
for(int i = 0;i<listSum.size();i++)
{

list =  listSum.get(i);
b =new String[list.size()];
//System.out.println(list.size()+"Vec");
for(int j = 0;j<list.size();j++)
{
     b[j] = (String) list.get(j);

}
mm.addRow(b);

}
table.setModel(mm);
validate();


   // System.out.println(page.getPageNo()+"SSS");
}

else if(flag == 2)
{
mm.fireTableDataChanged();
while(mm.getRowCount()>0){
mm.removeRow(mm.getRowCount()-1);
}
String[] b;
for(int i = 0;i<listSum.size();i++)
{

list =  listSum.get(i);
b =new String[list.size()];
//System.out.println(list.size()+"Vec");
for(int j = 0;j<list.size();j++)
{
     b[j] = (String) list.get(j);
     System.out.println(b[j]);

}
mm.addRow(b);

}
table.setModel(mm);
table.setCellSelectionEnabled(false);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
jsp.setViewportView(table);
NextButton.setVisible(false);
jumpButton.setVisible(false);
PriorButton.setVisible(false);
jtpage.setVisible(false);
jlPageNow.setVisible(false);
jlPageTotal.setVisible(false);

// JScrollPane jsp1;
// jsp1 = new JScrollPane(table);
validate();

}
else if(flag == 3)
{
mm.fireTableDataChanged();
while(mm.getRowCount()>0){
mm.removeRow(mm.getRowCount()-1);
}
page.setLen(proB.getTotalCount());
listSum = proB.queryAllBypage(page.getBegin(), page.getPageSize());
jlPageTotal.setText("共有"+page.getPageCount()+"页");
jlPageNow.setText("现在是第"+page.getPageNo()+"页");
String[] b;
for(int i = 0;i<listSum.size();i++)
{

list =  listSum.get(i);
b =new String[list.size()];
//System.out.println(list.size()+"Vec");
for(int j = 0;j<list.size();j++)
{
     b[j] = (String) list.get(j);

}
mm.addRow(b);

}
table.setModel(mm);
validate();
NextButton.setVisible(true);
jumpButton.setVisible(true);
PriorButton.setVisible(true);
jtpage.setVisible(true);
jlPageNow.setVisible(true);
jlPageTotal.setVisible(true);

}
//System.out.println(page.getBegin());

//System.out.println("QQQQQQQQ");
jlPageTotal.setText("共有"+page.getPageCount()+"页");
jlPageNow.setText("现在是第"+page.getPageNo()+"页");

TableColumn Column1 = table.getColumnModel().getColumn(6);
TableColumn Column2 = table.getColumnModel().getColumn(2);
TableColumn Column3 = table.getColumnModel().getColumn(3);
Column2.setPreferredWidth(55);
Column1.setPreferredWidth(40);
Column3.setPreferredWidth(55);
//System.out.println("SSSSSSSSSSSSSSSSSSS");
return table;

}}

楼主没事吧，layout设成null干嘛？

用setBounds绝对定位啊,没看到你的setBounds啊

首先你这个问题是事件调度线程产生的，不是 main线程产生的；其次，你这个错误异常提到了一个排序问题，也就是说你某个类用到了SortingFocusTraversalPolicy，可以检查下那个地方是否提供了Comparator的实现；
如果没有，你尝试Pro_BuildingInfo实现Comparable接口；

调试易

往JFrame里面添加Jpanel出现java.lang.ClassCastException

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